Pub Date : 2020-04-23DOI: 10.1504/ijmmp.2020.106925
A. Azaiz, A. Kadari, N. Alves, L. O. Faria
In this paper, we report a modelling investigation of the thermoluminescence mechanisms for the important dosimetric LaAlO3:C crystals, which were grown by solid state reaction method. The aim of this work is to develop for the first time an algorithm that permits the numerical solution of the relevant sets of differential equations governing the different stages of the experimental procedure. The glow curve measured at 10K/s typically consists of three prominent peaks at 417 K, 494 K and 549 K and a minor glow peak at around 372 K. In this work, we show that this TL output behaviour can rather easily be explained within the framework of the 4T1R model. Good agreement between the experimental data and calculations from the model is obtained for this kind of dosimetric material. Results presented here confirm that the LaAlO3:C system an excellent candidate that can be used as a TL dosimeter in UV fields.
{"title":"Influence of carbon doping on the thermoluminescence properties of LaAlO3 crystal grown by solid state reaction method","authors":"A. Azaiz, A. Kadari, N. Alves, L. O. Faria","doi":"10.1504/ijmmp.2020.106925","DOIUrl":"https://doi.org/10.1504/ijmmp.2020.106925","url":null,"abstract":"In this paper, we report a modelling investigation of the thermoluminescence mechanisms for the important dosimetric LaAlO3:C crystals, which were grown by solid state reaction method. The aim of this work is to develop for the first time an algorithm that permits the numerical solution of the relevant sets of differential equations governing the different stages of the experimental procedure. The glow curve measured at 10K/s typically consists of three prominent peaks at 417 K, 494 K and 549 K and a minor glow peak at around 372 K. In this work, we show that this TL output behaviour can rather easily be explained within the framework of the 4T1R model. Good agreement between the experimental data and calculations from the model is obtained for this kind of dosimetric material. Results presented here confirm that the LaAlO3:C system an excellent candidate that can be used as a TL dosimeter in UV fields.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/ijmmp.2020.106925","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41605076","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 : 2020-04-23DOI: 10.1504/ijmmp.2020.106921
Dipak Kumar, G. Shree, V. Dwivedi
In this article, Ni-SiC nano-composite coatings were fabricated using the conventional electrodeposition process, Watt's Nickel electroplating and sulfamate bath, applying on copper substrates. The goal of the present work was to improve wear resistance and hardness properties of Ni-SiC composite coatings by electrodeposition techniques. To obtain a better chemistry between SiC incorporations and Ni matrix and, afterwards, better wear resistance, the variation in the microhardness was considered as significant surface property of nanocomposites by examining the effect of various electrodeposition parameters such as, pH, temperature, current density, temperature, etc. The microhardness,778HV, and the wear resistance of the nanocomposite coatings was found to be increased with increasing content of Ni-SiC at optimised current values of 0.61A. Uniform distribution of coatings structure as cauliflower was confirmed by atomic force microscopy and scanning electron microscopy, while composition and crystallinity of Ni-SiC was confirmed by energy dispersive X-ray spectroscopy and X-ray diffractometry, respectively.
