电子组装用SnAgCu系无铅钎料合金与性能

论述无铅钎料替代的紧迫性,综述无铅钎料的发展现状,特别讨论了以SnAgCu三元系合金为代表的无铅钎料的特点与优势。SnAgCu三元钎料合金在一个较大成分范围熔化温度都接近共晶温度,在SnAgCu钎料合金中添加微量La、Ce混合稀土,构成新的四元合金,既能保持SnAgCu钎料的优良物理性能及钎焊工艺性能,又能显著提高SnAgCu合金的抗蠕变性能及服役可靠性,同时钎料成本低廉,具有自主知识产权,在钎料的生产和使用上将免于国外专利的困扰,为国内钎料生产企业提供了有竞争性的无铅焊料合金。另外,采用微米／亚微米颗粒,可进一步增强无铅钎料的抗蠕变性能及组装接头的尺寸稳定性,可满足光通讯、宇航、汽车等电子设备制造的特殊要求。     

TiFe_（0．86）Mn_（0．1）／L－沸石热力学和动力学性能研究

对ＴｉＦｅ＿０．８６Ｍｎ＿０．１／Ｌ－沸石包合物的热力学和动力学性能进行了研究，与ＴｉＦｅ＿０．８６Ｍｎ＿０．１比较发现，两者的热力学性能存在着明显的差异而动力学控制步骤相同，均受成核及长大控制。复合储氢材料的研究是寻找新型储氢材料、改善性能的有效途径。利用沸石和ＴｉＦｅ＿０．８６Ｍｎ＿０．１合金的特性制备的ＴｉＦｅ＿０．８６Ｍｎ＿０．１／Ｌ－沸石包合物是一种不同于单一合金的复合材料￣［１］。作为储氢材料，其热力学和动力学性能在实际应用和理论研究中是极为重要的。对于ＬａＮｉ＿５体系，许多作者报道过其动力学方面的特性及反应机理￣［２．３．４］，Ｈ．Ｓ．ＣｈｕｎｇａｎｄＪ．Ｙ．Ｌｅｅ￣［５］对ＴｉＦｅ基合会的动力学也进行了研究。热大学研究同样受到人们的重视。本文主要讨论ＴｉＦｅ＿０．８６Ｍｎ＿０．１／Ｌ－沸石的热力学及动力学性能     

硅对Cu—Ag合金性能的影响

系统地研究添加Si≤10％对Cu-Ag合金力学、冶金学、物理学诸方面性能的影响。结果表明，随着Si添加量增加Cu-Ag合金硬度提高，但影响程度随合金中Ag含量增加而减弱。合金的密度随着Si添加量增加呈线性降低，电阻率则呈线性升高。Ag≤50％的Cu-Ag合金，添加Si可显降低合金的液相线温度，缩小合金固－液相线温度区间，对提高钎料合金的铺展性和间隙填充性具有重要意义。     

低电阻Cu－Be弹性合金

电子工业用的低电阻Ｃｕ－Ｂｅ弹性合金含有量０．２５％～０．７２％Ｂｅ，１．３％～１．５％Ｎｉ，余量为Ｃｕ．采用真空熔炼非真空浇注，热开坯，冷加工制成板材。经过８６０～９００℃淬火，进行４０％的冷加工，在４００～８０℃，时效２．５ｈ后，合金获得下列性能：电阻率４．０６～４．２７×１０￣（－５）Ω·ｃｍ，弹性模量１２０５４０～１３７２００Ｐａ，抗拉强度５１４～７８９ＭＰａ，延伸率１４～３４，硬度Ｈｖ＝１６０～２３０．     

Ni含量对Sn-0.7Cu无铅钎料钎焊性能的影响

本文以Sn-0.7Cu无铅钎料为基础,以改善二元Sn-Cu钎料合金的性能为目标,研究了Ni含量对Sn-0.7Cu钎料合金组织和性能的影响。通过组织观察、力学性能测试、熔化特性测试、润湿性能测试、电阻率测试、耐腐蚀性测试、时效处理等,研究了Ni含量对Sn-0.7Cu-xNi(x=0.5, 1.0, 1.5, 2.0)钎料合金凝固行为和钎焊性能的影响规律。结果表明：随着Ni含量添加,金属间化合物相(Ni3Sn4)体积分数逐渐增大,Ni含量为2%时,硬度最大值为14.2 HV;Ni含量为0.5%时,熔程最小为4.4 ℃;Ni含量为1%时,铺展面积最大值为92.4 mm2;在Ni含量为2%时,电阻率最大为1.1x10-7 Ω·m;IML厚度随着时效时间的延长先增加后趋于均匀;在Ni含量为2%时,钎料在酸性腐蚀条件下最稳定。     

Bi对Sn-Zn基无铅钎料合金组织与性能的影响

在Sn-(5～9)Zn二元钎料合金中加入1%～3%的Bi,研究Sn-Zn-Bi三元钎料合金的组织、熔化特性及润湿性.在Sn-Zn二元钎料合金结晶过程中,Sn-(5～7)Zn二元钎料合金形成富β-Sn的初生相,随着Zn量的增加,Sn-Zn二元钎料合金形成富Zn的初生相.添加Bi明显改善了钎料合金的润湿性能,当Bi添加量为3%时改善效果最好.另外,对钎料合金进行差热分析发现少量Bi的添加对Sn-Zn系钎料合金的熔点和熔程没有明显的影响.     

C/C复合材料用Ti-Cu合金钎料的试验研究

通过铺展实验研究Ti-Cu合金钎料中Ti含量对合金钎料润湿性的影响,试验结果表明,当Ti的质量分数为12%～16%时,合金钎料对C/C复合材料坯体有好的润湿性.用Ti-Cu合金钎料对C/C复合材料进行真空钎焊,研究钎焊接头的组织成分及分布.结果表明,钎料层与C/C复合材料结合紧密,Ti在钎料层与C/C复合材料的界面处富集并形成TiC,同时对Ti-Cu合金钎料的润湿性机理进行了分析.     

锡的添加对TiAl基合金的影响

研究了Ｓｎ的添加对Ｔｉ－３４ｗｔ％Ａｌ合金的室温力学性能、显微组织、相组成和断口形貌的影响。试验发现，在ＴｉＡｌ基合金中添加Ｓｎ，能够使合金室温延性得到提高，还发现，添加１．１４ｗｔ％Ｓｎ，使合金的层状组织呈较细的等轴晶，晶界光滑且较宽，合金表现出较好的室温综合力学性能，断口形貌出现准解理特征。     

电感耦合等离子体－原子发射光谱法测定锆石精矿及氧化锆中的铪

研究了用电感耦合等离子体－原子发射光谱法（ＩＣＰ－ＡＥＳ）测定锆石精矿和氧化锆中铪，制定了准确和简便的分析方法．铪的测定下限为０．０１％．当锆石中氧化铪的含量为１．９０％时，测量相对标准价差为１．５％，加料回收率为９５％～１０２％；氧化锆中氧化铪为０．０３４％时，相对标准偏差为４．０％，加料回收率为９７％～１０２％．     

22SiMnNi2CrMoA钢制钎尾复合强韧化研究

研究了渗碳＋等温淬火及稀土－碳共渗＋等温淬火的复合强韧化处理对２２ＳｉＮｍＮｉ２ＣｒＭｏＡ钢组织和性能的影响。试验结果表明，用２２ＳｉＭｎＮｉ２ＣｒＭｏＡ钢制造凿岩机钎尾，采用上述复合强韧化处理工艺，其平均使用寿命较常规热处理提高５￣６倍。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

2014 second batch of rare earth quota released

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矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586