Iranian Journal of Materials Science and Engineering最新文献_第3页

Implication of Thermodynamic Functions and Speciation Diagrams in Analysis of Solvent Extraction Behavior of Samarium from Acidic Solutions 热力学函数和形态图在分析酸性溶液中钐的溶剂萃取行为中的意义

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Iranian Journal of Materials Science and Engineering Pub Date : 2021-09-10 DOI: 10.22068/IJMSE.2105

H. Tavakoli, M. Aboutalebi, H. Seyedein, S. N. Ashrafizadeh

{"title":"Implication of Thermodynamic Functions and Speciation Diagrams in Analysis of Solvent Extraction Behavior of Samarium from Acidic Solutions","authors":"H. Tavakoli, M. Aboutalebi, H. Seyedein, S. N. Ashrafizadeh","doi":"10.22068/IJMSE.2105","DOIUrl":"https://doi.org/10.22068/IJMSE.2105","url":null,"abstract":"Solvent extraction of samarium from aqueous solutions by two different types of extractants, namely D2EHPA and PC88A, in kerosene was investigated. Through identification of speciation diagrams, the chemically stable complex of samarium in different acidic solutions (H2SO4, HCl and HNO3) were studied. Regarding the various types of samarium species in sulfate medium in comparison with other acidic environments, H2SO4 and HNO3 media were chosen to examine the extraction behavior of samarium complexes. Thermodynamic parameters of samarium extraction reactions by D2EHPA and PC88A from aqueous solutions of HNO3 and H2SO4 were calculated as ∆G°D2EHPA-HNO3 , ∆G°D2EHPA-H2SO4 , ∆G°PC88A-HNO3 , ∆G°PC88A-H2SO4 equal to -5.58, 3.40, 6.70 and 14.26, and the corresponding ΔHo values were equal to -9.38, -2.75, 4.01 and 16.95 kJ/mol, respectively. According to the results, D2EHPA seemed to be a more efficient extractant than PC88A and nitric aqueous solution was a better media than the sulfuric type. The synergistic effect of binary extractants revealed that synergistic factors were 2.94 and 5.74 in sulfuric and nitric solutions, respectively, for a D2EHPA:PC88A ratio of 2:3. The compositions of extracted complexes by D2EHPA and PC88A in sulfuric and nitric solutions were SmH3A6 and SmH3B6, respectively. Thermodynamic parameters of extraction reactions were calculated as: Ke equal to 9.513, 0.254, 0.067, 0.003 and ∆S°D2EHPA-HNO3 , ∆S°D2EHPA-H2SO4 , ∆S°PC88A-HNO3 , ∆S°PC88A-H2SO4 values were equal to -12.75, -20.64, -9.03, and 9.03 (J mol-1) respectively.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44434060","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}

引用次数: 0

Manufacturing and Structural Evaluation of Polymer Derived SiOC/TiC and SiOC/TiC/mullite Nanocomposites 聚合物衍生SiOC/TiC和SiOC/TiC/莫来石纳米复合材料的制备及结构评价

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Iranian Journal of Materials Science and Engineering Pub Date : 2021-09-10 DOI: 10.22068/IJMSE.2093

Amirhosein Paryab, Toktam Godary, S. Abdollahi, Mohsen Anousheh, A. M. Khachatourian

引用次数: 1

Rheological Comparison of Silicone Rubber Crosslinking with Platinum Catalysts and Triethylamine, Methanol & Ethanolamine Solvents 硅橡胶与铂催化剂及三乙胺、甲醇和乙醇胺溶剂交联的流变性比较

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Iranian Journal of Materials Science and Engineering Pub Date : 2021-06-10 DOI: 10.22068/IJMSE.2067

R. W. Sharudin, N. Azmi, Muhammad Shafiq Mat Shayuti, M. Ohshima

{"title":"Rheological Comparison of Silicone Rubber Crosslinking with Platinum Catalysts and Triethylamine, Methanol & Ethanolamine Solvents","authors":"R. W. Sharudin, N. Azmi, Muhammad Shafiq Mat Shayuti, M. Ohshima","doi":"10.22068/IJMSE.2067","DOIUrl":"https://doi.org/10.22068/IJMSE.2067","url":null,"abstract":"The control of silicone rubber’s viscoelastic properties such as loss factor, storage and loss moduli at crosslinking stage is crucial in their malleability. Hence, the objective in this study is to investigate the rheological behaviour of silicone rubber cured under different formulation using platinum catalysts and triethylamine, methanol & ethanolamine solvents. Measurements were conducted for the silicone rubber to cross-linker ratios of 2.5:7.5, 5:5, 7.5:2.5 and 10:1 at different temperatures, as well as for the silicone rubber with triethylamine, methanol and ethanolamine at different angular frequencies. The crossover of storage and modulus curve which signifies a gel point was not observed at higher ratios of platinum used across the temperature range of 25 – 100°C. However, the crossover was observed at 89 and 95°C with the formulation ratios of 10:1 and 7.5:2.5, respectively. On the other hand, the crossover point was observed for silicone rubber at 100 s-1 for triethylamine, 3 s-1 and 100 s-1 for methanol, and 70 s-1 alongside 290 s-1 for ethanolamine. The presence of gel point indicates that crosslinking of silicone rubber and this study proves the possibility of controlling the crosslinking behaviour..","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48122449","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}

引用次数: 1

Multicrystalline Materials Analysis Based on Their Microstructure with Emphasis on Predicting Forming Limit Diagrams 基于微观结构的多晶材料分析——着重预测成形极限图

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Iranian Journal of Materials Science and Engineering Pub Date : 2021-06-10 DOI: 10.22068/IJMSE.1753

