共搜索到21661条信息,每页显示10条信息,共2167页。用时:0小时0分0秒619毫秒
solidification experiment is carried out. The influence of morphology and length scale of the microstructure on microhardness is also analyzed. Key words: Sn-Sb monophasic alloy; directional solidification... microstructures of alloy investigated in this work The microstructure of the monophasic Sn-2%Sb alloy is characterized by a Sn-rich matrix of either cellular or dendritic morphologies, as shown in Fig. 7......
......
Sb含量对Sn-Sb合金焊料电化学腐蚀行为的影响郝煜辉1,王容岳1,袁章福1,王存21. 北京科技大学钢铁共性技术协同创新中心2. 北京奥邦新材料有限公司摘 要:为了评估Sn-Sb合金焊料的电化学可靠性,以Sn-xSb(x=0.5%,3%,5%,10%,质量百分数)合金为工作电极,Pt片为对电极,饱和甘汞电极(SCE,饱和KCl溶液)为参比电极,中性5%NaCl溶液为腐蚀溶液,采用电化学腐蚀试验方法,研究了Sb含量对Sn-Sb合金焊料的电化学腐蚀行为的影响.通过对合金样品的动电位极化曲线和电化学交流阻抗谱(EIS)的分析,得出Sn-Sb合金焊料耐腐蚀性下降的趋势为Sn-10Sb> Sn-5Sb> Sn-3Sb> Sn-0.5Sb.关键词:Sn-Sb合金;NaCl;电化学......
Sn-Sb15无铅焊料熔体结构转变及其对凝固和润湿性的影响董野峰,李先芬,祖方遒,刘兰俊,赵雪梅合肥工业大学材料科学与工程学院摘 要:在高达1 200℃的范围内,通过直流四电极法研究了Sn-Sb15无铅焊料合金在液相线以上一定温度范围内发生熔体结构转变的可能性及规律,并以此为切入点研究了熔体结构转变前后焊料的凝固组织和润湿性能的变化规律.研究表明:Sn-Sb15合金熔体发生了温度诱导的液态结构转变;这种转变细化了凝固组织,改善了Sn-Sb合金钎料的润湿性能.关键词:Sn-Sb无铅焊料;电阻率;润湿性;凝固;......
The Strengthening of Cu-15Ni-8Sn Alloy WANG Ming-Pu1,WANG Yan-hui1,HONG Bin1 (1.School of Material Science and Engineering, Central South University, Changsha China) 摘要:The microstructure, property and relation between them of Cu-15Ni-8Sn alloy are studied by means of TEM and the measurement of hardness. The results show that γ '' metastable phase strengthens alloy because of its ordering......
The Technological Improvements of Aluminum Alloy Coloring by Electrolysis LI Nai-jun1 (1.Teachers College, Shenyang University, Shenyang 110015, P. R. China) 摘要:The technological process of coloring golden-tawny on aluminum alloy by electrolysis was improved in this paper. The optimum composition of electrolyte was found, the conditions of deposition and anodic oxidation by electrolysis were......
Ag-Pd和Ni对无铅钎料焊点形状,微结构及剪切强度的影响 盛玫1,肖克来提1,罗乐1 (1.中国科学院上海冶金研究所-戴姆勒克莱斯勒中德联合电子封装研究实验室,上海,200050) 摘要:研究了器件端头两种不同的金属化层(Ag-Pd和Ni/Ag-Pd)对Sn-Sb钎料表面贴装焊点的形状,微结构及剪切强度的影响,并与常用的Sn-Pb-Ag钎料焊点进行了比较结果表明:Sn-Sb/Ag-Pd焊点由于Sn-Sb钎料与Ag-Pd层在回流焊接过程中的剧烈反应导致钎料在器件端头区域集中而不在Cu焊盘上充分铺展,焊点强度低,断裂发生在原Ag-Pd/陶瓷界面;Sn-Sb/Ni/Ag-Pd焊点中Ni有效地阻止了Ag-Pd在钎料中的溶解,焊点形状理想,强度很高;而对于Sn-Pb Ag钎料,器件金属化层对焊点形状和强度影响不大,剪切测试后,断裂发生在钎料内部 关键词:Sn-Sb钎料; 器件端头金属化层......
Microstructure and Performances of Nanocrystalline Zinc-nickel Alloy Coatings LI Guang-yu1,NIU Li-yuan1,JIANG Zhong-hao1,LIAN Jian-she1 (1.The Key Lab of Automobile Materials, Ministry of Education, China, College of Materials Science and Engineering, Jilin University, Nanling Campus, Changchun, 130025, China) 摘要:Nanocrystalline zinc-nickel alloy coatings were deposited from an alkaline......
Alloy 20不锈钢薄板等离子弧焊接工艺研究赵斌,王宾宾,王小华中国船舶重工集团公司第七二五研究所摘 要:对Alloy 20不锈钢薄板进行了等离子弧焊接工艺试验研究.结果表明,采用等离子弧焊接方法,ERCr Ni Mo-3焊材及合理的焊接工艺参数,等离子弧焊接工艺可用于Alloy 20不锈钢薄板的焊接,焊接接头各项性能均能满足要求.关键词:Alloy 20;不锈钢薄板;等离子弧焊接;......
火焰原子吸收光谱法测定锡基合金中痕量银张利群1,王晓辉1,陆翌欣1,王明海1,肖政1(1.北京市钢铁研究总院)摘 要:采用HCl和HNO3溶解样品,建立了火焰原子吸收光谱法测定锡基合金中银的方法.考察了不同的盐酸,硝酸用量对Ag+回收率的影响,试验结果表明:当溶液中Ag+浓度在0.1~20μg/mL,加入10~20 mL HCl,3 mL HNO3时,Ag+与Cl-络合得最完全,生成[AgCl4]3-,回收率在98.6%~107.1%之间,实验选择加入10 mL HCl和3 mL HNO3溶解样品.样品中的铜离......