Pub Date : 2020-01-01DOI: 10.15406/MSEIJ.2020.04.00129
E. Gómez-Pachón, Y. T. Pérez
which, due to its inconvenient final disposition, produce great pollution problems in rivers, land and air. The inadequate selection of materials in the design process in regard to the final disposition of the products has been the cause of unimaginable environmental impacts. There are many examples of this situation. For example: the inexpensive polyethylene plastic bags are used only while transporting purchased products, then, they end up in the garbage or on the street and take between 150 and 300 years to degrade, generating contamination of water beds, rivers, oceans and soil. Another example is found in children’s toys made of polyethylene, polypropylene, among others, which are usually used for a few months and then, when they break, fail or stop being used, they also end up in the trash, requiring around 200 years or more to degrade (Figure1), causing the same polluting effect of the previous case. The situation stated above, should be scaled globally, given that these phenomena of polluting materials in nature are closely related to the rate of population growth, thereby increasing the consumption of products that have been called “singleuse”.
{"title":"Management of agroindustrial waste for the development of polymeric micro and nanomaterials","authors":"E. Gómez-Pachón, Y. T. Pérez","doi":"10.15406/MSEIJ.2020.04.00129","DOIUrl":"https://doi.org/10.15406/MSEIJ.2020.04.00129","url":null,"abstract":"which, due to its inconvenient final disposition, produce great pollution problems in rivers, land and air. The inadequate selection of materials in the design process in regard to the final disposition of the products has been the cause of unimaginable environmental impacts. There are many examples of this situation. For example: the inexpensive polyethylene plastic bags are used only while transporting purchased products, then, they end up in the garbage or on the street and take between 150 and 300 years to degrade, generating contamination of water beds, rivers, oceans and soil. Another example is found in children’s toys made of polyethylene, polypropylene, among others, which are usually used for a few months and then, when they break, fail or stop being used, they also end up in the trash, requiring around 200 years or more to degrade (Figure1), causing the same polluting effect of the previous case. The situation stated above, should be scaled globally, given that these phenomena of polluting materials in nature are closely related to the rate of population growth, thereby increasing the consumption of products that have been called “singleuse”.","PeriodicalId":18241,"journal":{"name":"Material Science & Engineering International Journal","volume":"46 1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80006459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.15406/MSEIJ.2020.04.00135
A. Grozdanov, Iva Dimitrievska, P. Paunović, A. Petrovski
This paper reported the results of application of screen printed electrodes (SPE) based on polymer/carbon nanostructures (multi wall carbon nanotubes – MWCNT and grapheme – G) for gas sensors. Commercial SPEs were modified by polymers such as conductive polymer Poly Vinylidene Fluorid – PVDF and biocompatible Poly Ethylene Glycol – PEG. Modified SPEs were tested in ammonia vapors with different concentration: 3, 6.2, 12.5 and 25% (wt.). Sensor-testing was performed by monitoring the change in the electrical resistance of the electrodes. The physical characterization of the sensing electrodes was performed by Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) in ATR mode. The surface morphology of CNT/PEG and CNT/ PVDF modifications, after coating with 25% NH3, expressed the effects of ammonia on the surface of the nanocomposite layer. The ammonia solution acts aggressively on the modified surface, causing furrows to form in the uniform structure and very small nanorods of oxides.
{"title":"Screen printed electrodes based on polymer/MWCNT and polymer/G nanocomposite for advanced gas sensing application","authors":"A. Grozdanov, Iva Dimitrievska, P. Paunović, A. Petrovski","doi":"10.15406/MSEIJ.2020.04.00135","DOIUrl":"https://doi.org/10.15406/MSEIJ.2020.04.00135","url":null,"abstract":"This paper reported the results of application of screen printed electrodes (SPE) based on polymer/carbon nanostructures (multi wall carbon nanotubes – MWCNT and grapheme – G) for gas sensors. Commercial SPEs were modified by polymers such as conductive polymer Poly Vinylidene Fluorid – PVDF and biocompatible Poly Ethylene Glycol – PEG. Modified SPEs were tested in ammonia vapors with different concentration: 3, 6.2, 12.5 and 25% (wt.). Sensor-testing was performed by monitoring the change in the electrical resistance of the electrodes. The physical characterization of the sensing electrodes was performed by Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) in ATR mode. The surface morphology of CNT/PEG and CNT/ PVDF modifications, after coating with 25% NH3, expressed the effects of ammonia on the surface of the nanocomposite layer. The ammonia solution acts aggressively on the modified surface, causing furrows to form in the uniform structure and very small nanorods of oxides.","PeriodicalId":18241,"journal":{"name":"Material Science & Engineering International Journal","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75168451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.15406/MSEIJ.2020.04.00139
Ravindra Nm
Optical properties of semiconductors play a critical role in various applications including the design and manufacture of optical components, devices & sources, energy conversion and process monitoring & control. While the fundamental understanding of the optical properties of semiconductors has grown over the years, reliable data of the optical constants of semiconductors, particularly in the infrared range of wavelengths, is severely lacking in the literature. In this overview, detailed case studies of the optical properties of Silicon on Insulator (SOI) and Ge photodetectors, based on Forouhi-Bloomer dispersion equation, as function of photon energy (or wavelength) and thickness are presented. The obtained simulation results, based on this relation, are in good accord with the literature values and are consistent with some well-accepted studies. Furthermore, the results reported in this analysis are helpful for the determination and realization of the optical response of materials under conditions of varying photon energy and thickness.