{"title":"Wear and hardness evaluation of electrodeposited Ni-SiC nanocomposite coated copper","authors":"Dipak Kumar, G. Shree, V. Dwivedi","doi":"10.1504/ijmmp.2020.106921","DOIUrl":"https://doi.org/10.1504/ijmmp.2020.106921","url":null,"abstract":"In this article, Ni-SiC nano-composite coatings were fabricated using the conventional electrodeposition process, Watt's Nickel electroplating and sulfamate bath, applying on copper substrates. The goal of the present work was to improve wear resistance and hardness properties of Ni-SiC composite coatings by electrodeposition techniques. To obtain a better chemistry between SiC incorporations and Ni matrix and, afterwards, better wear resistance, the variation in the microhardness was considered as significant surface property of nanocomposites by examining the effect of various electrodeposition parameters such as, pH, temperature, current density, temperature, etc. The microhardness,778HV, and the wear resistance of the nanocomposite coatings was found to be increased with increasing content of Ni-SiC at optimised current values of 0.61A. Uniform distribution of coatings structure as cauliflower was confirmed by atomic force microscopy and scanning electron microscopy, while composition and crystallinity of Ni-SiC was confirmed by energy dispersive X-ray spectroscopy and X-ray diffractometry, respectively.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1504/ijmmp.2020.106921","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48338866","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 : 2020-01-22DOI: 10.1504/ijmmp.2020.10026338
S. Avcıoğlu, S. Kurama
In this study, Dy+3, Y+3, and La+3 doped SiAlON ceramics were fabricated by using spark plasma sintering (SPS) technique. The effects of additive cation, starting composition and processing conditions on the morphological evolution as well as on the phase assembly of SiAlON ceramics were investigated. The influence of phase diversity on the optical properties of SiAlON ceramics was also discussed. Results indicate that the translucent α- SiAlON, α/β-SiAlON ceramics and their in-situ composites with AlNpolytypoids could be successfully obtained. The presence of a high amount of secondary phases such as AlN-polytype and the oxynitride glassy phase has been found to reduce the optical transmission of SiAlON ceramics. The doping of Y+3 and Dy+3 cations contributed better to the formation of single-phase α-SiAlON than that of La+3. Doping SiAlON ceramics with Dy+3 cation leads to the formation of relatively homogenised final microstructure. Therefore, higher IR transmission values were observed on Dy-α-SiAlON (42.2%) and Dy-α/β-SiAlON (45.07%) samples.
{"title":"Translucent α- and α/β-SiAlON ceramics: study on investigation of the relationship between phase diversity and optical properties","authors":"S. Avcıoğlu, S. Kurama","doi":"10.1504/ijmmp.2020.10026338","DOIUrl":"https://doi.org/10.1504/ijmmp.2020.10026338","url":null,"abstract":"In this study, Dy+3, Y+3, and La+3 doped SiAlON ceramics were fabricated by using spark plasma sintering (SPS) technique. The effects of additive cation, starting composition and processing conditions on the morphological evolution as well as on the phase assembly of SiAlON ceramics were investigated. The influence of phase diversity on the optical properties of SiAlON ceramics was also discussed. Results indicate that the translucent α- SiAlON, α/β-SiAlON ceramics and their in-situ composites with AlNpolytypoids could be successfully obtained. The presence of a high amount of secondary phases such as AlN-polytype and the oxynitride glassy phase has been found to reduce the optical transmission of SiAlON ceramics. The doping of Y+3 and Dy+3 cations contributed better to the formation of single-phase α-SiAlON than that of La+3. Doping SiAlON ceramics with Dy+3 cation leads to the formation of relatively homogenised final microstructure. Therefore, higher IR transmission values were observed on Dy-α-SiAlON (42.2%) and Dy-α/β-SiAlON (45.07%) samples.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44023992","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 : 2020-01-22DOI: 10.1504/ijmmp.2020.10026341
K. Devi, B. Saini, P. Aggarwal
The increase in global warming due to emission of greenhouse gases especially during the production of cement has become threat to the environment. The development of sustainable and economical materials has become need of the present scenario. Also, direct disposal of waste from stone industries is becoming serious issue to ecosystem and need its safe disposal. Accelerators are being used to accelerate stiffening and early age strength development of mortar/concrete. In this study, Kota stone powder (KSP) as partial substitution to cement and admixtures, i.e., calcium nitrate, triethanolamine as additives were used individually and in combination to examine their influence on strength, durability and micro-structural properties at later age. The aim of study was to check the viability of these materials in concrete under different environmental conditions; and to make sustainable concrete by reducing cement and cost. Admixtures and stone powder individually improved the properties; while, their mixture diminished concrete properties.
