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Novel and Facile Synthesis of Nano SnO2 with Various Morphologies by Electric Current Stressing 电流应力法合成不同形貌纳米SnO2的新方法
IF 0.7 4区 材料科学
稀有金属材料与工程 Pub Date : 2018-09-01 DOI: 10.1016/S1875-5372(18)30203-0
Li Wangyun, Cao Shanshan, Zhang Xinping
{"title":"Novel and Facile Synthesis of Nano SnO2 with Various Morphologies by Electric Current Stressing","authors":"Li Wangyun,&nbsp;Cao Shanshan,&nbsp;Zhang Xinping","doi":"10.1016/S1875-5372(18)30203-0","DOIUrl":"10.1016/S1875-5372(18)30203-0","url":null,"abstract":"<div><p>Nano tin oxide (SnO<sub>2</sub>) was synthesized by a novel, fast and facile approach through applying electric current of high density to a line-type joint specimen consisting of a high tin-content alloy between two pieces of conductor (copper or nickel). The fabricated SnO<sub>2</sub> shows various morphologies, such as branch-like, pine-leaf-like, grass-like and batting-like, and has the tetragonal rutile structure confirmed by scanning electron microscopy, energy dispersive X-ray spectroscope and Raman spectrum. The present work has not only offered a facile and novel method for fabricating SnO<sub>2</sub> of various morphologies, but also provided an inspiriting yet practical idea as well as technical possibilities for preparation of other functional oxide materials.</p></div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 9","pages":"Pages 2647-2651"},"PeriodicalIF":0.7,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30203-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89885998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Effect of Rare Earth Oxide Addition on the Microstructure and Properties of Ultrafine Grain W-20Cu Composites 稀土氧化物添加对W-20Cu超细晶复合材料组织和性能的影响
IF 0.7 4区 材料科学
稀有金属材料与工程 Pub Date : 2018-09-01 DOI: 10.1016/S1875-5372(18)30199-1
Chen Huipei , Cheng Jigui , Zhang Minglong , Chen Wenchao , Wei Bang-zheng , Chen Pengqi , Luo Laima , Wu Yucheng
{"title":"Effect of Rare Earth Oxide Addition on the Microstructure and Properties of Ultrafine Grain W-20Cu Composites","authors":"Chen Huipei ,&nbsp;Cheng Jigui ,&nbsp;Zhang Minglong ,&nbsp;Chen Wenchao ,&nbsp;Wei Bang-zheng ,&nbsp;Chen Pengqi ,&nbsp;Luo Laima ,&nbsp;Wu Yucheng","doi":"10.1016/S1875-5372(18)30199-1","DOIUrl":"10.1016/S1875-5372(18)30199-1","url":null,"abstract":"<div><p>Ultrafine W-20wt%Cu (W-20Cu) powders doped with 0 wt%∼0.8 wt% rare earth oxides Ce<sub>0.8</sub>Sm<sub>0.2</sub>O<sub>1.9</sub> (SDC) were synthesized by the EDTA-citrate method using ammonium metatungstate and copper nitrate as raw materials, and the resultant powders were pressed and sintered at 1250 °C in H<sub>2</sub> atmosphere for 2 h to obtain SDC/W-20Cu composites. Morphology of the SDC/W-20Cu powders and microstructure of the sintered SDC/W-20Cu composites were observed by SEM, and density, physical and mechanical property of sintered SDC/W-20Cu composites were also tested to investigate the influence of rare earth addition. The results show that the SDC/W-20Cu powders are irregular in shape with particle size ranging from 100 nm to 200 nm. The addition of SDC has slight influence on the electrical conductivity, but obviously refines the grain size and improves the mechanical properties of the W-20Cu composites. The sintered SDC/W-20Cu samples have relative density above 97%. Bending strength and micro-hardness HV of the SDC/W-20Cu specimens are 1128 MPa and 3180 MPa with the addition of 0.6 wt% SDC, respectively, and the highest tensile strength reaches 580 MPa and 258 MPa at room temperature and 600°C, respectively.</p></div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 9","pages":"Pages 2626-2630"},"PeriodicalIF":0.7,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30199-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87561688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Influence of Si on Microstructures and High-Temperature Properties of MCrAlY Type Coating Si对mccraly型涂层组织和高温性能的影响
IF 0.7 4区 材料科学
稀有金属材料与工程 Pub Date : 2018-09-01 DOI: 10.1016/S1875-5372(18)30204-2
Zhang Shuting , Du Kaiping , Ren Xianjing , Shi Ji