{"title":"Simulation of optical properties of semiconductor multilayers from extreme ultraviolet to far infrared","authors":"Ravindra Nm","doi":"10.15406/MSEIJ.2020.04.00139","DOIUrl":"https://doi.org/10.15406/MSEIJ.2020.04.00139","url":null,"abstract":"Optical properties of semiconductors play a critical role in various applications including the design and manufacture of optical components, devices & sources, energy conversion and process monitoring & control. While the fundamental understanding of the optical properties of semiconductors has grown over the years, reliable data of the optical constants of semiconductors, particularly in the infrared range of wavelengths, is severely lacking in the literature. In this overview, detailed case studies of the optical properties of Silicon on Insulator (SOI) and Ge photodetectors, based on Forouhi-Bloomer dispersion equation, as function of photon energy (or wavelength) and thickness are presented. The obtained simulation results, based on this relation, are in good accord with the literature values and are consistent with some well-accepted studies. Furthermore, the results reported in this analysis are helpful for the determination and realization of the optical response of materials under conditions of varying photon energy and thickness.","PeriodicalId":18241,"journal":{"name":"Material Science & Engineering International Journal","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85206061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.15406/MSEIJ.2020.04.00143
H. Rönnqvist, R. Girard, J. Lundin, P. Viklander
Abbreviations: F0.063, fines content (<0.063mm) (%); F, mass passing (%); Ø, angle of inclined plane of segregation test setup (deg); αrep, angle of repose (deg); Dx, grain size at x % mass passing (mm); D15C, coarse sample at 15 % passing in segregation test (mm); D15F, fine sample at 15% passing in segregation test (mm); SR=D15C/ D15F, segregation ratio indicating segregation if >1 (...); W, water content (%); wopt, optimum water content (%); ρs, particle density (g/cm3); ρdry,max, maximum dry density (g/cm 3); Cu, coefficient of uniformity (Cu=D60/D10) (...) Nomenclature: fines amount, by weight, of soil finer than 0.063mm (European Standard) (%).
{"title":"The segregation of a sand-gravel dam filter of crushed rock and the influence of water content","authors":"H. Rönnqvist, R. Girard, J. Lundin, P. Viklander","doi":"10.15406/MSEIJ.2020.04.00143","DOIUrl":"https://doi.org/10.15406/MSEIJ.2020.04.00143","url":null,"abstract":"Abbreviations: F0.063, fines content (<0.063mm) (%); F, mass passing (%); Ø, angle of inclined plane of segregation test setup (deg); αrep, angle of repose (deg); Dx, grain size at x % mass passing (mm); D15C, coarse sample at 15 % passing in segregation test (mm); D15F, fine sample at 15% passing in segregation test (mm); SR=D15C/ D15F, segregation ratio indicating segregation if >1 (...); W, water content (%); wopt, optimum water content (%); ρs, particle density (g/cm3); ρdry,max, maximum dry density (g/cm 3); Cu, coefficient of uniformity (Cu=D60/D10) (...) Nomenclature: fines amount, by weight, of soil finer than 0.063mm (European Standard) (%).","PeriodicalId":18241,"journal":{"name":"Material Science & Engineering International Journal","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80809111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.15406/MSEIJ.2020.04.00145
Gunel Huseynova
improvement of the electrical behavior of organic semiconductors (OSCs) as high temperature causes lattice vibrations and provides required thermal energy for the system to create favourable environments for the release of the trapped charge carriers.1−3 The charge transport mechanism of inorganic semiconductors is sensitive to temperature as well. However, it is extremely detrimental to the performance of these materials as the temperature-induced lattice vibrations of the highly-ordered and crystalline inorganic substances lead to increased lattice scattering and trapping of the charges as well as reduced carrier mobility.4
{"title":"Inorganic versus organic semiconductors","authors":"Gunel Huseynova","doi":"10.15406/MSEIJ.2020.04.00145","DOIUrl":"https://doi.org/10.15406/MSEIJ.2020.04.00145","url":null,"abstract":"improvement of the electrical behavior of organic semiconductors (OSCs) as high temperature causes lattice vibrations and provides required thermal energy for the system to create favourable environments for the release of the trapped charge carriers.1−3 The charge transport mechanism of inorganic semiconductors is sensitive to temperature as well. However, it is extremely detrimental to the performance of these materials as the temperature-induced lattice vibrations of the highly-ordered and crystalline inorganic substances lead to increased lattice scattering and trapping of the charges as well as reduced carrier mobility.4","PeriodicalId":18241,"journal":{"name":"Material Science & Engineering International Journal","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72830151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.15406/MSEIJ.2020.04.00121