{"title":"Long-term performance of concrete using additives","authors":"K. Devi, B. Saini, P. Aggarwal","doi":"10.1504/ijmmp.2020.10026341","DOIUrl":"https://doi.org/10.1504/ijmmp.2020.10026341","url":null,"abstract":"The increase in global warming due to emission of greenhouse gases especially during the production of cement has become threat to the environment. The development of sustainable and economical materials has become need of the present scenario. Also, direct disposal of waste from stone industries is becoming serious issue to ecosystem and need its safe disposal. Accelerators are being used to accelerate stiffening and early age strength development of mortar/concrete. In this study, Kota stone powder (KSP) as partial substitution to cement and admixtures, i.e., calcium nitrate, triethanolamine as additives were used individually and in combination to examine their influence on strength, durability and micro-structural properties at later age. The aim of study was to check the viability of these materials in concrete under different environmental conditions; and to make sustainable concrete by reducing cement and cost. Admixtures and stone powder individually improved the properties; while, their mixture diminished concrete properties.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46783685","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 : 2020-01-21DOI: 10.1504/ijmmp.2020.10026337
Jianna Huang, Xuan Wang
To solve the problem of large error in traditional testing methods for automotive aluminium alloy materials, a testing method for mechanical properties of automotive aluminium alloy materials based on elastohydrodynamic model was proposed. Firstly, the elastohydrodynamic model of automobile aluminium alloy material is constructed to obtain the bearing capacity and strength of automobile aluminium alloy material. Secondly, based on the elastohydrodynamic model of automobile aluminium alloy material, the load and yield strength of automobile aluminium alloy material mechanical components are analysed, and the vehicle use is estimated. Parameters of mechanical components of aluminium alloy materials. Finally, the mechanical properties of automotive aluminium alloys were further optimised by the evaluation method of under-actuated two-degree-of-freedom mechanism and the calculation of the coupling eigenfunction of mechanical properties of aluminium alloys and the energy equation of the relationship between friction force and friction coefficient.
{"title":"Mechanics study of automotive aluminium alloy materials based on elastohydrodynamic model","authors":"Jianna Huang, Xuan Wang","doi":"10.1504/ijmmp.2020.10026337","DOIUrl":"https://doi.org/10.1504/ijmmp.2020.10026337","url":null,"abstract":"To solve the problem of large error in traditional testing methods for automotive aluminium alloy materials, a testing method for mechanical properties of automotive aluminium alloy materials based on elastohydrodynamic model was proposed. Firstly, the elastohydrodynamic model of automobile aluminium alloy material is constructed to obtain the bearing capacity and strength of automobile aluminium alloy material. Secondly, based on the elastohydrodynamic model of automobile aluminium alloy material, the load and yield strength of automobile aluminium alloy material mechanical components are analysed, and the vehicle use is estimated. Parameters of mechanical components of aluminium alloy materials. Finally, the mechanical properties of automotive aluminium alloys were further optimised by the evaluation method of under-actuated two-degree-of-freedom mechanism and the calculation of the coupling eigenfunction of mechanical properties of aluminium alloys and the energy equation of the relationship between friction force and friction coefficient.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41477680","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 : 2020-01-21DOI: 10.1504/ijmmp.2020.10026339
G. Pekkan, E. Taşçi, K. Pekkan, Murat Ispalarli
Co-Cr alloys have been used for many years in dentistry. In recent years, the fabrication of prosthetic restorations from Co-Cr alloys by metal laser sintering method has become widespread. This method is a combination of powder metallurgy and three-dimensional printing technologies. The surface microstructure of the material and the different phases formed on the surface of the material after sintering and heat treatment are extremely important since these metal substructures are layered with dental porcelain in fixed prosthetic dentistry. In this study, characterisation of Co-Cr alloy samples produced by direct metal laser sintering (DMLS) method and sintering under various atmospheric conditions were performed with X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy-dispersive X-ray diffractometer (EDX). It was observed that sintering with different methods under various atmospheric conditions affected the XRD phase intensities. The sintering in the argon gas atmosphere yielded a more significant phase separation that facilitates the identification of different phases in XRD patterns.
