WC—Co硬质合金的γ相成分

依据ＷＣ－Ｃｏ硬质合金各相含量间的关系，推求出两相（ＷＣ＋γ）合金中γ相成分极限和碳含量宽度。结果表明，对于两相ＷＣ－Ｗｏ合金，其γ相成分（钨和碳在γ相中的固溶度ＸＷ和ＸＣ）与合金钴配量和碳含量有关且存在关系：ｘｗ＝１３７９ｘｃ＋１．４７－３７．１ｘｃ，但其两相区上下限γ相成分与合金钴配量无关，分别为ｘｗ：０．０７５２和０．２３４，ｘｃ：０．００４９１和０．００２４８（Ｗｔ）：ＷＣ－Ｃｏ合金两相区上下限碳含量和γ相含量（ｗｔ．）与合金钴配量有关，其两相区的碳含量宽度与合金钴配量有正变关系。对上述结果进行了实验验证。     

掺Cu/Ti中间相碳合金的制备及其高温摩擦磨损性能研究

采用机械合金化法将金属Cu,Ti掺杂到煤焦油沥青碳质中间相中,制备出掺Cu/Ti中间相碳合金。利用X射线衍射仪(XRD)分析了所制备中间相碳合金的晶体结构;通过高温端面摩擦试验研究了添加中间相碳合金润滑油的高温摩擦磨损性能;用SEM观察摩损表面的形貌,激光Raman光谱仪分析磨损表面碳的结构特征。结果表明,机械合金化掺杂金属Cu,Ti后,中间相碳合金的结晶有序度下降,向无定形结构转变;添加了中间相碳合金的润滑油,其高温减摩抗磨性得到优化,而且其减摩抗磨性能随着载荷的增大而大幅度提高;在高温摩擦机械作用下,增加载荷将促使磨损表面碳质材料的有序程度增加,其摩擦性能也越好。     

磨矿介质对钼精矿碳含量影响研究

分析研究了低铬合金铸球和复相球墨铸球中碳的赋存状态及其对普通钼精矿、57钼精矿和二硫化钼粉碳含量的影响,指出用浮选法生产低碳57钼精矿,一段磨矿介质不宜使用复相球墨铸球.     

57钼精矿含碳高原因分析研究

分析研究了低铬合金铸球和复相球墨铸球中碳的赋存状态及其对普通钼精矿、57钼精矿和二硫化钼粉碳含量的影响,指出用浮选法生产低碳57钼精矿,一段磨矿介质不宜使用复相球墨铸球。     

WC－Co硬质合金中η_1相和碳含量的磁性测定原理

根据三相ＷＣ－Ｃｏ硬质合金中η＿１相和碳含量的求值公式和影响比饱和磁化强度４πσ的诸因素论述了用４πσ测定三相ＷＣ－Ｃｏ硬质合金中η＿１相和碳含量的原理。结果表明，用滋性方法测定ＷＣ－Ｃｏ合金的η＿１相和碳含量是精确的非破坏性检验方法，对于η＿１相和碳含量的测定精度分别为千分之三和万分之一。     

Zn,Ag在Al-3.3Cu-1.1Li-0.4Mg-0.1Zr铝锂合金中的微合金化作用

采用透射电子显微镜和力学性能测试,研究了0.4, Zn,0.4, Ag在Al-3.3Cu-1.1Li-0.4Mg-0.1Zr铝锂合金不同热处理状态的微合金化作用.结果表明,T6态时效(175℃)时,含Zn的2070合金强度明显低于含Ag的2050合金;T8态时效(5,冷轧预变形+155℃时效)时,两种合金的强度提高,延伸率增加,但强度差值减小.T6态和T8态时,两种合金析出相均为大量T1相(Al2CuLi)和部分θ''相(Al2Cu).T6态时效时,2070合金中T1相密度低于2050合金;T8态时效时,两种合金中T1相密度增加,但差别减小,即T8时效时,由于位错的引入掩盖了Mg+ Zn与Mg+Ag的微合金化作用效果.     

Co基非晶软磁合金薄带的制备和磁学性能

研究钴基非晶态软磁合金薄带的制备工艺,采用X射线衍射、透射电子显微镜分析非晶态合金条带的显微结构及非晶化程度,用差热分析法测量合金的玻璃转变温度和晶化温度,并研究其晶化行为,用振动样品磁强计（VSM）测量合金的静态磁学性能.结果表明,非晶态合金DTA曲线上有一个明显的吸热峰和两个明显的放热峰,合金的初始晶化温度为773K,第二个晶化温度为853K,说明该体系具有较强的热稳定性和非晶形成能力.在条带晶化过程的不同阶段,相组成不同,773K时是Co3B相和Co2Si相,823K和853K除了前面的两相外,又出现了Co2B相.非晶态Co73Si10B17合金在室温下呈现优异的软磁性能,不同退火工艺对磁性能有显著的影响.     

稀土Er元素对6063合金时效处理的影响

用硬度测试,金相分析,透射电镜分析等方法研究Er元素对轧制后6063合金时效过程中β″相析出的影响,结果表明Er元素的加入对固溶后的合金再结晶晶粒长大有非常明显的抑制作用,适量的Er元素有助于合金力学性能的改善,与合金生成的Al3Er相对合金β″相的析出有促进作用,加快了β″相的析出。     

新型钴基高温合金长期时效组织演化研究

新型钴基高温合金具有比镍基高温合金更高的γ′强化相稳定温度,其有望替代镍基高温合金应用于涡轮盘等服役环境苛刻的工程部件。为了解决钴基高温合金长期服役环境下的组织稳定性,对两种不同C含量的新型钴基高温合金进行900℃长期时效研究,系统解析了铸造态和固溶时效2种处理条件下γ′相和碳化物的尺寸、分布、成分和形貌演化规律。研究结果表明：两种钴基高温合金中γ′相的粗化均遵循LSW熟化理论,固溶时效态合金中γ′相的粗化速率高于铸态合金;含C钴基高温合金中的碳化物形貌和尺寸在长期时效过程中未见明显变化,当时效时间达到5000 h后,碳化物周围出现无析出区,并且固溶时效态合金中碳化物周围的无析出区面积更大,这主要是Ta、Ti等元素扩散降低了γ′相的热稳定性并发生溶解造成的。     

快淬制备Mg3LaNi0.1合金的相结构转变与储氢性能研究

首先采用感应熔炼方法制备Mg3LaNi0.1合金,合金由Mg3La和LaMg2Ni两相组成,利用单辊旋淬的方法将熔融合金快速冷却,快冷后合金中的LaMg2Ni相消失,而由单一的Mg3La相组成.将快冷后合金置于氩气保护气氛中自然时效,随着时间增长,Ni逐渐析出而LaMg2Ni相重新形成.经过快淬和时效处理的Mg3LaNi0.1合金储氢特性较常规熔炼制备的合金有所改善,储氢量约3.1%,室温下3min内能吸氢2.7%,最低放氢温度为224℃.     

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     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。