{"title":"Influence of Si on Microstructures and High-Temperature Properties of MCrAlY Type Coating","authors":"Zhang Shuting ,&nbsp;Du Kaiping ,&nbsp;Ren Xianjing ,&nbsp;Shi Ji","doi":"10.1016/S1875-5372(18)30204-2","DOIUrl":"10.1016/S1875-5372(18)30204-2","url":null,"abstract":"<div><p>The CoCrAlSiY alloy coating with Si mass concentrations of 0%, 2% and 5% was prepared. The effect of Si element on the structure and properties of the alloy powder and coating was analyzed. In addition, the function of Si element on the high temperature performance of the coating was also discussed. The results show that the Si element is mainly distributed in the <em>β</em> phase, whose volume content and distribution have a great influence on the high temperature performance of the coatings. Furthermore, the Si element promotes the change from internal oxidation to external oxidation of the alloy and the formation of the protective oxide film. However, the much higher Si content results in a higher PBR (Pilling-Bed worth ratio) value of the oxide film, and increases the oxide film stress, which is not beneficial to the improvement of the coating thermal shock resistance at high temperatures.</p></div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 9","pages":"Pages 2652-2656"},"PeriodicalIF":0.7,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30204-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90997126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
AlN/Ga-based Liquid Metal/PDMS Ternary Thermal Grease for Heat Dissipation in Electronic Devices 电子器件散热用AlN/ ga基液态金属/PDMS三元导热润滑脂
IF 0.7 4区 材料科学
稀有金属材料与工程 Pub Date : 2018-09-01 DOI: 10.1016/S1875-5372(18)30207-8
Liu Han, Liu Huiqiang, Lin Zuoye, Chu Sheng
{"title":"AlN/Ga-based Liquid Metal/PDMS Ternary Thermal Grease for Heat Dissipation in Electronic Devices","authors":"Liu Han,&nbsp;Liu Huiqiang,&nbsp;Lin Zuoye,&nbsp;Chu Sheng","doi":"10.1016/S1875-5372(18)30207-8","DOIUrl":"https://doi.org/10.1016/S1875-5372(18)30207-8","url":null,"abstract":"<div><p>A new composite thermal interface material (TIM) was synthesized by combining AlN with liquid metal (LM, Ga<sub>68.5</sub>In<sub>21.5</sub>Sn<sub>10</sub>) and polydimethylsiloxane (PDMS), one of the most commonly used silicone oils, to enhance the interfacial heat transfer. The microstructure and chemical composition of the material were analyzed using scanning electron microscopy (SEM) with an energy dispersive spectrometer (EDS) to investigate its principle of heat dissipation. The thermal conductivity (<em>κ</em>) of the AlN liquid metal thermal grease (ALTG) was found to be 5.014 W/m·K, higher than that of a liquid metal/PDMS composite (LMTG) and higher than that of one of the best existing thermal grease products (X23-7762) by approximately 5% and 20%, respectively. Meanwhile, the thermal contact resistance (<em>R</em>) was reduced by 20% and 50%, respectively, and the viscosity remained in an appropriate range, reducing the risks of overflow during usage. An actual test on a CPU showed that ALTG could significantly reduce the operating temperature. The thermal mechanism of ALTG was studied, and a synergistic effect was suggested for the heat transfer process. The results prove the ideal heat dissipation properties of TIMs and their wide application prospects in industry.</p></div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 9","pages":"Pages 2668-2674"},"PeriodicalIF":0.7,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30207-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91732948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 10
AlN/Ga-based Liquid Metal/PDMS Ternary Thermal Grease for Heat Dissipation in Electronic Devices 电子器件散热用AlN/ ga基液态金属/PDMS三元导热润滑脂
IF 0.7 4区 材料科学
稀有金属材料与工程 Pub Date : 2018-09-01 DOI: 10.1016/S1875-5372(18)30207-8
Liu Han, L. Huiqiang, Lin Zuoye, Chu Sheng
{"title":"AlN/Ga-based Liquid Metal/PDMS Ternary Thermal Grease for Heat Dissipation in Electronic Devices","authors":"Liu Han, L. Huiqiang, Lin Zuoye, Chu Sheng","doi":"10.1016/S1875-5372(18)30207-8","DOIUrl":"https://doi.org/10.1016/S1875-5372(18)30207-8","url":null,"abstract":"","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"35 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74226457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Biocompatible MgO Film on Titanium Substrate Prepared by Sol-gel Method 溶胶-凝胶法制备钛基生物相容性MgO膜