Goltsova Mv, Zhirov Gi, G. Tolmacheva
The Pd-H system is a unique one. High hydrogen permeation in palladium allows to use palladium like a membrane material to extra pure hydrogen gas production, as catalyzer for hydrogen penetration promotion in different metals, etc. For aims of hydrogen energy development, in which different types of Me-H systems are applied, most important feature of Pd-H system is in the fact that it is a classic system for hydrogen-metal interaction modelling. Really, all the Me-H systems have rather complicated equilibrium diagrams, and just thermodynamically opened Pd-H has a simple one,1 which looks like binary state cupola in coordinates T,oC, P, MPa, n(H/Pd). Despite the fact that Pd-H is under investigations for almost 200 years, this system is still full of surprises for researchers.1 The simplicity of Pd-H diagram is as follows. Under conditions corresponding to the left of the binary state cupola region (Figure 1), there is a dilute solid solution of hydrogen in palladium which is named α-phase. To the right of the cupola there is a saturated solid solution of hydrogen in palladium, (denoted as βphase, rarely α’-phase). If the figurative point of the sample crosses the two-phase region, a hydride transformation develops in the sample. Hydride transformation products cannot be detected by etching, so their morphology is studied by investigating the development of surface relief on a pre-polished metallographic cross-section in an optical microscope in oblique lighting.2 It was discovered3 that during both α→β and βα hydride transformations, the previously polished metallographic section is irreversibly deformed. As a result of hydride phase transformations, metals and alloys strongly harden and all their physical properties change. This phenomenon was called “hydrogen phase hardening” (HPN).4 If, however, the palladium sample is hydrogenated up to β-hydride state by the way “out” of the two-phase cupola, i.e. by such a way that the figurative point of the sample does not intersect the twophase region, then the hydride transformation does not develop and the metallographic cross-section remains generally unchanged.2 As there were no phase transformations2 proceeding by the way “out” of the cupola, the sample saves its preliminary annealed structure, and has β-phase through all its volume. So samples hydrogenated by the technique ‘out’ of the binary state cupola we name β-hydrides of palladium (β-PdHx). Mechanical properties are one of main features characterizing materials in general and metal-hydrogen alloys particularly. Classic techniques on mechanical properties study used by specialists were always tensile tests, hardness measurements and so on. After the pioneer work of Oliver and Farr on nanoindentation was published,5 through decades the nanoindentation technique became a tool for the measurement of mechanical properties at small scales and even can have greater importance in science as a technique for experimental studies of materials physics f
{"title":"Nanoindentation of palladium β- hydride","authors":"Goltsova Mv, Zhirov Gi, G. Tolmacheva","doi":"10.15406/MSEIJ.2020.04.00121","DOIUrl":"https://doi.org/10.15406/MSEIJ.2020.04.00121","url":null,"abstract":"The Pd-H system is a unique one. High hydrogen permeation in palladium allows to use palladium like a membrane material to extra pure hydrogen gas production, as catalyzer for hydrogen penetration promotion in different metals, etc. For aims of hydrogen energy development, in which different types of Me-H systems are applied, most important feature of Pd-H system is in the fact that it is a classic system for hydrogen-metal interaction modelling. Really, all the Me-H systems have rather complicated equilibrium diagrams, and just thermodynamically opened Pd-H has a simple one,1 which looks like binary state cupola in coordinates T,oC, P, MPa, n(H/Pd). Despite the fact that Pd-H is under investigations for almost 200 years, this system is still full of surprises for researchers.1 The simplicity of Pd-H diagram is as follows. Under conditions corresponding to the left of the binary state cupola region (Figure 1), there is a dilute solid solution of hydrogen in palladium which is named α-phase. To the right of the cupola there is a saturated solid solution of hydrogen in palladium, (denoted as βphase, rarely α’-phase). If the figurative point of the sample crosses the two-phase region, a hydride transformation develops in the sample. Hydride transformation products cannot be detected by etching, so their morphology is studied by investigating the development of surface relief on a pre-polished metallographic cross-section in an optical microscope in oblique lighting.2 It was discovered3 that during both α→β and βα hydride transformations, the previously polished metallographic section is irreversibly deformed. As a result of hydride phase transformations, metals and alloys strongly harden and all their physical properties change. This phenomenon