固液反应球磨制备W-Al金属间化合物

通过W棒对液态金属Al在不同温度及时间内球磨, 制备了W-Al金属间化合物。采用X射线和扫描电镜及透射电镜等分析手段分析产物特征。结果表明,在球料比为14∶1 ,转速为80 r/min 的条件下,用W棒对液态Al进行不同时间及温度的液态球磨后,得到了不同的金属间化合物粉末。在953 K时得到金属间化合物粉末为Al₁₂W和Al₅W,1 023 K时产物为Al₅W, 1 163 K时产物为Al₄W。采用固液反应球磨技术在高温下可以形成粒度为50 nm,甚至达到纳米级的金属间化合物粉末。     

水溶液球磨制备氧化亚铜粉末的研究

以铜粉、氧化铜粉末为原料, 采用球磨法制备Cu₂O粉末, 研究了球磨时间和不同pH值的水溶液对反应速率及产物形貌、颗粒尺寸的影响。对样品进行了物相分析、颗粒形貌和尺寸分析, 结果表明, 在不同pH值条件下, Cu和CuO粉末球磨时可生成Cu₂O化合物, 随球磨时间的增加, Cu₂O量增加; pH值不同, 球磨反应速度不同, 产物颗粒尺寸大小也不一样。在pH=3时, 球磨反应速度较高; 但pH=12时, 产物颗粒尺寸较小; 在球料比30∶1, 球磨时间90 h, pH=3或pH=12的条件下, 反应完全, 生成Cu₂O, 颗粒形状为立方体、六方体、八面体及其它不规则多边形状, 颗粒尺寸为30～100 nm。     

废旧电视电路板的热解研究

论文研究了脱锡后废旧电视印刷电路板的热解,探索了温度（400、500、600和700℃）对热解固、液、气产物的产率以及产物成分的影响,并采用XRD、SEM、GC、GC/MS等检测手段对热解产物进行了分析表征。研究表明,随着温度上升,气体产率随着温度的上升而有所增加,在700℃时达到最大值13.45%,液体产率在600℃时达最大值17.4%,固体产率随温度上升而减少,最后趋于稳定。Cu、Sn和Ag等金属在固体产物中得到富集,随热解温度升高而波动,600℃时Cu含量达23.46%,可为铜冶炼的原料;气体产物的主要成分为H2,热解温度为600℃时气体产物中的H2含量最大,达到56.9%,热值达到21.23MJ/Nm3,是优良的富氢燃气;液体产物主要产物是苯酚、4-异丙基苯酚等,产物热值较高。废旧电视印刷电路板热解可实现热解固、液、气产物的综合高效利用。     

Sn-9Zn/Cu界面金属间化合物高温时效过程中生长与演变

分析Sn-9Zn/Cu焊点85℃时效条件下界面结构特征与金属间化合物生长动力学,研究150℃时效条件下界面金属间化合物的稳定性及演变。结果表明,85℃时效过程中Sn-9Zn/Cu界面金属间化合物结构稳定,金属间化合物在初始厚度为6.3μm的条件下,生长动力学时间指数为0.536。150℃时效过程中,界面金属间化合物显著发生分解使得界面反应层连续性与致密性下降,钎料中锡穿过界面反应层向铜基板中进行扩散和反应,导致界面中形成金属间化合物Cu_5Sn_5。     

磷石膏固相球磨制备尿素石膏的研究

采用固相球磨制备的方法,以磷石膏和尿素为原料制备尿素石膏.通过单因素实验考察了各工艺条件时反应转化率的影响;再进行正交设计,优化了磷石膏固相球磨制备尿素石膏的工艺参数;并通过XRD对产物进行了物相分析.研究表明,磷石膏固相球磨制备尿素石膏的优化工艺条件为:反应温度为55℃,反应时间为40 min,球料比为6∶1,转速为...     

酸性废水中As(Ⅲ)、Cu(Ⅱ)与铁粉的反应行为

在Fe-As(Ⅲ)-Cu(Ⅱ)-H₂O体系中, 研究了酸性废水中As(Ⅲ)、Cu(Ⅱ)与金属铁粉的反应行为, 考察了反应过程中As在气、液、固三相中的分配比。结果表明, As(Ⅲ)和Cu(Ⅱ)离子被Fe还原为单质As和Cu后, As、Cu进一步结合成Cu₅As₂等金属间化合物, 从而促进As(Ⅲ)沉淀反应的发生, 且无AsH3生成。在反应时间40min、铁粉过量系数1.2、溶液初始pH=0.0、温度40 ℃、Cu/As摩尔比1.0条件下, As在气、液、固三相中的分配比分别为0、20.7%和79.3%, 沉砷率为79.3%。     

高能球磨制备金锡合金钎料

采用高能球磨法制备金锡共晶合金钎料,研究球磨后样品的微观组织随球磨时间的演变规律.XRD的检测结果表明,随着球磨时间的延长,球磨后的样品中依次出现ε相(AuSn_2)、δ相(AuSn)和ζ相(Au_5Sn)等金属间化合物,出现顺序与合金化程度密切相关.SEM及EDX的观察结果表明,随着球磨时间的延长,单质Au粉与Sn粉之间实现了充分的合金化,标志粉末处于焊合过程中的河流状变形带的密度逐渐降低,最后趋于消失,组织整体均匀性提高,获得了成分均匀的共晶合金.     

焊接温度对Cu/Al瞬间液相扩散焊接头性能的影响

采用AC8B铝合金箔,在0.1 Pa真空度下,对Cu/Al异种金属进行瞬间液相扩散连接(Transient Liquid Phase,TLP),并研究了在不同焊接温度下接头区显微组织、不同区域元素的扩散迁移及接头力学性能。结果表明,Cu/Al TLP连接接头界面元素扩散明显,存在一定厚度的扩散层;铜铝两侧扩散层主要由Cu9Al4、Cu Al2金属间化合物组成,且随着焊接温度的变化,金属间化合物种类未发生改变。两侧扩散层的显微硬度明显高于基体母材,随着焊接温度的增加,接头剪切强度呈现出先上升而后下降的趋势,且在焊接温度为500℃时,接头剪切强度达到60.4 MPa。     

从高锡高砷铜阳极泥中浸出铜镍的工艺研究

采用硝酸氧化酸性浸出法从高锡高砷铜阳极泥中浸出铜镍, 主要考察了硝酸添加量、反应温度、硫酸浓度、固液比和反应时间等因素对铜镍浸出效果的影响。实验结果表明, 在铜阳极泥质量20.0 g、2.0 mol/L硫酸溶液100 mL、固液比1/5、浸出温度85 ℃、浓硝酸用量2.0 mL、搅拌速度500 r/min和浸出时间90 min时, Cu和Ni平均浸出率分别达到94.58%和80.22%, 而As、Sb和Sn浸出率仅为4.52%, 1.11%和0.15%, 实现了Cu、Ni从阳极泥中的有效分离。     

Sn-9Zn/Cu界面化合物高温时效过程中的生长与演变

分析了Sn-9Zn/Cu焊点85°C 时效条件下界面结构特征与金属间化合物（IMC）生长动力学,研究了150°C 时效条件下界面IMC的稳定性及演变。结果表明：85°C时效过程中Sn-9Zn/Cu界面IMC结构稳定, IMC在初始厚度为6.3μm的条件下,生长动力学时间指数为0.536;150°C时效过程中,界面IMC显著发生分解使得界面反应层连续性与致密性下降,钎料中Sn元素穿过界面反应层向Cu基板中进行扩散和反应,导致界面中形成Cu6Sn5 IMC。     

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     

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 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,     

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     

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