M. A. Mahdi, A. Abdul-Hameed, Basil Ali, H. F. Al-Taay
Silicon nanowires (SiNWs) are synthesized through a metal-assisted chemical etching (MACE) method using Si(100) substrates and silver (Ag) as a catalyst. Scanning electron microscope (SEM) images confirmed that length of prepared SiNWs was increased when etching time increased. The prepared SiNWs demonstrated considerably low light reflectance at a wavelength range of 200–1100 nm. The photoluminescence (PL) spectra of the grown SiNWs showed a broad emission band peaked at a wavelength of about 750 nm. A solar cell and photodetector based on heterojunction SiNWs/PEDOT:PSS were fabricated using SiNWs that prepared with different etching time and its J–V, sensitivity, and time response were investigated. The conversion efficiency of fabricated solar cell was increased from 0.39% to 0.68% when wire length decreased from 24 µm to 21 µm, respectively. However, the sensitivity of the heterojunction SiNWs/PEDOT:PSS photodetector was decreased from 53774% to 36826% when wire length decreased from 24 µm to 21 µm, respectively.
{"title":"Fabrication of SiNWs/PEDOT:PSS Heterojunction Solar Cells","authors":"M. A. Mahdi, A. Abdul-Hameed, Basil Ali, H. F. Al-Taay","doi":"10.22068/IJMSE.17.1.69","DOIUrl":"https://doi.org/10.22068/IJMSE.17.1.69","url":null,"abstract":"Silicon nanowires (SiNWs) are synthesized through a metal-assisted chemical etching (MACE) method using Si(100) substrates and silver (Ag) as a catalyst. Scanning electron microscope (SEM) images confirmed that length of prepared SiNWs was increased when etching time increased. The prepared SiNWs demonstrated considerably low light reflectance at a wavelength range of 200–1100 nm. The photoluminescence (PL) spectra of the grown SiNWs showed a broad emission band peaked at a wavelength of about 750 nm. A solar cell and photodetector based on heterojunction SiNWs/PEDOT:PSS were fabricated using SiNWs that prepared with different etching time and its J–V, sensitivity, and time response were investigated. The conversion efficiency of fabricated solar cell was increased from 0.39% to 0.68% when wire length decreased from 24 µm to 21 µm, respectively. However, the sensitivity of the heterojunction SiNWs/PEDOT:PSS photodetector was decreased from 53774% to 36826% when wire length decreased from 24 µm to 21 µm, respectively.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2020-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48052509","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}
In the present investigation, A356-TiB2/TiC composites with a various reinforcement ratios (0, 2.5, 5 and 7.5%) were synthesized through a K2TiF6-KBF4-Graphite (C) reaction system. Formation of TiB2 and TiC particulates and their distribution are confirmed by various characterization techniques. The tensile properties such as ultimate strength, yield strength, young’s modulus and percentage of elongation in addition to their failure behavior of were studied at ambiant and high temperatures (100, 200 and 3000C). The increment in the volume fraction of the composite raised the hardness and the enhancement of hardness was reported up to 49% at 7.5% reinforced composite due to the strengthening effect. The density and porosity of fabricated composites were investigated. The rise in the volume fraction of reinforcement phase decreased the density and increased the porosity of composite samples. Further, the ultimate strength, yield strength, young’s modulus declined with the rise in the temperature. Result analysis also illustrates that the 7.5% reinforced composite retained the ultimate strength up to 84.4% and the ductility was raised by 27% at 3000C. Yield strength and young’s modulus were also retained 74.31% and 71.09% respectively at the similar material and experimental conditions. The fracture surface analysis of the composites showed that, the ductile nature of failure appearance microscopically with the formation of fine dimples and voids on fracture surface at elevated temperatures. Cleavage facets and tear crumples observation indicated the brittle kind of failure at the ambient temperature. Findings from the experimental study provide the tensile behavior of the composites at the regular working temperature of the automobile engine piston.