was called “hydrogen phase hardening” (HPN).4 If, however, the palladium sample is hydrogenated up to β-hydride state by the way “out” of the two-phase cupola, i.e. by such a way that the figurative point of the sample does not intersect the twophase region, then the hydride transformation does not develop and the metallographic cross-section remains generally unchanged.2 As there were no phase transformations2 proceeding by the way “out” of the cupola, the sample saves its preliminary annealed structure, and has β-phase through all its volume. So samples hydrogenated by the technique ‘out’ of the binary state cupola we name β-hydrides of palladium (β-PdHx). Mechanical properties are one of main features characterizing materials in general and metal-hydrogen alloys particularly. Classic techniques on mechanical properties study used by specialists were always tensile tests, hardness measurements and so on. After the pioneer work of Oliver and Farr on nanoindentation was published,5 through decades the nanoindentation technique became a tool for the measurement of mechanical properties at small scales and even can have greater importance in science as a technique for experimental studies of materials physics f","PeriodicalId":18241,"journal":{"name":"Material Science & Engineering International Journal","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82820209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.15406/MSEIJ.2020.04.00134
Gunel Huseynova
The usage of organic dyes for organic electronics is expanding towards a wide range of applications and the results and experiences of the recent studies are being shared internationally. Due to specific features of some organic dyes, such as their ionic charge, they have received huge attention as dopants for organic materials. In this mini review, n-type doping properties of an organic salt, Pyronin B which is a well-known cationic dye, will be discussed. This dye has been demonstrated as a promising n-type dopant for organic conductors in its reduced state. In addition, Pyronin B is among relatively non-toxic and low-cost compounds. Furthermore, this molecule can also be solution-processed at room temperature which makes it extremely suitable for low cost and flexible electronic devices.
{"title":"Mini-review: reduced pyronin B as an N-type dopant for organic electronics","authors":"Gunel Huseynova","doi":"10.15406/MSEIJ.2020.04.00134","DOIUrl":"https://doi.org/10.15406/MSEIJ.2020.04.00134","url":null,"abstract":"The usage of organic dyes for organic electronics is expanding towards a wide range of applications and the results and experiences of the recent studies are being shared internationally. Due to specific features of some organic dyes, such as their ionic charge, they have received huge attention as dopants for organic materials. In this mini review, n-type doping properties of an organic salt, Pyronin B which is a well-known cationic dye, will be discussed. This dye has been demonstrated as a promising n-type dopant for organic conductors in its reduced state. In addition, Pyronin B is among relatively non-toxic and low-cost compounds. Furthermore, this molecule can also be solution-processed at room temperature which makes it extremely suitable for low cost and flexible electronic devices.","PeriodicalId":18241,"journal":{"name":"Material Science & Engineering International Journal","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90472249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-28DOI: 10.15406/MSEIJ.2019.03.00090
H. Dorozinska, G. Dorozinsky, V. Maslov, N. Kachur
Ultraviolet adhesives are widely used in the manufacture of precision optical devices. It is known, that adding fillers to the glue reduces shrinkage after polymerization, reduces internal stresses, improves the reliability of the connection, and also allows you to control the optical properties of the connecting layer. By varying the amount and composition of the filler, we can change the refractive index of the compound, as well as improve the processability of the compound due to faster polymerization. The kinetics of polymerization studied on surface plasmon resonance device "Plasmon". We used UV-spectroscopy an fluorescence spectroscopy for investigation glue`s properties. Dependences of the reflection coefficient R on the angle of incidence of laser radiation onto the samples with non-polymerized and polymerized adhesives are measured. The kinetics of polymerization process was determinate. Measurements of the absorption coefficients inherent to the structures glass – adhesive – glass within the range 200…400 nm was performed. The spectra of fluorescence inherent to the structures glass – adhesive – glass within the range 400…700 nm are measured. The obtained results show that the SPR method is informative and can be applied for investigations and optimization of UV-adhesive composition. Introduction of organosilicon acrylates with high dispersion as impurities in these adhesives enables to increase the velocity of adhesive polymerization.
