替代方式对稀土系储氢合金电化学性能的影响

本文采用Co、Mn、Cu同时替代La Mg2Ni9中的Ni,并且与Cu单独替代时合金的电化学性能进行了比较,实验结果表明,与单元替代相比,多元替代有着较高的放电容量和较好的活化性能,但是其循环稳定性较差,文章系统的分析了产生此种现象的原因。此外,通过对综合性能最佳的合金La Mg2Ni2.7Co2.1Mn2.7Cu1.5进行X衍射分析,从微观角度进一步研究了储氢合金成分对合金电化学性能的影响,认为La4Co3和Mg Co Cu0.9Ni0.1可能是提高合金的最大放电容量的原因。     

放电等离子烧结Fe50Mn30Co10Cr10高熵合金的显微组织演化

以金属元素粉末为原料,采用机械合金化(MA)+放电等离子烧结(SPS)法制备Fe50Mn30Co10Cr10高熵合金,研究了烧结温度、烧结压力对Fe50Mn30Co10Cr10高熵合金显微组织和力学性能的影响.结果表明,不同温度下烧结获得的Fe50Mn30Co10Cr10高熵合金均为包含fcc基体相和层片状hcp相的双...     

扩散方程解和烧结材料中合金元素的分布

讨论了扩散微分方程在几种条件下的积分解, 采用辛普生法计算误差函数erf（z）的定积分值, 就2个不同浓度无限源的扩散状况, 进行了数值计算. 描述了计算扩散分布的FORTRAN程序框图, 给出了C、Co、Cr、Mn、Mo、Ni及V等合金元素在Fe中扩散分布的计算结果, 在通常烧结温度1 120～1 150 ℃下, Mo和Ni等元素的扩散距离仅1～3μm. 因此, 若加入合金元素粉末, 其粉末粒度应控制于此值, 以保证扩散的均匀性, 同时还讨论了合金分布均匀性对机械性能的影响.     

V,Mn和Co对AB2型贮氢电极合金Zr-Cr-Ni相结构和电化学性质的影响

研究了元素Mn ,V和Co部分替代ZrCr0 .7Ni1 .3合金中的Cr和Ni后对其相组成、晶格常数和电化学性质等方面的影响。结果表明 :母体合金由主相立方C15型Laves相和少量六方C14型Laves相和第二相Zr7Ni1 0 组成。在ZrCr0 .7-xVxNi1 .3(x =0 .1～ 0 .6)合金中 ,随着V含量的增加 ,合金主相中C15型Laves相含量逐渐减少 ,而C14型Laves相含量逐渐增多 ,而第二相Zr7Ni1 0 逐渐向Zr9Ni1 1 相转化 ,同时合金的电化学容量也迅速降低 ;当元素Mn和V同时进行替代时 ,合金ZrCr0 .7-x -yMnxVyNi1 .3(x y =0 .2～ 0 .4)的相组成不大 ,其中合金ZrCr0 .4 Mn0 .1 V0 .2 Ni1 .3放电容量最高 ( 3 11mAh·g- 1 )。元素Co对合金ZrCr0 .4 Mn0 .1 V0 .2 Ni1 .3中的Ni进行替代时 ,合金的主相中C14型Laves相显著增多 ,其中合金Zr Cr0 .4 Mn0 .1 V0 .2 Co0 .1 Ni1 .2 的电化学容量最高为 3 3 6mAh·g- 1 ,具有良好的循环稳定性和自放电率     

新型低膨胀Mo-Cu合金电子封接材料研究

本试验研究了添加活化元素Ni对Mo-Cu合金的相对密度、烧结性能、热导率、电导率、热膨胀系数及组织的影响.研究结果表明:在Mo-Cu合金中加入Ni能降低合金烧结的致密化温度,促进烧结的进行.但Ni的加入降低了合金的导电和导热性能,并且使合金的组织变得粗大,75Mo-20Cu-5Ni的导热系数和95%Al2O3,陶瓷非常匹配,可被用作与其封接的合金.     