{"title":"High Temperature Tensile Behavior of A356-TiB2/TiC in-situ Composites","authors":"Ismail Kakaravada, A. Mahamani, V. Pandurangadu","doi":"10.22068/IJMSE.17.1.56","DOIUrl":"https://doi.org/10.22068/IJMSE.17.1.56","url":null,"abstract":"In the present investigation, A356-TiB2/TiC composites with a various reinforcement ratios (0, 2.5, 5 and 7.5%) were synthesized through a K2TiF6-KBF4-Graphite (C) reaction system. Formation of TiB2 and TiC particulates and their distribution are confirmed by various characterization techniques. The tensile properties such as ultimate strength, yield strength, young’s modulus and percentage of elongation in addition to their failure behavior of were studied at ambiant and high temperatures (100, 200 and 3000C). The increment in the volume fraction of the composite raised the hardness and the enhancement of hardness was reported up to 49% at 7.5% reinforced composite due to the strengthening effect. The density and porosity of fabricated composites were investigated. The rise in the volume fraction of reinforcement phase decreased the density and increased the porosity of composite samples. Further, the ultimate strength, yield strength, young’s modulus declined with the rise in the temperature. Result analysis also illustrates that the 7.5% reinforced composite retained the ultimate strength up to 84.4% and the ductility was raised by 27% at 3000C. Yield strength and young’s modulus were also retained 74.31% and 71.09% respectively at the similar material and experimental conditions. The fracture surface analysis of the composites showed that, the ductile nature of failure appearance microscopically with the formation of fine dimples and voids on fracture surface at elevated temperatures. Cleavage facets and tear crumples observation indicated the brittle kind of failure at the ambient temperature. Findings from the experimental study provide the tensile behavior of the composites at the regular working temperature of the automobile engine piston.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2020-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42697563","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}
V. T. Kajinebaf, M. Z. Khame-Forosh, H. Sarpoolaky
In this research, the nanostructured titania-coated silica microsphere (NTCSM) membrane consisting of titania-silica core-shell particles on α–alumina substrate was prepared by dip-coating method. The silica microspheres were synthesized by the Stöber method, and the nanostructured titania shell was obtained from a polymeric sol. Then, the prepared core-shell particles were deposited on alumina substrates. The samples were characterized by DLS, TG-DTA, XRD, FTIR and SEM. The photo-catalytic activity of the NTCSM membranes was evaluated using photo-degradation of methyl orange solution by UV–visible spectrophotometer. In addition, physical separation capability was investigated by filtration experiment based on methyl orange removal from aqueous solution using a membrane setup. The mean particle size of silica microspheres was determined to be around 650 nm, which increased to about 800nm by the deposition of titania nano-particles. After 60 min of UV-irradiation, the dye removal efficiency was determined to be 80% by the membrane. By coupling separation process with photo-catalytic technique, the removal efficiency was improved up to 97%. Thus, the NTCSM membranes showed simultaneous photo-degradation and separation capabilities for dye removal from water.