Sedigeh Mohamadnejad Zanjani, A. Basti, R. Ansari

引用次数: 0

The Effect of Temperature on the Purity of Nano-Scale Tantalum Powder Produced from Its Scrap by Reaction with Magnesium and Calcium 温度对用钽废料与镁、钙反应制备纳米钽粉纯度的影响

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Iranian Journal of Materials Science and Engineering Pub Date : 2021-06-10 DOI: 10.22068/IJMSE.2006

G. Borhani, S. Bakhshi, Sadegh Soltani

引用次数: 0

Optimization of Parameters for the Friction Stir Processing and Welding of AA1050 Aluminum Alloy AA1050铝合金搅拌摩擦加工与焊接工艺参数优化

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Iranian Journal of Materials Science and Engineering Pub Date : 2021-06-10 DOI: 10.22068/IJMSE.2016

Mahdi Alishavandi, M. Ebadi, A. Kokabi

引用次数: 4

Influence of Heat Treatment on the AA6061 and AA6063 Aluminum Alloys Behavior at Elevated Deformation Temperature 热处理对AA6061和AA6063铝合金高温变形行为的影响

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Iranian Journal of Materials Science and Engineering Pub Date : 2021-06-10 DOI: 10.22068/IJMSE.1890

M. Mohammadi, H. R. Ashtiani

引用次数: 2

Influence of Silicon Additions on Microstructure and Mechanical Properties of Manganese Bronze Alloys 硅添加量对锰青铜合金组织和力学性能的影响

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Iranian Journal of Materials Science and Engineering Pub Date : 2021-06-10 DOI: 10.22068/IJMSE.2063

Prabhakar Kuppahalli, R. Keshavamurthy, P. Sriram, Ahobal Narayana

{"title":"Influence of Silicon Additions on Microstructure and Mechanical Properties of Manganese Bronze Alloys","authors":"Prabhakar Kuppahalli, R. Keshavamurthy, P. Sriram, Ahobal Narayana","doi":"10.22068/IJMSE.2063","DOIUrl":"https://doi.org/10.22068/IJMSE.2063","url":null,"abstract":"The present investigation aims to synthesize RB031, RB032 Manganese Bronze alloys equivalent to HTB1 and HTB2 alloys with the addition of silicon and to characterize them with the help of Microstructure and Mechanical properties. The methodology involves melting of alloys in a 300kg coreless medium frequency induction furnace, casting them in Permanent and Shell molds with optimum values of Zinc equivalent and retaining their high mechanical properties. The study includes the development and mechanical property measurements of the alloys synthesized. Characterization has been carried out using optical microscopy and scanning electron microscopy with EDAX analysis for investigation of compositional variations and inquisition of hardness measurement & tensile properties. It is concluded from this work that RB032 alloy cast in Permanent molds has superior hardness and tensile properties compared to Shell molds which far exceeds that of NAB (AB2) alloys processed under similar conditions. Further, this investigation includes grain refinement by suitable Heat treatment studies to combat hot tearing since the strength is adequate enough with RB032 exhibiting higher hardness than other two alloys.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47659754","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}

引用次数: 1

Structural and Morphological Characterization of the Expanded Graphite Obtained by Ball Milling and HF Leaching 球磨和HF浸出膨胀石墨的结构和形态表征

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Iranian Journal of Materials Science and Engineering Pub Date : 2021-06-10 DOI: 10.22068/IJMSE.2131

S. Karimi, A. Heidarpour, S. Ghasemi

引用次数: 0

The Response of GFRP Nanocomposites Reinforced with Functionalized SWCNT Under Low Velocity Impact: Experimental and LS-DYNA Simulation Investigations 功能化SWCNT增强GFRP纳米复合材料在低速冲击下的响应：实验和LS-DYNA模拟研究

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Iranian Journal of Materials Science and Engineering Pub Date : 2021-06-10 DOI: 10.22068/IJMSE.1985

M. Maghsoudlou, R. Isfahani, S. Saber-Samandari, M. Sadighi

{"title":"The Response of GFRP Nanocomposites Reinforced with Functionalized SWCNT Under Low Velocity Impact: Experimental and LS-DYNA Simulation Investigations","authors":"M. Maghsoudlou, R. Isfahani, S. Saber-Samandari, M. Sadighi","doi":"10.22068/IJMSE.1985","DOIUrl":"https://doi.org/10.22068/IJMSE.1985","url":null,"abstract":": The low velocity impact (LVI) response of a pure and glass fiber reinforced polymer composites (GFRP) with 0.1, 0.3 and 0.5 wt.% of functionalized single-walled carbon nanotubes (SWCNTs) was experimentally investigated. LS-DYNA simulation was used to model the impact test of pure and incorporated GFRP with 0.3 wt. % of SWCNT in order to compare experimental and numerical results of LVI tests. All tests were performed at two different levels of energy. At 30J energy, the specimen containing 0.5 wt. % SWCNT was completely destructed. The results showed that the incorporated GFRP with 0.3 wt. % SWCNT had the highest energy absorption and the back-face damage area of this sample was smaller than other specimens. TEM images from specimens were also analyzed and showed the incorporation of well-dispersed 0.1 and 0.3 wt. % of SWCNT, while in specimens containing 0.5 wt.% of CNT, tubes tended to be agglomerated causing a drop in the LVI response of the specimen. The contact time of the impactor in numerical and experimental results was approximately equal. However, as the conditions in numerical modeling are considered ideal, the maximum contact forces in LS DYNA simulation results were higher than the experimental results.","PeriodicalId":14603,"journal":{"name":"Iranian Journal of Materials Science and Engineering","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2021-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41284309","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}

引用次数: 13