The microstructural characteristics, mechanical properties and wear characterization of air plasma sprayed coatings obtained from Carbon nanotubes (CNTs) reinforced Al2O3-3wt%TiO2 powders were examined at different loading conditions and different percentage proportion of CNTs. The CNTs in the proportion of 2, 4, and 6 wt% were used as nanofillers to modify the properties of coatings. The uniform dispersion of CNTs throughout the powder particles can be observed from the SEM micrographs. The porosity of the microstructure of the coatings was measured by image analysis. Also, the mechanical properties such as microhardness and surface roughness were measured by microhardness tester and profilometer, respectively. The wear tribometer was used to analyze the tribology of the coatings by varying different parameters. The different loading conditions used were low load (0.5 kgf), moderate load (1.0 kgf), and elevated load (1.5 kgf), respectively. The microhardness showed a slight increase with an increase in the percentage of CNTs proportion. Similarly, the surface roughness value showed a decreasing trend, since the CNTs were filled in the pores. From wear tests, it was observed that the coefficient of friction and wear rate were very less at 6wt% CNTs and 1.5 kgf load. This was mainly due to the bridging of CNTs in between the splats. This implies that CNTs were one of the most suitable additives for improving the microstructural and tribological characteristics of the ceramic coatings.
{"title":"Impact of Carbon Nanotubes Reinforcement on Microstructural and Tribological Characteristics of Air Plasma Sprayed Conventional Alumina-Titania (Al2O3-3wt%TiO2) Coatings","authors":"V. Bolleddu","doi":"10.22068/IJMSE.17.3.92","DOIUrl":"https://doi.org/10.22068/IJMSE.17.3.92","url":null,"abstract":"The microstructural characteristics, mechanical properties and wear characterization of air plasma sprayed coatings obtained from Carbon nanotubes (CNTs) reinforced Al2O3-3wt%TiO2 powders were examined at different loading conditions and different percentage proportion of CNTs. The CNTs in the proportion of 2, 4, and 6 wt% were used as nanofillers to modify the properties of coatings. The uniform dispersion of CNTs throughout the powder particles can be observed from the SEM micrographs. The porosity of the microstructure of the coatings was measured by image analysis. Also, the mechanical properties such as microhardness and surface roughness were measured by microhardness tester and profilometer, respectively. The wear tribometer was used to analyze the tribology of the coatings by varying different parameters. The different loading conditions used were low load (0.5 kgf), moderate load (1.0 kgf), and elevated load (1.5 kgf), respectively. The microhardness showed a slight increase with an increase in the percentage of CNTs proportion. Similarly, the surface roughness value showed a decreasing trend, since the CNTs were filled in the pores. From wear tests, it was observed that the coefficient of friction and wear rate were very less at 6wt% CNTs and 1.5 kgf load. This was mainly due to the bridging of CNTs in between the splats. This implies that CNTs were one of the most suitable additives for improving the microstructural and tribological characteristics of the ceramic coatings.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":" ","pages":"92-103"},"PeriodicalIF":1.0,"publicationDate":"2020-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48150181","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}
The effect of erbium (Er) addition at various weight percentages (0-0.6 wt.% at an interval of 0.2) on the microstructural features, tensile properties and wear behavior of as-cast Al-7.5Si-0.5Mg alloy were evaluated. The microstructure of the specimens was examined by X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM). The obtained results clearly demonstrated that the incorporation of erbium decreased the α-Al grain size and eutectic Si, and altered the Si morphology from plate to semi-globular. Further addition of erbium (> 0.2 wt.%) did not alter the eutectic morphology and size. Moreover, the Al3Er phase was also observed in the eutectic region after modification. Out of the erbium contents used, 0.2 wt.% erbium showed the best influence on the tensile and wear properties. Compared with those of unmodified specimen, the values of ultimate tensile strength and elongation were enhanced by 31 and 39%, respectively through 0.2 wt. % erbium addition. Additionally, a remarkable enhancement in the wear properties was observed with the addition of 0.2
{"title":"Microstructure-Property Relationships in an Erbium-Modified Al-Si-Mg Alloy","authors":"R. Niazi, E. Tohidlou, H. Khosravi","doi":"10.22068/IJMSE.17.3.40","DOIUrl":"https://doi.org/10.22068/IJMSE.17.3.40","url":null,"abstract":"The effect of erbium (Er) addition at various weight percentages (0-0.6 wt.% at an interval of 0.2) on the microstructural features, tensile properties and wear behavior of as-cast Al-7.5Si-0.5Mg alloy were evaluated. The microstructure of the specimens was examined by X-ray diffraction (XRD), optical microscopy (OM) and scanning electron microscopy (SEM). The obtained results clearly demonstrated that the incorporation of erbium decreased the α-Al grain size and eutectic Si, and altered the Si morphology from plate to semi-globular. Further addition of erbium (> 0.2 wt.%) did not alter the eutectic morphology and size. Moreover, the Al3Er phase was also observed in the eutectic region after modification. Out of the erbium contents used, 0.2 wt.% erbium showed the best influence on the tensile and wear properties. Compared with those of unmodified specimen, the values of ultimate tensile strength and elongation were enhanced by 31 and 39%, respectively through 0.2 wt. % erbium addition. Additionally, a remarkable enhancement in the wear properties was observed with the addition of 0.2","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":"17 1","pages":"40-48"},"PeriodicalIF":1.0,"publicationDate":"2020-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45932901","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}