{"title":"Preparation and Characterization of Nanostructured Titania-coated Silica Microsphere Membranes with Simultaneous Photo-catalytic and Separation Applications for Water Treatment","authors":"V. T. Kajinebaf, M. Z. Khame-Forosh, H. Sarpoolaky","doi":"10.22068/IJMSE.17.1.35","DOIUrl":"https://doi.org/10.22068/IJMSE.17.1.35","url":null,"abstract":"In this research, the nanostructured titania-coated silica microsphere (NTCSM) membrane consisting of titania-silica core-shell particles on α–alumina substrate was prepared by dip-coating method. The silica microspheres were synthesized by the Stöber method, and the nanostructured titania shell was obtained from a polymeric sol. Then, the prepared core-shell particles were deposited on alumina substrates. The samples were characterized by DLS, TG-DTA, XRD, FTIR and SEM. The photo-catalytic activity of the NTCSM membranes was evaluated using photo-degradation of methyl orange solution by UV–visible spectrophotometer. In addition, physical separation capability was investigated by filtration experiment based on methyl orange removal from aqueous solution using a membrane setup. The mean particle size of silica microspheres was determined to be around 650 nm, which increased to about 800nm by the deposition of titania nano-particles. After 60 min of UV-irradiation, the dye removal efficiency was determined to be 80% by the membrane. By coupling separation process with photo-catalytic technique, the removal efficiency was improved up to 97%. Thus, the NTCSM membranes showed simultaneous photo-degradation and separation capabilities for dye removal from water.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2020-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47734111","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}
In this paper a constitutive equation was considered for the isothermal hot compression test of the Mn-Ni-Cr alloy. The hot compression test was performed in the strain rate range of 0.001-0.1 s-1 and deformation temperature was varied from 700 to 900 °C. A considerable reduction in flow stress was observed regardless of the strain rate when temperature was increased from 700 to 750 °C. DTA and XRD evaluation revealed that the removal of Mn3Cr phase and formation of the single solid solution phase were the reason for the flow stress reduction. At the low deformation temperature (700°C) and the high strain rate (0.1 s-1), a partially recrystallized microstructure was observed; this was such that with increasing the temperature and decreasing the strain rate, a recrystallized microstructure was completed. Also, the relationships between flow stress, strain rate and deformation temperature were addressed by the Zener-Holloman parameter in the exponent type with the hot deformation activation energy of 301.07 KJ/mol. Finally, the constitutive equation was proposed for predicting the flow stress at various strain rates and temperatures.
{"title":"Hot Deformation of the Mn-Ni-Cr Alloy During Compression","authors":"M. Sadeghi, M. Hadi, O. Bayat, H. Karimi","doi":"10.22068/IJMSE.17.1.102","DOIUrl":"https://doi.org/10.22068/IJMSE.17.1.102","url":null,"abstract":"In this paper a constitutive equation was considered for the isothermal hot compression test of the Mn-Ni-Cr alloy. The hot compression test was performed in the strain rate range of 0.001-0.1 s-1 and deformation temperature was varied from 700 to 900 °C. A considerable reduction in flow stress was observed regardless of the strain rate when temperature was increased from 700 to 750 °C. DTA and XRD evaluation revealed that the removal of Mn3Cr phase and formation of the single solid solution phase were the reason for the flow stress reduction. At the low deformation temperature (700°C) and the high strain rate (0.1 s-1), a partially recrystallized microstructure was observed; this was such that with increasing the temperature and decreasing the strain rate, a recrystallized microstructure was completed. Also, the relationships between flow stress, strain rate and deformation temperature were addressed by the Zener-Holloman parameter in the exponent type with the hot deformation activation energy of 301.07 KJ/mol. Finally, the constitutive equation was proposed for predicting the flow stress at various strain rates and temperatures.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2020-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48848213","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}
This work evaluates the resistance of alkali-activated slag (AAS) mortar against sodium sulfate attack. The effects of immersion in 5% sodium sulfate solution under room temperature and wetting-drying cycles on the compressive strength of mortar specimens were considered to evaluate the extent of degradation. Mortar specimens prepared from type II and V Portland cements (PC2 and PC5) in accordance with ASTM standard were also used as a reference. To characterize the chemical products of the degradation process due to sodium sulfate attack, the specimens were also studied by X-ray diffractometry, scanning electron microscopy, and the elemental analysis by energy-dispersive X-ray spectroscopy. After 360 days of exposure to the sodium sulfate solution, PC2, PC5 and AAS cements showed 71, 52 and 45% reduction in compressive strength, respectively. According to the obtained results, AAS cement exhibits a higher sulfate resistance compared to PC2 and PC5.
