无铅软钎料的研究

为了适应未来电子工业对无毒、无铅钎料的要求，本文以Ｓｎ－Ｓｂ二元合金系为基础，开发出一种新的无毒、无铅系列软钎料。通过试验，筛选出Ｓｎ－４￣５Ｓｂ－１５￣２５Ｂｉ－２￣５Ａｇ合金系列，通过加入０．１％￣０．０１％Ｉｎ，０．８％￣０．１％Ｃｕ和０．１％￣０．０１％Ｎｉ等微量元素，达到改善合金的润湿性及抗蠕变性能的目的。     

萃取分离EDTA络合滴定法测定镓的研究

在ｐＨ４～５的条件下，以ＰＡＮ，ＥＤＴＡ－Ｃｕ作指标剂，在８０℃左右用ＥＤＴＡ直接滴定Ｇａ＾３＋终点敏锐，３００ｍｇＣｕ＾２＋，Ｆｅ＾３＋，Ｚｎ＾２＋，Ｃｄ＾２＋，Ｂｉ＾３＋，１００ｍｇＰｂ＾２＋，Ｉｎ＾３＋，Ｓｎ（Ⅳ）；６０ｍｇＡｌ＾３＋；４０ｍｇＧｅ＾４＋，３０ｍｇＳｂ（Ⅴ）Ｍｏ（Ⅵ）１ｍｇＡｕ＾３＋Ｔｌ＾３＋经萃取分离后不干扰测定，本法可用于含镓０．５％以上样中镓的测定。     

方波伏安法同时测定U_3O_8中Cu、Ph、Zn、Cd、Fe、Co、Ni、Mn

Ｕ３Ｏ８试样用硝酸分解后，用ＴＢＰ－ＣＣｌ４溶液萃取分离铀，水相用ＨＣｌＯ４蒸干，残渣溶于０．０５ｍｏｌ／Ｌ的ＨＣｌＯ４和０．０３ｍｏｌ／Ｌ的酒石酸混合底液中，用方波阳极溶出伏安法测定Ｃｕ、Ｐｂ、Ｚｎ、Ｃｄ，然后用氨水调节ｐＨ为９．５，用方波极谱法测定Ｆｅ、Ｍｎ，最后加入２０μＬ丁二酮肟用络合物吸附波催化方波极谱法测定Ｎｉ、Ｃｏ．标样测定结果接近给出的中位值，精密度高．变异系数在２．１％－９．７％之间。     

铬的交流示波极谱滴定

提出了在ＰＨ５的ＨＡｃ－ＮａＡｃ＋ＫＢｒ体系中，加入过量的ＥＤＴＡ溶液与Ｃｒ络合，过剩的ＥＤＴＡ用０．０２ｍｏｌ／Ｌ的ＣｕＳＯ４标准溶液加滴，以Ｃｕ＾２＋在交流示波极谱ｄＥ／ｄｔ－Ｅ曲线上出现切口直接指示滴定测定铬的方法。铬量分析范围为０．８０－１８．００ｍｇ。回收率为９８．８５％－１００．４７％。对于含铬０．ＸＸ％－ＸＸ．ＸＸ％的试样，分析１０次的相对标准偏差为０．２８－１．１２％。     

预变形对含Sc铝锂合金拉伸性能和显微组织的影响

研究了Ａｌ－１．４２Ｌｉ－２．４１Ｃｕ－０．９３Ｍｇ－０．０７３Ｚｒ－０．１７Ｓｃ（ｗｔ％）合金在１６０℃和预变形（１７％）＋１６０℃不同时效时间下的室温拉伸性能。利用透射电（ＴＥＭ）观察了合金的显微组织。结果表明：该合金具有较好的室温室性能，合金主要强化相为δ＇（Ａｌ３Ｌｉ）和δ＇／β复合相。由于合金中同时加入Ｓｃ，Ｚｒ，尤其是添加了０．１７ｗｔ％Ｓｃ导致大量的复合相出现（复合相粒径为２４～３２     

ICP—AES法测定铀矿石尾渣标准物质中9种元素

本文叙述了用９７５型ＩＣＰ直读光谱仪，同时测定铀矿石尾渣标准物质中Ａｓ、Ｂａ、Ｂｅ、Ｃｄ、Ｃｒ、Ｃｕ、Ｎｉ、Ｐｂ和Ｚｎ，以ＨＦ－ＨＮＯ３－ＨＣｌＯ４分解试样，方法的检出限为０．０００５－０．０１４μｇ／ｍＬ相对标准偏差小于１０％，铀矿石尾渣标准物质中９种元素的测得值与标准值一致，方法简便并适用于例分析。     

高铅掺氟Bi系超导体的研制

本文首次报道了五种高铅量Ｂｉ系超导体Ｂｉ２－ｎＰｂｎＳｒ２Ｃａ２Ｃｕ３Ｏｙ－ｘＦｘ（ｎ＝１．０，１．２，１．４，１．６，１．７）的制备，ｘ在１．０－１．４范围内，ｎ依次取上述值时，超导体的Ｔｃｏ分别为１１３．６Ｋ，１１２Ｋ，１０４Ｋ，８８Ｋ，７８Ｋ。Ｘ射线粉末衍射，红外光谱等分析表明，ｎ＝１．０－１．４时超导体仍２２２３相结构特征；ｎ＝１．６，１．７时表现出新的结构特点，此外从化学动力学观点初步探     

一种Cu-Ni-Zr-Be型电阻焊电极合金

本文报道了一种新的无钴、低铍电阻焊电极合金：Ｃｕ－Ｎｉ－Ｚｒ－Ｂｅ（Ｂ合金），将其组织性能同常用的Ｃｕ－Ｃｏ－Ｂｅ（Ａ合金）电极合金作了对比分析。结果表明，Ｂ合金硬度、软化温度同Ａ合金相近，但导电、导热性明显高于Ａ合金。另外，Ｂ合金降低了成本，减少了毒性，延长了电极的使用寿命。最后，探讨了Ｂ合金的成分设计原理。     

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     

ICP－AES法测定四氟化铀标准物质中Cr、Fe、Mo、Ni和Ti

本法采用２５％（ＮＨ４）２ＣＯ３和Ｈ２Ｏ２溶解ＵＦ４，利用２３７－季铵萃淋树脂色谱分离技术，将ＵＦ４中铀与待测杂质元素在６．５ｍｏｌ·Ｌ（－１）ＨＮＯ３介质中定量分离后，及９７５型ＩＣＰ直读光谱仪同时测定ＵＦ４标准物质中Ｃｒ、Ｆｅ、Ｍｏ、Ｎｉ和Ｔｉ。取样３００ｍｇ时，分析结果均落在标准值的置信区间内，相对标准偏差＜１０％。测定下限为０．０４×１０－６～０．０７３×１０－６。     

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