{"title":"Effect of Heat Treatment on Formation of Calcium Titanate Hollow-Crystals Nanostructures Prepared by Hydrothermal Method","authors":"S. Manafi, S. Joughehdoust","doi":"10.22068/IJMSE.17.2.51","DOIUrl":"https://doi.org/10.22068/IJMSE.17.2.51","url":null,"abstract":"","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":"17 1","pages":"51-57"},"PeriodicalIF":1.0,"publicationDate":"2020-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46039656","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}
{"title":"Quantum Dots in Therapeutic, Diagnostic and Drug Delivery Applications “A Brief Review”","authors":"A. Nemati","doi":"10.22068/IJMSE.17.2.1","DOIUrl":"https://doi.org/10.22068/IJMSE.17.2.1","url":null,"abstract":"","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":"17 1","pages":"1-12"},"PeriodicalIF":1.0,"publicationDate":"2020-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45144224","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}
{"title":"The Effect of Powder Composition on Cyclic Oxidation Behavior of CO-Deposited Al-Si Cating on Nickle-Based Superalloy","authors":"M. Safaei, S. Rastegari, R. Latifi","doi":"10.22068/IJMSE.17.2.104","DOIUrl":"https://doi.org/10.22068/IJMSE.17.2.104","url":null,"abstract":"","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":"17 1","pages":"104-115"},"PeriodicalIF":1.0,"publicationDate":"2020-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41424566","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}
Sa. Benkacem, K. Boudeghdegh, F. Zehani, Y. Belhocine
{"title":"Effect of ZrSiO4/ZnO Ratio on the Properties of Opaque Glazes Used in -Ceramic Sanitary-ware Industry","authors":"Sa. Benkacem, K. Boudeghdegh, F. Zehani, Y. Belhocine","doi":"10.22068/IJMSE.17.2.92","DOIUrl":"https://doi.org/10.22068/IJMSE.17.2.92","url":null,"abstract":"","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":"17 1","pages":"92-103"},"PeriodicalIF":1.0,"publicationDate":"2020-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44491007","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 study an effort has been made for the plasma ion nitriding (PIN) of Inconel 600 and 601 alloys at low temperatures. After plasma ion nitriding and microstructural study, growth kinetics of nitrided layer formation and wear properties were investigated by various characterization techniques such as scanning electron microscope (SEM), X-ray diffraction (XRD) analysis, micro-hardness measurement and wear test by pin on disk technique. It was found that surface micro-hardness increases after the PIN process. A mixed peak of epsilon (ε) and fcc (γ) phase was detected for all temperature range (350 to 450 C), while the chromium nitride (CrN) phase was detected at elevated temperature range ~450 C in Inconel 601 alloy. The calculated values of the diffusion coefficient and activation energy for the diffusion of nitrogen are in accordance with the literature. Volume loss and wear rate of the plasma nitrided samples decreases, but it increases as PIN process temperature increases.
{"title":"Chsracterization of Low Temperature Plasma Ion Nitriding (PIN) of Inconel 600 and 601 Alloys","authors":"R. Kumar, Y. Sharma, V. Sagar, D. Bhardwaj","doi":"10.22068/IJMSE.17.2.20","DOIUrl":"https://doi.org/10.22068/IJMSE.17.2.20","url":null,"abstract":"In this study an effort has been made for the plasma ion nitriding (PIN) of Inconel 600 and 601 alloys at low temperatures. After plasma ion nitriding and microstructural study, growth kinetics of nitrided layer formation and wear properties were investigated by various characterization techniques such as scanning electron microscope (SEM), X-ray diffraction (XRD) analysis, micro-hardness measurement and wear test by pin on disk technique. It was found that surface micro-hardness increases after the PIN process. A mixed peak of epsilon (ε) and fcc (γ) phase was detected for all temperature range (350 to 450 C), while the chromium nitride (CrN) phase was detected at elevated temperature range ~450 C in Inconel 601 alloy. The calculated values of the diffusion coefficient and activation energy for the diffusion of nitrogen are in accordance with the literature. Volume loss and wear rate of the plasma nitrided samples decreases, but it increases as PIN process temperature increases.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":"17 1","pages":"20-29"},"PeriodicalIF":1.0,"publicationDate":"2020-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45640618","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}
{"title":"A Substantial Red and Blue Shift in the Band Gap of Gamma Alumina Through Controlling the OH/Al and Concentration of Sulfate Precursor","authors":"M. Ghamari, M. Ghasemifard","doi":"10.22068/IJMSE.17.2.85","DOIUrl":"https://doi.org/10.22068/IJMSE.17.2.85","url":null,"abstract":"","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":" ","pages":"85-91"},"PeriodicalIF":1.0,"publicationDate":"2020-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47623946","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}
{"title":"Investigating the Leaching Behavior of Copper from Chalcopyrite Concentrate in H2SO4/CuCl2 Media","authors":"R. Katal, Asghar Azizi, M. Gharabaghi","doi":"10.22068/IJMSE.17.2.66","DOIUrl":"https://doi.org/10.22068/IJMSE.17.2.66","url":null,"abstract":"","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":"17 1","pages":"66-76"},"PeriodicalIF":1.0,"publicationDate":"2020-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44593318","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}
{"title":"Theoretical Investigation and Optimization of Radiation Thermal Conduction of Thermal-Insulation Polyolefin Foams","authors":"R. Hasanzadeh, S. Fathi, T. Azdast, M. Rostami","doi":"10.22068/IJMSE.17.2.58","DOIUrl":"https://doi.org/10.22068/IJMSE.17.2.58","url":null,"abstract":"","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":"17 1","pages":"58-65"},"PeriodicalIF":1.0,"publicationDate":"2020-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43988723","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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