{"title":"Resistance of Alkali-activated Slag Cement Against Sodium Sulfate","authors":"A. Allahverdi, H. Hashemi, M. Mahinroosta","doi":"10.22068/IJMSE.17.1.23","DOIUrl":"https://doi.org/10.22068/IJMSE.17.1.23","url":null,"abstract":"This work evaluates the resistance of alkali-activated slag (AAS) mortar against sodium sulfate attack. The effects of immersion in 5% sodium sulfate solution under room temperature and wetting-drying cycles on the compressive strength of mortar specimens were considered to evaluate the extent of degradation. Mortar specimens prepared from type II and V Portland cements (PC2 and PC5) in accordance with ASTM standard were also used as a reference. To characterize the chemical products of the degradation process due to sodium sulfate attack, the specimens were also studied by X-ray diffractometry, scanning electron microscopy, and the elemental analysis by energy-dispersive X-ray spectroscopy. After 360 days of exposure to the sodium sulfate solution, PC2, PC5 and AAS cements showed 71, 52 and 45% reduction in compressive strength, respectively. According to the obtained results, AAS cement exhibits a higher sulfate resistance compared to PC2 and PC5.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2020-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47226691","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}
F. Hosseinabadi, A. Rezaee-Bazzaz, M. Mazinani, B. Sadeghi
An experimental–numerical methodology was used in order to study the microstructural effects on stress state dependency of martensitic transformation kinetics in two different TRIP800 low alloy multiphase steels. Representative volume elements extracted from actual microstructure were utilized to stimulate the mechanical behavior of above mentioned steels. The mechanical behavior for each constituent phases required in the model was taken out from those reported in the literature. A stress invariant based transformation kinetics law was used to predict the martensitic phase transformation during deformation. Crystallographic and thermodynamic theories of martensitic phase transformation were utilized to estimate the constant parameters of the kinetics law, in a recently performed investigation. However, the sensitivity of the transformation to the stress state remained as an adjustable parameter. The results of the current work show that the stress state sensitivity of martensitic phase transformation in the investigated steels is microstructure-dependent and the value of this parameter is almost equal to half of the bainite volume fraction. Therefore, the volume fraction of bainite in the low-alloy multiphase TRIP800 steels can be used as a first postulation to determine the value of the martensitic phase transformation sensitivity to the stress state. The microstructure based model previously developed for calculating the mechanical behavior of the TRIP800 steels can be utilized as a virtual design tool for the development of TRIP steels having specific mechanical properties.
{"title":"Effect of Microstructure on Stress Dependence of Transformation Induced Plasticity in TRIP800 Low-Alloy Multiphase Steels","authors":"F. Hosseinabadi, A. Rezaee-Bazzaz, M. Mazinani, B. Sadeghi","doi":"10.22068/IJMSE.17.1.109","DOIUrl":"https://doi.org/10.22068/IJMSE.17.1.109","url":null,"abstract":"An experimental–numerical methodology was used in order to study the microstructural effects on stress state dependency of martensitic transformation kinetics in two different TRIP800 low alloy multiphase steels. Representative volume elements extracted from actual microstructure were utilized to stimulate the mechanical behavior of above mentioned steels. The mechanical behavior for each constituent phases required in the model was taken out from those reported in the literature. A stress invariant based transformation kinetics law was used to predict the martensitic phase transformation during deformation. Crystallographic and thermodynamic theories of martensitic phase transformation were utilized to estimate the constant parameters of the kinetics law, in a recently performed investigation. However, the sensitivity of the transformation to the stress state remained as an adjustable parameter. The results of the current work show that the stress state sensitivity of martensitic phase transformation in the investigated steels is microstructure-dependent and the value of this parameter is almost equal to half of the bainite volume fraction. Therefore, the volume fraction of bainite in the low-alloy multiphase TRIP800 steels can be used as a first postulation to determine the value of the martensitic phase transformation sensitivity to the stress state. The microstructure based model previously developed for calculating the mechanical behavior of the TRIP800 steels can be utilized as a virtual design tool for the development of TRIP steels having specific mechanical properties.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2020-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43130222","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}
M. Hoghooghi, O. Jafari, S. Amani, G. Faraji, K. Abrinia
Spread extrusion is a capable method to produce different samples with a wider cross-section from the smaller billets in a single processing pass. In this study, dish-shaped samples are successfully produced from the as-cast cylindrical AM60 magnesium alloy at 300 °C, the mechanical properties and microstructural changes of the nal specimens are precisely evaluated. Due to the high amount of plastic strain, which is applied to the initial billet during the material ow in the expansion process, grain re nement occurred as a result of recrystallization and subsequently good mechanical properties achieved. Therefore, mean grain size reduced from 160 μm to 14 μm and initial equiaxed grains changed to the elongated ones surrounded by ne grains. Also, microhardness measurements indicate that hardness increased from 51 Hv to 70 Hv. Some uctuations were also observed in the hardness pro le of the sample which was mainly related to the bimodal structure of the nal microstructure. Good mechanical properties, ne microstructure, and also the ability to produce samples with higher cross-section make the spread extrusion process a promising type of extrusion.