IF 0.7 4区 材料科学
稀有金属材料与工程 Pub Date : 2018-09-01 DOI: 10.1016/S1875-5372(18)30206-6
Yu Shunzhi , Li Zhonghai , Han Liwei , Zhao Yantao , Fu Tao
{"title":"Biocompatible MgO Film on Titanium Substrate Prepared by Sol-gel Method","authors":"Yu Shunzhi ,&nbsp;Li Zhonghai ,&nbsp;Han Liwei ,&nbsp;Zhao Yantao ,&nbsp;Fu Tao","doi":"10.1016/S1875-5372(18)30206-6","DOIUrl":"https://doi.org/10.1016/S1875-5372(18)30206-6","url":null,"abstract":"<div><p>MgO film was prepared by a sol-gel method on titanium substrate for bioactive and antibacterial surface modification of osteo-implants. X-ray diffraction analysis shows that the gel film can be crystallized by the calcination at 400 °C. The MgO film is converted to Mg(OH)<sub>2</sub> after ageing in air. The film is crack-free observed with scanning electron microscopy, and exhibits bioactivity by inducing the formation of apatite layer in the simulated body fluid test. It is also biocompatible with osteoblast cells and slightly antibacterial against E. Coli. The sol-gel MgO film would provide a facile surface modification method for biomedical titanium implants.</p></div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 9","pages":"Pages 2663-2667"},"PeriodicalIF":0.7,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30206-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91691414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Microstructure and Superconductivity of Bi-2223 Tape Prepared by Precursor Powders with Different Particle Sizes 不同粒径前驱体粉末制备Bi-2223带的微观结构和超导性
IF 0.7 4区 材料科学
稀有金属材料与工程 Pub Date : 2018-09-01 DOI: 10.1016/S1875-5372(18)30209-1
Cui Lijun , Zhang Pingxiang , Li Jinshan , Yan Guo , Feng Yong , Liu Xianghong , Li Jianfeng , Pan Xifeng , Zhang Shengnan , Ma Xiaobo , Liu Guoqing
{"title":"Microstructure and Superconductivity of Bi-2223 Tape Prepared by Precursor Powders with Different Particle Sizes","authors":"Cui Lijun ,&nbsp;Zhang Pingxiang ,&nbsp;Li Jinshan ,&nbsp;Yan Guo ,&nbsp;Feng Yong ,&nbsp;Liu Xianghong ,&nbsp;Li Jianfeng ,&nbsp;Pan Xifeng ,&nbsp;Zhang Shengnan ,&nbsp;Ma Xiaobo ,&nbsp;Liu Guoqing","doi":"10.1016/S1875-5372(18)30209-1","DOIUrl":"10.1016/S1875-5372(18)30209-1","url":null,"abstract":"<div><p>The effects of particle size of precursor powders on microstructure and superconductivity of Bi-2223 tape were investigated. Three kinds of precursor powders with different particle sizes (8, 2, &lt;1 μm) were prepared by a spray pyrolysis method via adjusting the concentration of metal nitrates solution and ball milling. All powders were composed of Bi-2212, (Sr, Ca)<sub><em>x</em></sub>Cu<sub><em>y</em></sub>O<sub><em>δ</em></sub> (AEC) and CuO phase after heat treatment. Results show that AEC phase dimension and content increase with decreasing of particle size of the precursor powders. However, the powder with an average particle size of 2 μm has the minimal dimension and content of CuO phase. Among the 37-filaments Bi-2223 tapes fabricated from the three kinds of precursor powders, the one from the powder with average particle size of 2 μm achieves the highest critical current (<em>I</em><sub>c</sub>), which also has the most (Bi, Pb)<sub>3</sub>Sr<sub>2</sub>Ca<sub>2</sub>CuO<sub><em>x</em></sub> (Pb-3221) and least AEC phase compared to other tapes. The particle size of the precursor powders mainly affects dimension and content of AEC and CuO phase, which further causes difference of <em>I</em><sub>c</sub> and non-superconducting phases in Bi-2223 tape.</p></div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 9","pages":"Pages 2682-2686"},"PeriodicalIF":0.7,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30209-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85558056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Assessment of Stray Grain Formation in Weld Joint of Single Crystal Molybdenum by ANSYS FE Simulation 单晶钼焊接接头杂散晶粒形成的ANSYS有限元模拟
IF 0.7 4区 材料科学