碳酸盐共沉淀法合成LiNi1/3Co1/3Mn1/3O2及其电化学性能

以碳酸盐共沉淀法合成了Ni1/3Co1/3Mn1/3CO3前驱体,然后以Ni1/3Co1/3Mn1/3CO3和LiOH·H2O为原料,合成出了层状锂离子电池正极材料Li Ni1/3Co1/3Mn1/3O2.通过XRD,SEM和电化学测试对Li Ni1/3Co1/3Mn1/3O2材料的结构、形貌及电化学性能进行了测试和表征.结果表明,800℃烧结12 h所合成的样品粒度大小分布比较均匀,以0.2 C充放电,其首次放电容量为153 mAh·g-1,循环30次后容量为140 mAh·g-1.     

注射成形和模压成形Cu-10Ni合金的烧结行为

分别采用模压成形和注射成形技术制备Cu-10Ni合金,研究该合金不同成形方式下的烧结行为.结果表明:合金的致密化过程和力学性能均受烧结温度的显著影响,烧结过程均包括合金化、均匀化和致密化3个阶段.模压成形坯在1000℃、注射成形坯在1050℃烧结后,致密化程度均较高、显微组织较好、力学性能较佳.其中,注射成形制备的Cu-Ni合金表现出致密化过程较长、滞后于模压成形合金的烧结行为,完成烧结所需的温度较高.     

钨基高密度合金粉末的温压成形行为研究

研究了 93W 5Ni 2Cu和 93W 4 9Ni 2 1Fe在不同温度下的温压成形行为。结果表明 :与常温成形相比 ,温压能够明显地提高压坯密度 ,在 1 5 0℃时 93W 4.9Ni 2 .1Fe和 93W 5Ni 2Cu压坯的密度分别提高 0 2 6g/cm3 和 0 97g/cm3 ;温压成形能显著的降低压坯的弹性后效 ;W Ni Cu粉末温压压坯在脱模过程中 ,脱模力发生波动 ,在压坯运动瞬间达到最大后迅速降低 ;W Ni Cu粉末在相同载荷作用、温压条件下的位移大于常温下 ;压坯经烧结后 ,温压坯件的径向收缩小于常温坯件 ;温压可以改善钨基高密度合金的显微组织     

Fe-Ni-Mo-Cu-Co-Cr-Mn水雾化合金钢粉的研制

本文介绍了一种用于生产汽车排气阀座的Fe Ni Mo Cu Co Cr Mn水雾化合金钢粉的研制过程 ,分析了有关工艺控制对该种含Cr、Mn易氧化元素粉末氧含量和颗粒形状、粒度组成、松装密度、压缩性、流动性等性能指标的影响 ,确定了为获得低碳、低氧含量、高松装密度、高压缩性和高成形性的Fe Ni Mo Cu Co Cr Mn水雾化合金钢粉应采取的有关措施 ,为批量生产质优价廉的排气阀座用水雾化合金钢粉找出了一条有效的途径。     

机械合金化MlNi_(3.55)Co_(0.75)Mn_(0.4)Al_(0.3)/Mg复合储氢合金的相结构和电化学性能

采用机械合金化法制备了MlNi3.55Co0.75Mn0.4Al0.3+x%Mg(Ml=富镧混合稀土;x=3,5,7,10)复合储氢合金。利用X射线衍射和电化学测试方法对MlNi3.55Co0.75Mn0.4Al0.3铸态合金和MlNi3.55Co0.75Mn0.4Al0.3/Mg复合合金的相结构和电化学性能进行了研究。X射线衍射结果发现,MlNi3.55Co0.75Mn0.4Al0.3合金由单一的La Ni5相组成。而MlNi3.55Co0.75Mn0.4Al0.3/Mg复合合金由La Ni5主相和小量的(La,Mg)2Ni3相组成,且合金中(La,Mg)2Ni3相的含量随镁含量x的增大而增多。此外,当复合合金中镁含量较多(x=10)时,复合合金有非晶化的趋势。电化学性能测试结果发现,当添加镁含量较少(x≤7)时,合金的最大放电容量、放电性能以及循环稳定性都好于MlNi3.55Co0.75Mn0.4Al0.3合金的相应性能,其中x=5时,合金的综合电化学性能最佳。合金电化学性能的改善得益于合金中形成恰当比例的La Ni5和(La,Mg)2Ni3相。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.