{"title":"The use surface plasmon resonance to determine the optical parameters of UV-adhesive and control polymerization process","authors":"H. Dorozinska, G. Dorozinsky, V. Maslov, N. Kachur","doi":"10.15406/MSEIJ.2019.03.00090","DOIUrl":"https://doi.org/10.15406/MSEIJ.2019.03.00090","url":null,"abstract":"Ultraviolet adhesives are widely used in the manufacture of precision optical devices. It is known, that adding fillers to the glue reduces shrinkage after polymerization, reduces internal stresses, improves the reliability of the connection, and also allows you to control the optical properties of the connecting layer. By varying the amount and composition of the filler, we can change the refractive index of the compound, as well as improve the processability of the compound due to faster polymerization. The kinetics of polymerization studied on surface plasmon resonance device \"Plasmon\". We used UV-spectroscopy an fluorescence spectroscopy for investigation glue`s properties. Dependences of the reflection coefficient R on the angle of incidence of laser radiation onto the samples with non-polymerized and polymerized adhesives are measured. The kinetics of polymerization process was determinate. Measurements of the absorption coefficients inherent to the structures glass – adhesive – glass within the range 200…400 nm was performed. The spectra of fluorescence inherent to the structures glass – adhesive – glass within the range 400…700 nm are measured. The obtained results show that the SPR method is informative and can be applied for investigations and optimization of UV-adhesive composition. Introduction of organosilicon acrylates with high dispersion as impurities in these adhesives enables to increase the velocity of adhesive polymerization.","PeriodicalId":18241,"journal":{"name":"Material Science & Engineering International Journal","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75700089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.15406/mseij.2019.03.00092
Jinwu Kang, Xiang Wang, Chengyang Deng, Yunlong Feng, T. Feng, Y Jihao, Pengyue Wu
Selective laser melting (SLM) is one of promising additive manufacturing methods, especially for precision parts. It can produce complicated three-dimensional shapes in a layer by-layer style. It has been mainly applied into titanium alloys, nickel alloys and steels.1–3 Tin bronze is widely used as bearing materials for its good friction and wear behaviors. Powders metallurgy (PM), and mechanical ball milling (MBM), and casting are usually used for CuSn10 powder sintering.4–8 The porosity and geometry precision are the most concern problems. Additive manufacturing provides a new way to make tin bronze parts. However, the physical properties of copper are different from titanium, nickel alloys and steels, therefore, it is necessary to investigate the principles of selective laser sintering of tin bronze powder. The main parameters of SLM are laser power, scanning speed, layer thickness and hatch distance. Scudino et al.,9 achieved far better mechanical properties of CuSn10 specimens by SLM corresponding to as-cast properties. Deng et al.,10 studied the effect of laser energy density on the microstructure, mechanical properties of Tin bronze parts by SLM and found the laser energy density is the main factor for porosity formation and the mechanical properties. In this paper, The SLM of tin bronze (CuSn10) powder was performed with same laser energy density to investigate the effect of scanning speed and hatch distance on microstructure and mechanical properties.