稀有金属材料与工程 Pub Date : 2018-09-01 DOI: 10.1016/S1875-5372(18)30198-X
Ma Yan, Xu Yanze, Wang Jianju
{"title":"Assessment of Stray Grain Formation in Weld Joint of Single Crystal Molybdenum by ANSYS FE Simulation","authors":"Ma Yan,&nbsp;Xu Yanze,&nbsp;Wang Jianju","doi":"10.1016/S1875-5372(18)30198-X","DOIUrl":"10.1016/S1875-5372(18)30198-X","url":null,"abstract":"<div><p>Stray grains were observed in an electron beam welded (EBW) joint of single crystal molybdenum (Mo) in former studies. In the present paper, finite element (FE) method, combining the theoretical analysis, was used for evaluating the stray grain formation. Temperature-dependent thermal properties of molybdenum were incorporated in the model and a 3D volumetric moving double-ellipsoid heat source was applied. The relationship of parameter <em>Φ</em>, describing the degree of stray grain formation, to the thermal gradient <em>G</em> and the growth velocity <em>V</em> was used. Temperature and thermal gradient data of the model were extracted from simulation results under different operating conditions, and <em>Φ</em> was calculated. The effects of the welding parameters, including welding power <em>Q</em> and welding speed <em>S</em> on the formation of the weld stray grain were obtained.</p></div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 9","pages":"Pages 2621-2625"},"PeriodicalIF":0.7,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30198-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80858590","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Surface Nanocrystallization of 7A52 Aluminum Alloy Welded Joint by Aging and Ultrasonic Impact Compound Treatment 时效与超声冲击复合处理7A52铝合金焊接接头表面纳米化
IF 0.7 4区 材料科学
稀有金属材料与工程 Pub Date : 2018-09-01 DOI: 10.1016/S1875-5372(18)30201-7
Chen Chao, Chen Furong, Zhang Huijing
{"title":"Surface Nanocrystallization of 7A52 Aluminum Alloy Welded Joint by Aging and Ultrasonic Impact Compound Treatment","authors":"Chen Chao,&nbsp;Chen Furong,&nbsp;Zhang Huijing","doi":"10.1016/S1875-5372(18)30201-7","DOIUrl":"10.1016/S1875-5372(18)30201-7","url":null,"abstract":"<div><p>Welding joint of 7A52 aluminum was treated by ultrasonic impact technology (UIT) and a combined treatment of aging and ultrasonic impact (A-UIT). The effects of different treatments on the microstructure and properties of the welded joint were compared and analyzed, especially the effects of A-UIT on microstructure and the mechanism of surface hardening of welded joint. The results show that the nanometer grain layer can be successfully prepared by UIT and A-UIT on the surface of aluminum alloy welded joint. From the comparison, it can be found that the surface grain size, surface microhardness and matrix microhardness of the welded joint after A-UIT are significantly higher than those of the welded joint after UIT, which exhibits a better reinforcement. The surface hardening mechanism of welded joints after UIT is fine-grained strengthening, while that of welded joints after A-UIT is fine-grained and precipitated strengthening, which is different from that of UIT.</p></div>","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"47 9","pages":"Pages 2637-2641"},"PeriodicalIF":0.7,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1875-5372(18)30201-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81397372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Effects of Point Defects on Properties of B2 NiAl: A First-principles Study 点缺陷对B2 NiAl材料性能影响的第一性原理研究
IF 0.7 4区 材料科学
稀有金属材料与工程 Pub Date : 2018-09-01 DOI: 10.1016/S1875-5372(18)30210-8
Niu Xiaofeng, Huang ZhiWei, Wang Baojian, Wang Chenchen, Song Zhenliang
{"title":"Effects of Point Defects on Properties of B2 NiAl: A First-principles Study","authors":"Niu Xiaofeng, Huang ZhiWei, Wang Baojian, Wang Chenchen, Song Zhenliang","doi":"10.1016/S1875-5372(18)30210-8","DOIUrl":"https://doi.org/10.1016/S1875-5372(18)30210-8","url":null,"abstract":"","PeriodicalId":21056,"journal":{"name":"稀有金属材料与工程","volume":"6 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90304126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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