{"title":"Effect of different sintering conditions on microstructural characterisation of Co-Cr metal laser powder","authors":"G. Pekkan, E. Taşçi, K. Pekkan, Murat Ispalarli","doi":"10.1504/ijmmp.2020.10026339","DOIUrl":"https://doi.org/10.1504/ijmmp.2020.10026339","url":null,"abstract":"Co-Cr alloys have been used for many years in dentistry. In recent years, the fabrication of prosthetic restorations from Co-Cr alloys by metal laser sintering method has become widespread. This method is a combination of powder metallurgy and three-dimensional printing technologies. The surface microstructure of the material and the different phases formed on the surface of the material after sintering and heat treatment are extremely important since these metal substructures are layered with dental porcelain in fixed prosthetic dentistry. In this study, characterisation of Co-Cr alloy samples produced by direct metal laser sintering (DMLS) method and sintering under various atmospheric conditions were performed with X-ray diffractometer (XRD), scanning electron microscope (SEM) and energy-dispersive X-ray diffractometer (EDX). It was observed that sintering with different methods under various atmospheric conditions affected the XRD phase intensities. The sintering in the argon gas atmosphere yielded a more significant phase separation that facilitates the identification of different phases in XRD patterns.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49529215","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 : 2020-01-21DOI: 10.1504/ijmmp.2020.10026340
Iftekar Gull, M. Tantray
This study highlights the fresh state flow properties and hardened state compressive strength properties of short carbon fibre reinforced selfcompacting concrete. 15 mixes with varying W/C ratio, cement content, and the percentage of carbon fibres were investigated. The impact of the variations on the self-compacting concrete was analysed by comparing the mixes to the control mix. The present study investigations revealed a decrease in filling and passing ability of CFRSCC with the addition of higher percentages of carbon fibres while the addition of carbon fibre at lower percentage exhibits improvement in the filling, passing and segregation resistance properties. It was also observed that with the inclusion of short carbon fibres, the compressive strength was significantly improved. The microstructure of the CFRSCC with different percentages of Carbon fibre was also analysed and is presented in this study.
{"title":"Effect of short carbon fibres on the fresh state and compressive strength properties of self-compacting concrete","authors":"Iftekar Gull, M. Tantray","doi":"10.1504/ijmmp.2020.10026340","DOIUrl":"https://doi.org/10.1504/ijmmp.2020.10026340","url":null,"abstract":"This study highlights the fresh state flow properties and hardened state compressive strength properties of short carbon fibre reinforced selfcompacting concrete. 15 mixes with varying W/C ratio, cement content, and the percentage of carbon fibres were investigated. The impact of the variations on the self-compacting concrete was analysed by comparing the mixes to the control mix. The present study investigations revealed a decrease in filling and passing ability of CFRSCC with the addition of higher percentages of carbon fibres while the addition of carbon fibre at lower percentage exhibits improvement in the filling, passing and segregation resistance properties. It was also observed that with the inclusion of short carbon fibres, the compressive strength was significantly improved. The microstructure of the CFRSCC with different percentages of Carbon fibre was also analysed and is presented in this study.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44527486","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: 10.1504/IJMMP.2020.10038143
N. A. Bü, lent Aktaş
{"title":"Relationship between microstructure and fracture toughness in B2O3-doped 8YSZ ceramics","authors":"N. A. Bü, lent Aktaş","doi":"10.1504/IJMMP.2020.10038143","DOIUrl":"https://doi.org/10.1504/IJMMP.2020.10038143","url":null,"abstract":"","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":"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":"66748688","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: 10.1504/ijmmp.2020.10044933
Guofeng Zhang, Na Xiao
{"title":"Study on hydrophilic properties of transparent conductive nano silver films in ionic liquids","authors":"Guofeng Zhang, Na Xiao","doi":"10.1504/ijmmp.2020.10044933","DOIUrl":"https://doi.org/10.1504/ijmmp.2020.10044933","url":null,"abstract":"","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":"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":"66748328","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: 10.1504/ijmmp.2020.10044929
Youtang Gao
{"title":"Detection of grinding surface damage of nanocrystalline optical glass based on wavelet transfinite learning machine","authors":"Youtang Gao","doi":"10.1504/ijmmp.2020.10044929","DOIUrl":"https://doi.org/10.1504/ijmmp.2020.10044929","url":null,"abstract":"","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":"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":"66748743","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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