{"title":"Effect of hatch distance on CuSn10 specimens by selective laser melting","authors":"Jinwu Kang, Xiang Wang, Chengyang Deng, Yunlong Feng, T. Feng, Y Jihao, Pengyue Wu","doi":"10.15406/mseij.2019.03.00092","DOIUrl":"https://doi.org/10.15406/mseij.2019.03.00092","url":null,"abstract":"Selective laser melting (SLM) is one of promising additive manufacturing methods, especially for precision parts. It can produce complicated three-dimensional shapes in a layer by-layer style. It has been mainly applied into titanium alloys, nickel alloys and steels.1–3 Tin bronze is widely used as bearing materials for its good friction and wear behaviors. Powders metallurgy (PM), and mechanical ball milling (MBM), and casting are usually used for CuSn10 powder sintering.4–8 The porosity and geometry precision are the most concern problems. Additive manufacturing provides a new way to make tin bronze parts. However, the physical properties of copper are different from titanium, nickel alloys and steels, therefore, it is necessary to investigate the principles of selective laser sintering of tin bronze powder. The main parameters of SLM are laser power, scanning speed, layer thickness and hatch distance. Scudino et al.,9 achieved far better mechanical properties of CuSn10 specimens by SLM corresponding to as-cast properties. Deng et al.,10 studied the effect of laser energy density on the microstructure, mechanical properties of Tin bronze parts by SLM and found the laser energy density is the main factor for porosity formation and the mechanical properties. In this paper, The SLM of tin bronze (CuSn10) powder was performed with same laser energy density to investigate the effect of scanning speed and hatch distance on microstructure and mechanical properties.","PeriodicalId":18241,"journal":{"name":"Material Science & Engineering International Journal","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79764308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.15406/mseij.2019.03.00081
Alini Luísa Diehl Camacho
separated or, when this first attempt is not assertive, these wastes can be used for development of new products, also known in the academy as co-products. These co-products are produced with the use of wastes with specific potentials. In this respect, the characterization of these materials through advanced techniques allows the knowledge of physical, chemical, thermal, structural, etc. properties. In the industry are generated several types of waste in its production cycle such as ferrous, non-ferrous, metallic materials, ceramic materials, biomass, etc. Knowing the production process to which a given waste is generated, it is possible to optimize the production to decrease its generation and / or to know exactly that material / residue in such a way as to apply it in a given process in the future. This knowledge generates added value. Then, the valorization of these residues and their use in the production of new materials widens the knowledge be it in the analysis of the life cycle of that material used initially until the end of its life, in the form of residue. Of course, there is a need for advanced materials processing which involves technology to the point of developing new advanced materials with specific characteristics: bioengineering applications, composites, functional materials, environmental materials, etc. There are several types of materials generated from the production processes and depending on their characteristics they have properties which may be superior when compared to the materials originally used in a conventional industrial process. For example, adding a specific percentage of a study material to a metal alloy can greatly improve its mechanical properties. Faced with this, it is important to consider that natural resources are scarce and in many cases, are no longer so easily found in nature. The environmental impact caused mainly when one thinks of ore extraction is enormous, when evaluated from the outset. We, as researchers and doctors of knowledge, need to see the productive processes with greater attention mainly what to do with the waste generated. Awareness and responsibility is the legacy that must be given to future generations so that the world becomes equal for all.
{"title":"The importance of characterization of materials","authors":"Alini Luísa Diehl Camacho","doi":"10.15406/mseij.2019.03.00081","DOIUrl":"https://doi.org/10.15406/mseij.2019.03.00081","url":null,"abstract":"separated or, when this first attempt is not assertive, these wastes can be used for development of new products, also known in the academy as co-products. These co-products are produced with the use of wastes with specific potentials. In this respect, the characterization of these materials through advanced techniques allows the knowledge of physical, chemical, thermal, structural, etc. properties. In the industry are generated several types of waste in its production cycle such as ferrous, non-ferrous, metallic materials, ceramic materials, biomass, etc. Knowing the production process to which a given waste is generated, it is possible to optimize the production to decrease its generation and / or to know exactly that material / residue in such a way as to apply it in a given process in the future. This knowledge generates added value. Then, the valorization of these residues and their use in the production of new materials widens the knowledge be it in the analysis of the life cycle of that material used initially until the end of its life, in the form of residue. Of course, there is a need for advanced materials processing which involves technology to the point of developing new advanced materials with specific characteristics: bioengineering applications, composites, functional materials, environmental materials, etc. There are several types of materials generated from the production processes and depending on their characteristics they have properties which may be superior when compared to the materials originally used in a conventional industrial process. For example, adding a specific percentage of a study material to a metal alloy can greatly improve its mechanical properties. Faced with this, it is important to consider that natural resources are scarce and in many cases, are no longer so easily found in nature. The environmental impact caused mainly when one thinks of ore extraction is enormous, when evaluated from the outset. We, as researchers and doctors of knowledge, need to see the productive processes with greater attention mainly what to do with the waste generated. Awareness and responsibility is the legacy that must be given to future generations so that the world becomes equal for all.","PeriodicalId":18241,"journal":{"name":"Material Science & Engineering International Journal","volume":"139 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81398002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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