共查询到20条相似文献,搜索用时 109 毫秒
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加强我国稀土工业的宏观控制作用□北京有色冶金设计研究总院林河成□80年代以来,在国家的改革开放大政方针指引下,在国家高度重视和支持下,我国的稀土工业获得了高速度的发展,并取得了巨大的成就。目前,我国的稀土地质勘探、开采、选矿、冶炼、材料加工和应用等方... 相似文献
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本文介绍了我国台湾省的稀土工业发展主要状况。内容包括稀土资源,稀土原料和产品的生产,稀土产品的应用开拓及发展领域;稀土产品的进出口贸易及市场态势;今后稀土工业的发展前景,并对有关问题作出评价。 相似文献
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江西省科学技术委员会组织省冶金总公司、地矿厅等单位的同志赴包头、天津、北京等地考察了北方稀土的分离、冶炼及稀土应用材料的开发、推广情况,从中得到不少启示,对江西省稀土产业的发展有不少借鉴之处。1稀土行业的发展动态包头作为中国稀土最早被开发利用的代表地... 相似文献
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Rare earth compounds as modifiers used widely in modern friction materials can enhance the interracial binding of constituents of materials and improve the comprehensive properties of materials evidently. However, there are still few reports on application of rare earth in automotive friction materials. In order to study the effect mechanism of rare earths in friction materials, a rare earth compound was selected as additive and the effects of materials doped with or without rare earth on friction and wear properties of materials were studied. The microstructure and worn surface morphology were observed by scanning electron microscopy and the macro performance was discussed. Worn surface element constitution of materials was analyzed by energy dispersive spectroscopy. Effect mechanism of rare earths on friction and wear behaviors of friction materials were discussed. The results show that doping rare earths in friction materials can stabilize friction Coefficient, lower the wear rate of materials and increase the impact strength of materials. The flexibility and fracture resistance of materials is greatly improved. Worn surface of materials doped with rare earth is compact and the surface adhesion is greatly enhanced. 相似文献
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加混合稀土WC—8Co合金的组织和性能 总被引:4,自引:0,他引:4
探讨了添加超细混合稀土氧化物微粉对WC-8Co硬质合金组织结构和性能的优化机理.结果表明,混合稀土氧化物提高WC-8CO合金强韧性的原因,不仅是由于WC晶粒尺寸的细化、不连续长大的粗晶WC的消除和立方钻相含量的提高,还与合金制品宏观应力的增加有关。 相似文献
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张津 《中国稀土学报(英文版)》2004,22(2):272-276
Medium-carbon alloy steel was plasma nitrided with rare earths I_a, Ce and Nd into the nitriding chamber respectively. The nitriding layer microstructures with and without rare earths were compared using optical microscope, normal SEM and high resolution SEM, as well as TEM. It was found that the extent of the influence on plasma nitriding varies with different contents of rare earth. The effect of plasma nitriding is benefit from adding of Ce or Nd. The formation of hard and brittle phase Fe2-3N can be prevented and the butterfly-like structure can be improved by adding Ce or Nd. However, pure La may prevent the diffusion of nitrogen and the formation of iron nitride, and reduce the depth of diffusion layer. 相似文献
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Effect of Rare Earths on Properties of BNbRE Rail Steel 总被引:1,自引:0,他引:1
The development and properties of BNbRE rail steel and the effect of RE on rail steel were studied. The results show that the properties of rail steel (δb ≥980 MPa, δ5≥ 8 % ) can be improved by adding RE and niobium and adjusting the content of C, Si and Mn in steel. At the same time, the abrasion resistance, contact fatigue and fatigue property of BNbRE rail steel are excellent. It also shows that RE in rail steel has the functions of purifying steel, modifying inclusion and micro-alloy action effect. The improved steel-making process enhances the quality of molten steel. Although the content of RE is low, excellent properties of BNbRE rail steel are achieved. 相似文献
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