Co-B_4C复合镀层耐磨性能研究

采用复合电沉积技术在45钢基体上制备了Co-B4C复合镀层,对复合镀层的截面形貌和组织结构进行了观察分析,研究了镀液中B4C颗粒含量对复合镀层的显微硬度和摩擦磨损性能的影响。研究结果表明,B4C颗粒均匀地分布于Co基金属中,镀层与基体结合良好,无孔隙和裂纹等缺陷,镀态下镀层为晶态结构;随着镀液中B4C颗粒含量的增加,镀层的显微硬度和耐磨性也逐渐提高,且当镀液中B4C颗粒含量分别为20 g/L、15 g/L时,镀层的显微硬度和耐磨性达到最高值。     

SiC含量对液压机立柱表面Ni-SiC复合镀层性能影响

为了改善煤矿液压机立柱的耐磨及耐蚀性能,采用复合电镀在45钢表面获得了表面光洁平正、结合紧密的Ni-SiC复合镀层,并测试了涂层的硬度、耐磨性能及在模拟矿井溶液中的耐蚀性能。结果表明:复合镀层的硬度与耐磨性能随着镀液中SiC颗粒的含量上升而上升,在镀液中碳化硅颗粒含量30g/L时,镀层的显微硬度、耐磨性能最高;SiC颗粒的加入降低了镀层的耐蚀性能,且SiC颗粒含量越高镀层的耐蚀性能越差。     

电沉积Ni-W合金纳米晶的组织与性能

通过电沉积方法镧备Ni-W合金纳米晶，研究钨酸钠浓度、电流密度、镀液pH、温度等四个工艺参薮对Ni-W合金沉积速率、星徽硬度、镀层表面质量的影响。结果表明，通过控镧钨酸钠浓度，可获得不同尺度的Ni-W合金纳米晶，随电流密度增加，镀层的沉积速率和星徽硬度提高。镀液的pH对镀层性能影响最大。Ni-W合金纳米晶镀层具有较高的抗腐蚀性。     

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微粒的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。扫描电镜证明，α—ＳｉＣ微粒在复合镀层中的分布较均匀。添加剂的加入，有利于提高复合镀层的晶化温度。     

B_4C含量对Ni-Co/B_4C复合镀层硬度及耐磨性的影响

采用复合电沉积的方法制备出Ni-Co/B4C复合镀层。利用光学显微镜、XRD衍射等方法分析了复合镀层的微观形貌及相结构。结果表明,所制备的Ni-Co/B4C复合镀层均匀致密,基体界面结合良好,B4C颗粒分布均匀,镀态下镀层为晶态结构。研究了镀液中B4C颗粒含量对复合镀层硬度及耐磨性的影响,随着镀液中B4C颗粒含量的增加,Ni-Co/B4C复合镀层的显微硬度和耐磨性能均明显提高。     

络合剂含量对脉冲电镀Ni-Cr合金性能影响的研究

为了分析络合剂含量对Ni-Cr镀层性能的影响,采用脉冲电镀技术制备了高镍微铬的Ni-Cr合金镀层。并采用带有能谱分析仪的扫描电镜,观察分析了镀层的微观结构及成分;分别测试了镀层的显微硬度、耐磨性能及镀层的耐蚀性能,从而得出试验范围内镀液中络合剂柠檬酸钠的最佳浓度为0.4mol/L。     

YG6硬质合金化学镀Ni-P研究

为改善YG6硬质合金与合金钢之间的钎焊性能,在YG6合金表面制备了化学镀Ni-P镀层,主要研究了pH值、温度及添加剂含量对镀速、镀层结构以及钎料润湿性的影响。结果表明,随着镀液pH值升高,化学镀镀速先增加后降低,镀层对焊锡润湿性先增加后降低;随着镀液温度升高,化学镀镀速和镀层对焊锡润湿性逐渐增加;随着添加剂含量升高,化学镀镀速增加,镀层的表面粗糙度和对焊锡润湿性先都出现先增加后降低的趋势。最佳的镀覆工艺参数为:p H=9、温度80℃、添加剂含量1.5 g/L,获得的镀层组织均匀致密,与焊料润湿性好。     

电刷镀Ni/石墨复合镀层的工艺及性能研究

针对一些零件应用于无润滑条件下的现状。研究制定了Ni/石墨复合电刷镀的技术工艺流程和镀液配方。运用电刷镀工艺技术在45钢基体上刷镀Ni/石墨颗粒复合镀层,并对影响镀层性能的镀液中石墨颗粒含量、刷镀电压、刷镀的相对速度等因素进行了研究。从而得出最佳的工艺参数:镀液中石墨粉末含量80 g/L,刷镀电压9 V,颗粒平均粒径d<20μm,镀液温度20℃。在最优工艺参数下制备的Ni/石墨颗粒复合镀层显微硬度为HV713.1,磨损体积快速镍镀层是Ni/石墨颗粒复合镀层的2.248倍,对于提高零件的耐磨性及可靠性有很重要的意义。     

纳米铝/铜复合镀层的工艺及性能研究

介绍了运用电刷镀工艺技术在45钢基体上刷镀铝/铜复合镀层,并对影响镀层性能的镀液中纳米铝粉的含量、刷镀电压进行了研究。根据实验,得出最佳的工艺参数:镀液中纳米铝粉末含量20 g/L,刷镀电压10 V。在最优工艺参数下制备的纳米铝/铜复合镀层显微硬度为HV243.7,磨损体积普通铜镀层是铝/铜复合镀层的1.76倍,对于提高工件的耐磨性及可靠性有很重要的意义。     

非水溶液电镀铝的结构研究

本文利用 X 射线衍射及电镜等手段研究了在三氯化铝、氢化铝锂及四氢呋喃加甲苯的有机体系中,具有不同极化特性的镀液对镀层组织结构及延展性的影响.结果表明,镀液的极化特性、杂质含量及其存在形式是决定镀层延性好坏的重要因素.由阴极极化较大的镀液获得的镀层,其杂质锌、铜、碳等的含量较高,并以第二相的形式析出,致使镀层呈脆性,晶格常数减小;反之,由阴极极化较小的镀液获得的镀层,则由于少量杂质固溶于基体中,镀层延性好,晶格常数因以碳为主的杂质间隙固溶造成的膨胀畸变而增大.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

Brief news

正Corun invested another 50 million yuan in power battery for HEV Hunan Corun announced on 27 June that they had signed the cooperation agreement to jointly built Corun(Shaoxing)Autos Power Battery System Co.,Ltd.in Shaoxing Binhai New City.According to the announcement,total registered     

铜熔炼中锍品位对杂质元素分配行为的影响

借助于多相、多成分系统中平衡计算的手段，开发出微量元素砷、锑、铋及伴生元素铅、锌等在铜熔炼中分配行为的计算机模型。利用该模型对铜熔炼过程进行计算机模拟，分析了冰铜品位对砷、锑、铋、铅和锌等杂质元素的分压、活度系数及它们在冰铜、炉渣和气相中分配率的影响，并讨论其热力学分析结果对生产实践的指导意义。     

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,