高松装密度金属钽粉的制备

将钠还原原生一次粒子采用搅拌预团化、高温热处理凝聚团化、氢化制粉以及镁还原脱氢脱氧等工艺处理,制备出松装密度大于3.0g/cm3的金属钽粉。该方法制备金属钽粉的成本大幅下降,产品可广泛应用于合金添加剂和钽材加工。     

钠还原中压钽粉工艺因素控制

本文通过钠还原制取中压钽粉实验,讨论了还原起始温度、注钠速率、一次注钠温度等工艺因素对中压钽粉物理性能和电性能的影响。其结果可供生产中压钽粉时参考。     

钠还原生产钽粉工艺的改进

通常用液体钠还原K_2TaF_7来生产钽粉。对于电容器使用的钽粉,是将粉末压形后烧结,并进行阳极化处理以生成一绝缘层。表面积大小是钽粉的一个重要特征。 可用控制钠还原开始时的成核数目或降低工艺温度来减少钽粉的粒径。温度对钽粉的粒径有很大     

烧结钽电容器

本文报道了德国柏林格拉斯赫尔曼·斯达克公司,钽研究实验室制备钽,并论述了用钽粉生产烧结电容器。特殊级钽粉用以生产烧结钽阳极,这种电容器级钽粉分为两类:1、钠还原粉2、融熔粉钠还原粉是用钠还原氟钽酸钾 K_2T_aF_7制备的。融熔粉是用钽块     

低氧冶金级钽粉的生产工艺及产品性能

对低氧冶金级钽粉的生产工艺及产品性能进行了分析。通过钠还原氟钽酸钾的生产工艺得到的钽粉(FTa-1)是由许多原生粒子(又称一次粒子)结合组成、高比表面积空间网状结构的多孔团聚体,松装密度最小,比表面积最大,相应的氧含量也最高。经过氢化制粉得到的钽粉(FTa-2、FTa-3),经过高温烧结实现了致密化,颗粒形貌单一,是高纯的实心颗粒粉末,其松装密度大,比表面积较小,相应的氧含量也低。FTa-2、FTa-3钽粉比较适合于医用多孔钽的及3D打印的应用。     

氟钽酸钾钠还原生产钽粉的工艺现状及展望

简略地综述了国内外氟钽酸钾钠还原生产钽粉的工艺现状，并对其发展趋势提出了一些看法。     

高松装密度金属钽粉的生产制备工艺探讨

高松装密度金属钽粉的生产制备是一个比较复杂的过程,所以它需要经过一系列的工艺处理才能够顺利完成。其制备的实质就是进行钠还原,再经过一系列比较复杂的制备工艺来制造金属钽粉。采用这种方法来制备金属钽粉可以有效提高钽粉的松装密度,值得推广使用。     

金属陶瓷过滤—混合装料钠还原法制取金属钽粉

一、前言 钽粉是电子工业、自动控制的重要军工材料,钽的主要用途是作电容器。钽电解电容器具有比电容量大、体积小、可靠性高等优点,广泛地应用于重要的电子线路中。由于国防电子工业和尖端技术的需要,钽冶炼工艺趋向于发展高质量、高比容的钽粉生产。 过去,钽粉生产一直采用分盘式钠还原工艺,其反应为汽液反应,反应缓慢,所得钽粉粒度粗,比容小、炉产量低、还原周期     

大罐生产低氧钽粉的还原注钠工艺的改进

对D700mm大反应罐生产低氧钽粉的还原注钠工艺进行了研究与改进。结果表明：改建后的工艺基本上解决了工艺参数的控制问题和操作问题，还原钽粉的氧含量可稳定控制在1％左右。     

氟钽酸钾钠还原制备工艺对钽粉性能的影响

为制备出大比表面积的高性能钽粉,根据钠还原氟钽酸钾制备钽粉的过程分析,对其主要影响因素(还原温度、稀释剂比例、还原速度、搅拌转速)对钽粉性能的影响进行了研究。结果表明,随着还原温度降低,还原的钽粉比表面积增大;还原温度提高会增加还原过程中反应容器的腐蚀,造成金属杂质增加。稀释剂比例增加,有利于生成大比表面积钽粉,但会降低钽粉收率,且杂质含量增加。注钠速度、搅拌转速不是主要影响钽粉比表面积的关键因素。     

熔炼次数对M17返回料合金成分、组织和性能的影响

实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。     

Shijiazhuang will Build the World's Biggest Replacingcopper-with-aluminum Cable Production Base

正Shijiazhuang City will build the world’s biggest replacing-copper-with-aluminum cable production base,the annual output value can reach 100 billion yuan,in the future it will develop replacing-copper-with-aluminum highend industry cluster.This piece of news was learned by the reporter at the Rare Earth highiron Aluminum Alloy[Nonferrous Business Opportunity:Aluminum alloy door]Cable Conductor New Technology Application Seminar held at the provincial capital.     

Chongqing is Preparing to Set Up Nonferrous Metal Exchange,in a Bid to Become the Transit Place of Kazakhstan Copper

正Since the beginning of Chongqing’s upgrading to a municipality directly under the Central Government,Chongqing City has established direct friendly relationship with Almaty,Kazakhstan,and carried out a series of cooperation in commerce and trade,and culture     

Guangxi Baise Extends Industrial Chain to Combat Loss in Aluminum Business

正"For each tonne of aluminum being produced,the upstream enterprise on the aluminum industrial chain will suffer loss about 2000yuan."Said Liang Xiao,Deputy Director of Pingguo Industrial Park Management Committee under the Guangxi Baise City,one of the four major aluminum industry bases in China,on August 11.Extending aluminum     

JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL ANNUAL CONTENTS Volume 21(2014)

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Chinalco Straightened Out Copper Assets,and Delegated Stock Equity of Yunnan Copper

正Immediately after the news that Chinalco transferred 58%stock equity of Yunnan Copper Group to its wholly-owned subsidiary China Copper Corporation Limited free of charge was disclosed on July 9,many individual investors couldn’t help but to think:Does it mean China Copper Corporation Limited will assemble assets for overall listing?At present,among main copper business companies under China Copper Corporation     

The Development and Reform Commission Encourages Private Capital to Enter Geological Prospecting Field

正At the press conference recently held by the National Development and Reform Commission under the theme"Deepen Reform in Investment AuditApproval System",when answering questions from reporters,Huang Min,Director of the Department of Fixed Assets Investment of the National Development and Reform Commission,said that in the future it would continue to intensify efforts in geological prospecting,and actively guide social capital to enter this field.     

Guangxi's first Nickel Industry Development Research Report Was Released

正Recently,Guangxi Metallurgical Research Institute,a subsidiary of Guangxi Nonferrous Metals Group,completed survey on laterite and related manufacturers in the region,by combining the current development status of laterite both at home and abroad,it compiled Guangxi’s first"Research Report on the Development of Guangxi Nickel Industrial Chain"which adopted laterite as the study subject.This report expounded on the current     

China’s Major Non-ferrous Metals Imports & Exports(End of September. 2014)

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China's Major Non-ferrous Metals Imports & Exports

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