{"title":"Microstructure and Hardness Evaluation of Magnesium Samples Processed by a New Design of Spread Extrusion Method","authors":"M. Hoghooghi, O. Jafari, S. Amani, G. Faraji, K. Abrinia","doi":"10.22068/IJMSE.16.4.27","DOIUrl":"https://doi.org/10.22068/IJMSE.16.4.27","url":null,"abstract":"Spread extrusion is a capable method to produce different samples with a wider cross-section from the smaller billets in a single processing pass. In this study, dish-shaped samples are successfully produced from the as-cast cylindrical AM60 magnesium alloy at 300 °C, the mechanical properties and microstructural changes of the nal specimens are precisely evaluated. Due to the high amount of plastic strain, which is applied to the initial billet during the material ow in the expansion process, grain re nement occurred as a result of recrystallization and subsequently good mechanical properties achieved. Therefore, mean grain size reduced from 160 μm to 14 μm and initial equiaxed grains changed to the elongated ones surrounded by ne grains. Also, microhardness measurements indicate that hardness increased from 51 Hv to 70 Hv. Some uctuations were also observed in the hardness pro le of the sample which was mainly related to the bimodal structure of the nal microstructure. Good mechanical properties, ne microstructure, and also the ability to produce samples with higher cross-section make the spread extrusion process a promising type of extrusion.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48525614","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}
V. Dave, R. Kotian, Prashanthi Madhyastha, K. Boaz, P. Rao, B. P. Charitha
The aim of the present study was to assess the hardness, corrosion, and cytotoxicity of a commercially available cobalt-chromium (Co-Cr) alloy before and after simulated heat treatments at porcelain ring temperature. Five Co-Cr samples were fabricated using a lost wax casting procedure. Heat treatments were carried out at 650 °C, 750 °C, 850 °C, and 950 °C. Vickers hardness was measured for as-cast and heat-treated samples. The corrosion test was carried out separately in 0.1 N NaCl, 1% citric acid and arti cial saliva at room temperature using potentiodynamic polarization technique. Gingival tissue biopsy of patients was taken and cultured to measure the cell viability by MTT colorimetric assay. Lowest hardness was observed at 650 °C. 0.1 N NaCl and 1% citric acid corrosion medium showed a similar trend of corrosion rate. The least corrosion rate was found in arti cial saliva. Firing temperature has an impact on the physical, chemical, and biological properties of Co-Cr alloy in long-term clinical use.
