喷射沉积Cu－Pb合金的研究

研究了由Ｏｓｐｒｅｙ工艺制取的喷射沉积Ｃｕ－２４Ｐｂ－１Ｓｎ合金板坯的显微结构、弯曲断口的表面形态和冷轧变形对合金密度的影响。结果表明：喷射沉积合金的铅相细小且均匀分布，消除了宏观偏析。冷轧后，板坯的相对密度可由沉积态的９６％提高到１００％。本文还讨论了合金的重力偏析和喷射沉积过程的液－团相比率控制问题。     

铁钨合金电沉积浅议

概述了国内外铁钨合金电沉积的研究现状及其应用前景 ,阐明了铁钨合金电沉积的理论依据 ,试验了在不同金属基体上电沉积铁钨合金。     

喷射沉积Cu—Pb合金的研究

研究了由Ｏｓｐｒｅｙ工艺制取的喷射沉积Ｃｕ－２４Ｐｂ－１Ｓｎ合金板坯的显微结构、弯曲断口的表面形态和冷轧变形对合金密度的影响。结果表明：喷射沉积合金的铅相细小且均匀分布，消除和宏观偏析。冷轧后，板坯的相对密度可由沉积态的９６％提高到１００％。本文还讨论了合金的重力偏析和喷射沉积过程的液－固相比率控制问题。     

沉积电流对Ni-Mo-Co合金析氢催化性能的影响

采用电沉积方法在Cu基体上制备出Ni-Mo-Co三元合金电极,主要研究了沉积电流对Ni-Mo-Co合金电极析氢催化活性的影响。采用扫描电子显微镜和X射线衍射技术分别研究了Ni-Mo-Co合金镀层的表面形貌、元素组成和晶体结构,采用稳态极化曲线和交流阻抗技术研究了Ni-Mo-Co合金电极在30%KOH溶液中的析氢催化性能。结果表明:电沉积Ni-Mo-Co合金外观呈银白色,表面光滑细致,为非晶态结构。合金电极的析氢催化性能随着沉积电流的增大表现为先升高后降低的趋势,当沉积电流密度为15 mA.cm-2时,获得合金镀层具有最低的析氢过电位η100=139 mV,显示出良好的析氢催化活性。其析氢反应为Volmer-Heyvosky反应机制,主要受电化学脱附步骤控制。     

超声电沉积制备Cu-In合金膜

采用超声电沉积-热处理两步法和超声共沉积一步法在钼基底上制备了致密的Cu-In合金薄膜。分别用SEM,EDS和XRD分析了Cu/In双层膜以及Cu-In合金膜的表面形貌、成分及相组成。结果表明:采用不同的电沉积工艺参数可以调节合金膜的Cu/In比率;超声电沉积可以得到晶粒细小、均匀致密的Cu,In以及Cu-In合金薄膜;两步法中超声电沉积得到的双层膜为CuIn和Cu或In相,经过热处理后转变为Cu11In9和Cu或In相;一步法超声共沉积得到的合金膜主要为CuIn相,根据Cu/In比率的不同,还会含有少量的Cu11In9或In相。     

电沉积镍钨合金的应用及研究现状

综述了电沉积镍钨合金的研究现状,分析了镀液成分和工艺条件对电沉积镍钨合金镀层的组成及其性能的影响,并介绍了镍钨合金镀层的各种性能,最后指出了今后的发展趋势和研究意义所在。     

Sn-Ni-Mn合金的电沉积行为及成核机制

研究了Sn-Ni-Mn合金在玻碳电极上的电沉积行为及成核机制。采用阴极极化、循环伏安、电化学阻抗及恒电位阶跃等电化学方法研究镀液成分、温度、pH对Sn-Ni-Mn合金电沉积阴极极化行为的影响,以及不同扫描速率和阴极电位下Sn-Ni-Mn合金电沉积机制。试验结果表明:降低主盐浓度、提高络合剂(Na_3C_6H_5O_7·2H_2O)和添加剂(糖精钠)浓度、降低镀液温度、提高镀液pH均会使阴极极化曲线负移,极化作用增强,有利于电极电位较负的Mn~(2+)还原沉积;Sn-Ni-Mn合金电沉积过程主要受扩散控制,非可逆;随阴极过电位升高,Sn-Ni-Mn合金电沉积电荷转移电阻减小,沉积速率加快;Sn-Ni-Mn合金电结晶过程遵循扩散控制下的三维瞬时成核机制。     

挤压工艺参数对喷射沉积AlFeVSi合金棒材组织性能的影响

采用雾化粉末-冷等静压工艺和喷射沉积工艺制备快凝AlFeVSi合金坯料,通过透射电镜、扫描电镜、拉伸力学性能测试等手段研究挤压温度、挤压变形系数以及加热时间等工艺参数对喷射沉积AlFeVSi合金组织性能的影响。选择合适的工艺参数,挤压制备了喷射沉积AlFeVSi合金棒材,并以快凝雾化粉末AlFeVSi合金挤压棒材为参考对象,对比分析了喷射沉积AlFeVSi合金棒材室温、高温拉伸力学性能。结果表明,挤压温度不宜高于500℃,否则棒材强度和塑性则会因有粗大块状θ-Al13Fe4相出现而急剧下降。喷射沉积AlFeVSi合金挤压棒材的抗拉强度和伸长率均随挤压变形系数增大而单调提高,当挤压比λ大于16后,抗拉强度和伸长率趋于稳定。选择合适的工艺参数(挤压温度480℃,加热时间3h,挤压比25),可以制备室温、高温力学性能良好的喷射沉积AlFeVSi合金挤压棒材。     

