电沉积Ni—W—P—SiC复合材料的组织及结构

Ｘ－射线衍射仪测定表明，当Ｎｉ－Ｗ－Ｐ－ＳｉＣ复合镀层中的磷含量大于８ｗｔ％时，镀层在镀态时呈非晶态结构；α－ＳｉＣ微粒物存在并不影响复合镀层的结构，也不参与结构的转变。热处理温度对Ｎｉ－Ｗ－Ｐ－ＳｉＣ复合镀层的组织结构有一定的影响，当温度升到３００￣４００℃时，产生Ｎｉ３Ｐ粒子，起到沉淀硬化作用，因此，复合镀层的硬度最高；若继续升高温度，Ｎｉ３Ｐ粒子长大，然后集聚并粗化，导致镀层软化，硬度下降。     

Ni—W—P—SiC复合镀层与氮碳共渗复合强化的组织与结构研究

本文讨论工艺条件对Ｎｉ－Ｗ－Ｐ－ＳｉＣ复合镀层表面形貌的影响,分析复合镀层的截面显微组织以及镀层的相结构。结果表明,复合镀层的表面形貌与镀液的ｐＨ值和阴极电流密度有很大关系;复合镀层经氮碳共渗后,增强镀层与基体金属之间的结合力,使其由机械结合转变成冶金结合;Ｘ射线衍射表明复合镀层在镀态下的为非晶态,经氮碳共渗后转变为晶态,并产生很多新相。这些相的存在提高了复合镀层的硬度及耐磨性。     

Sb—Si复合阻燃剂的性能及其对PVC拉伸强度的影响

研究了Ｓｂ－Ｓｉ超细复合阻燃剂的热稳定性、阻燃性及其对软质ＰＶＣ力学性能的影响。结果表明，与超细Ｓｂ２Ｏ３相比，Ｓｂ－Ｓｉ有助于提高软质ＰＶＣ的热稳定性及拉伸强度，氧指数达难燃标准（添加５份）。     

搅拌速度对LA141镁锂合金纳米复合镀层的影响

为进一步扩大超轻LA141镁锂合金的应用范围，提高其表面硬度、耐蚀性和耐磨性，采用化学复合镀的方式在LA141镁锂合金表面制备Ni-P/nano-Al2O3复合镀层，主要研究了搅拌速度对复合镀层物相结构、微观形貌、硬度、耐蚀性和耐磨性的影响。结果表明：随着搅拌速度的增加，复合镀层表面的纳米粒子沉积量先增加后减少，其硬度、耐蚀性和耐磨性同样呈现出先增加后减小的趋势。当镀液搅拌速度为600 r/min时，复合镀层的耐蚀性最好，其腐蚀电位和腐蚀电流密度分别为-0.502 V和3.85×10-5 A/cm2；当镀液搅拌速度为800 r/min时，复合镀层的纳米粒子沉积量最多，耐磨性最好，其摩擦系数在0.45～0.55之间，磨痕宽度约为750 μm。     

Ni-P/纳米Al2O3复合镀层的制备及其耐磨性能

在化学镀Ni-P合金溶液中加入纳米Al2O3微粒,通过化学沉积法制备Ni-P/纳米Al2O3复合镀层.用扫描电子显微镜(SEM)观察复合镀层的表面形貌,用显微硬度计和平磨机测试Al2O3复合量、热处理等工艺条件对Ni-P/纳米Al2O3复合镀层硬度及耐磨性能的影响.结果表瞬,复合纳米Al2O3粒子后,Ni-P合金镀层的硬度和耐磨性显著提高,而且随着Al2O3复合量的增大镀层硬度和耐磨性不断增加.当纳米Al2O3复合量为10.1%时,Ni-P/纳米Al2O3复合镀层的硬度较Ni-P增大28%,磨损质量损失减少20%以上.400℃热处理后.复合镀层的硬度由570HV增加到1180HV.     