本研究的目的是评估一种市售钴铬(Co-Cr)合金在瓷环温度下模拟热处理前后的硬度、腐蚀和细胞毒性。采用失蜡铸造工艺制备了5个Co-Cr样品。在650°C、750°C、850°C和950°C下进行热处理。测定了铸态和热处理试样的维氏硬度。采用动电位极化技术分别在0.1 N NaCl、1%柠檬酸和人工唾液中进行室温腐蚀试验。取患者牙龈组织活检培养，采用MTT比色法测定细胞活力。在650℃时硬度最低。0.1 N NaCl和1%柠檬酸腐蚀介质的腐蚀速率变化趋势相似。人工唾液的腐蚀速率最低。在临床长期使用中，烧成温度对Co-Cr合金的物理、化学和生物性能都有影响。
{"title":"Simulated Porcelain Firing of CO-CR Alloy","authors":"V. Dave, R. Kotian, Prashanthi Madhyastha, K. Boaz, P. Rao, B. P. Charitha","doi":"10.22068/IJMSE.16.4.36","DOIUrl":"https://doi.org/10.22068/IJMSE.16.4.36","url":null,"abstract":"The aim of the present study was to assess the hardness, corrosion, and cytotoxicity of a commercially available cobalt-chromium (Co-Cr) alloy before and after simulated heat treatments at porcelain ring temperature. Five Co-Cr samples were fabricated using a lost wax casting procedure. Heat treatments were carried out at 650 °C, 750 °C, 850 °C, and 950 °C. Vickers hardness was measured for as-cast and heat-treated samples. The corrosion test was carried out separately in 0.1 N NaCl, 1% citric acid and arti cial saliva at room temperature using potentiodynamic polarization technique. Gingival tissue biopsy of patients was taken and cultured to measure the cell viability by MTT colorimetric assay. Lowest hardness was observed at 650 °C. 0.1 N NaCl and 1% citric acid corrosion medium showed a similar trend of corrosion rate. The least corrosion rate was found in arti cial saliva. Firing temperature has an impact on the physical, chemical, and biological properties of Co-Cr alloy in long-term clinical use.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42584870","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}
A. Jalaukan, S. M. Aldowaib, A. Hammed, B. G. Shohany, R. Etefagh, A. Żak
{"title":"Preparation and Investigation of Photo Catalytic Activity and Antibacterial Properties of TiO2/GO Thin Film","authors":"A. Jalaukan, S. M. Aldowaib, A. Hammed, B. G. Shohany, R. Etefagh, A. Żak","doi":"10.22068/IJMSE.16.4.53","DOIUrl":"https://doi.org/10.22068/IJMSE.16.4.53","url":null,"abstract":"","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43970439","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}
In this work, lithium meta titanate (Li2TiO3) nanocrystallites were synthesized by hydrothermal method and subsequent heat treatment. The shrinkage of the powder compact was measured under constant heating rate in order to study the sintering behavior of the synthesized powders. Densification curves of the synthesized powders were also constructed via the dilatometry analysis and evaluated at several heating rates. Two separate methods of analytical procedure and master curve sintering were employed to determine the activation energy of the initial sintering stage. The activation energy values were estimated based on these two distinct methods as 229±14 and 230 kJ/mol respectively, consistenting with each other. Moreover, surface diffusion was determined as the dominant mechanism of densification on initial sintering of Li2TiO3 nanocrystallites.
{"title":"Sintering Behavior of Lithium Meta Titanate Nanocrystallites","authors":"A. Abbasian, M. Rahimipour, Z. Hamnabard","doi":"10.22068/IJMSE.16.4.43","DOIUrl":"https://doi.org/10.22068/IJMSE.16.4.43","url":null,"abstract":"In this work, lithium meta titanate (Li2TiO3) nanocrystallites were synthesized by hydrothermal method and subsequent heat treatment. The shrinkage of the powder compact was measured under constant heating rate in order to study the sintering behavior of the synthesized powders. Densification curves of the synthesized powders were also constructed via the dilatometry analysis and evaluated at several heating rates. Two separate methods of analytical procedure and master curve sintering were employed to determine the activation energy of the initial sintering stage. The activation energy values were estimated based on these two distinct methods as 229±14 and 230 kJ/mol respectively, consistenting with each other. Moreover, surface diffusion was determined as the dominant mechanism of densification on initial sintering of Li2TiO3 nanocrystallites.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2019-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47951697","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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