水溶液中电沉积非晶态稀土合金的研究进展

稀土元素的还原电位很负，在水溶液中很难沉积。如何使其正移是实现稀土合金电镀的关键。分析了络合剂对稀土合金电沉积的影响，恰当的络合剂不但起到稳定镀液的作用，而且能使稀土的沉积电位显著正移。研究了非晶态合金电沉积的特点，利用二维Miedem坐标(△Φ^*和△nws^-1／3)以及加入尺寸因素(△R／RA)构成的三维化学坐标分析了水溶液电沉积非晶态稀土合金的形成规律。     

喷射沉积Zn-38Al-2Cu合金微观形貌和摩擦磨损性能研究

通过SEM和TEM观察发现:喷射沉积制备的Zn-38Al-2Cu合金沉积坯具有细小均匀的微观组织结构,无严重偏析,结合XRD分析可知,合金组成主要为类片状珠光体的α+η片层状共析组织以及少量弥散分布的纳米级富铜ε相沉淀颗粒.通过挤压和热处理工艺,可以完全消除沉积过程中形成的大量孔洞,显著改善合金的力学性能.摩擦实验发现,Zn-38Al-2Cu合金的摩擦系数随着摩擦荷载的增加而减小,随着摩擦速度的增大而增大.当荷载较低时,主要呈现犁削磨损;而荷载较大时,碾压磨损和粘着磨损占主导地位.与普通铸造态合金相比,喷射沉积+挤压+热处理大大提高了合金的耐磨性能.     

Chinalco Signed Framework Agreement for Strategic Cooperation with Harbin Municipal Government

正Last month,Chinalco signed framework agreement for strategic cooperation with Harbin Municipal Government in Harbin Xiong Weiping,Chairman of Chinalco,said that based on the strategic deployment to build world top-class mining company with the highest growth potential,Chinalco was now concentrating all efforts on making strategic transition and structural adjustment,strategic cooperation with the local governments where     

Jiangxi Promotes Jiangxi Copper Corporation To Become The World's Most Competitive Mining Company

<正>According to the latest info from Jiangxi Province State-owned Assets Supervision and Administration Commission,Jiangxi Copper Corporation was approved to become the first pilot enterprise for deepening reform.Contents of the pilot work is"Three Self"(self expansion,self decision-making,self     

Journal of Rare Earths Contents List of Vol.32(2014)

正~~     

Contributions to Baosteel Technical Research wanted

正Baosteel Technical Research,a quarterly journal,which is issued domestically and abroad,is run and sponsored by Baosteel Group Corporation.Baosteel Technical Research mainly reports the achievements in technological innovation,academic research,new product development and industrial equipment improvement by Baosteel.It will continue to follow up on hot topics and serve the company’s technological development and progress.Its readers include experts in     

Ministry of Industry and Information Technology: No Short Term Solution For Our Country’s Excess Nonferrous Metal Smelting Capacity

【正】According to the Ministry of Industry and Information Technology,the Ministry has released the 2013 Operation Report on China’s Industrial Communication Indu...     

Chinalco Signed Framework Agreement for Strategic Cooperation with Gansu Province

正Recently,Chinalco and Gansu Provincial People’s Government signed"Framework Agreement for Strategic Cooperation on Reform,Restructuring and Transition Development of Chinalco’s Electrolytic Aluminum Enterprises in Gansu",signifying that the strategic cooperation between Chinalco and Gansu Province had made new substantive progress.     

Unavoidable Economic Cycle:30% Of Nonferrous Metal Companies Were Involved In Restructuring

正Owing to continual downturn in real estate and bulk commodity markets,a number of traditional industries in China suffered unfavorable impact in performance.With the progressive disclosure of third quarter report,the no-pleasant-surprise performance of     

Baotou Rare Earth Became the World's Biggest High Performance Magnetic Material Base

正The High Performance Magnetic Material Phase II Project,an industry upgrading project implemented by Inner Mongolia Baotou IronSteel Rare Earth(Group)Hi-tech Co.,Ltd,recently basically finished equipment commissioning,signifying that the enterprise had developed the production capacity of15000 t/a Nd-Fe-B strip casting alloy and 5000t/a Nd-Fe-B magnet,thus becoming the world’s     

Introducing Two Central Enterprises to Integrate Rare Earth Industry,Shandong Rare Earth Group Breaks Surface

正With the signing of"Letter of intention for Propelling Integration of Shandong Rare Earth Enterprises"between Shandong Province Commission Of Economy and Informatization,China IronSteel Research Institute Group("China Steel Institute"),and China Rare MetalsRare Earth Co.,Ltd("China Rare Earth"),the"Shandong Rare Earth Group"jointly set up by the 3 units thus broke surface.On August 9,reporters of the China Economic Herald learned from Shandong Province     

Aluminium Production by Province or City in 2014

正~~