15CrMn2SiMo钢的机械性能研究

在不同热处理工艺条件下,研究了１５ＣｒＭｎ２ＳｉＭｏ 钢的机械性能变化状况,并与１８Ｃｒ２Ｎｉ４ＷＡ、２０Ｃｒ２Ｎｉ４ 等钢作了比较,结果表明１５ＣｒＭｎ２ＳｉＭｏ 可以用作煤矿机械重载齿轮材料。     

Sb—A复合阻燃剂在软PVC中的热稳定性,阻燃抑烟性及力学性能

本文研究了Ｓｂ－Ａ复合阻燃剂在软ＰＶＣ中的稳定性，阻燃抑烟性及力学性能，结果表明，使用Ｓｂ－Ａ复合阻燃剂后，软ＰＶＣ的氧指数可达３０．８，同时发烟量只相当于使用超细Ｓｂ２Ｏ３时的７７％。Ｓｂ－Ａ复合阻燃剂与超细Ｓｂ２Ｏ３相比，有助于提高ＰＶＣ的热稳定性及抗张强度。     

PdCuSi非晶合金晶化过程的相变及电子结构的研究

报道了用ＤＴＡ和Ｘ射线衍射综合技术研究Ｐｄ－Ｃｕ－Ｓｉ非晶合金体系晶体全过程中的相变观测结果。实验表明，在结晶过程中亚稳态稳定态转变与前人报道的有明显不同。用ＸＰＳ技术观测了Ｐｄ－Ｃｕ－Ｓｉ非晶合金体的诸原子的电子结构变化，表明Ｃｕ，Ｓｉ原子对该体系的晶化相变过程有重要影响。     

锰含量对W－Ni－Cu合金性能的影响

本文探讨了锰的添加量以及其工艺因素对Ｗ－Ｎｉ－Ｃｕ钨基合金性能的影响，同时指出了制备具有较好综合性能的Ｗ－Ｎｉ－Ｃｕ合金的有效途径。     

ICP－AES法测定八氧化三铀系列标准物质中11种杂质元素

本法采用ＴＢＰ萃取树脂，利用革取色谱分离技术，使铀与待测杂质元素在３ｍｏｌ／ＬＨＮＯ３介质中得到定量分离。用９７５型ＩＣＰ直读光谱仪同时测定八氧化三铀系列标准物质中Ｃａ、Ｃｄ、Ｃｒ、Ｃｕ、Ｆｅ、Ｍｇ、Ｍｎ、Ｍｏ、Ｎｉ、Ｐｈ和Ｓｎ１１种杂质。测定下限为０．０２—１．６μｇ·ｇ－１，相对标准偏差＜１０％。分析结果均落在标准值的置信区间内     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

Brief news

正China Minmetals Rare Earth Construction of Jianghua Separation Plant is set to complete at the yearend Civil works of Jianghua Separation Plant have been finished and the company is installing and debugging equipments now.It is estimated that construction of Jianghua Separation Plant will be     

Brief news

正Total transactions of rare earth in Rare Earth Ex-change Center of Hunan South Rare and Precious Metal Exchange neared 40 billion yuan from January to October From the opening in January of this year to the end of October,the total transaction of rare earth products in Rare Earth Exchange Center of Hunan South Rare and Precious Metal Exchange neared40 billion yuan.There are 16 varieties including dysprosium oxide and terbium oxide traded on the exchange center,one of the largest trading platforms for rare earth oxides in China.     

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     

Theoretical basis for optimal collector concentrations and pulp pH values during flotation of sulfide-free minerals

A hypothesis that associates optimal conditions of mineral flotation with a zero charge of their surface is put forward. This hypothesis serves as a basis for a methodology to obtain and verify quantitative physical-chemical models for a minimal necessary concentration of a collector during flotation of sulfide-free minerals. These models may be of use for upgrading engineering processes of flotation and as a job for the concentration plant automation systems. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 89–99, March–April, 2006.