Process,Microstructure and Properties of the RS-P/M Al-Li Alloy

The Al-Li powder was prepared by argon atomization.The compact Al-Li powder was canned into analuminum container and degassed in vacuum and extruded into a bar at 400℃.The effect of extrusion ratioon the metallurgical consolidation of the powder has been studied,and the relationship of process-microstructure-property and the mechanism of age strengthening in the alloy were discussed also.     

Thermal Oxidation Behavior of TiNi Alloys

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新型高铬镍基合金涂层在H_2S气氛中抗高温腐蚀性能的研究

针对燃煤电厂锅炉“四管”硫化腐蚀的严峻现状 ,采用 2 0钢作为基体材料 ,对自行研制的新型高铬镍基合金 (铬含量在 40 %以上 )涂层和另一种传统的镍铬合金 (Ni70Cr30 )涂层在H2 S气氛中的高温腐蚀动力学规律进行了研究。采用金相显微镜、配有能谱分析仪的扫描电镜以及X射线衍射仪等检测设备对腐蚀产物的形貌和相组成等进行了分析。由新型高铬合金制备的涂层具有优良的抗硫化腐蚀性能 ,适于作为燃煤电厂锅炉“四管”用的防护材料。     

高温超导材料实用化的新进展

高临界温度超导电性的发现至今已逾１１年，今天高温超导体正处于实用化发展的适宜时机，特别是钇系和铋系超导材料。国际材料研究学会９７年秋季大会于１２月１～５日在美国波士顿召开，题为“应用高温超导耐用材料的稳定性”的Ｔ分会场介绍了高温超导工艺及实用化的新进展，一些公司报告了超导工业的进程规划。     

用有机盐燃烧法制备铋系超导粉

用有机盐燃烧法制备铋系超导粉郭旭，袁冠森，周贻茹，曾荣，王敬（北京有色金属研究总院１０００８８）关键词：超导粉，高温超导体，均匀性随着高温超导技术的研究发展，超导体的性能稳定性有着日益重要的地位。对铅系材料而言，由于相结构的复杂性，要在成百米、上千米...     

钇系、铋系高温超导体的研究及潜在应用展望

论述了钇系、铋系高温超导体的内在特点、主要制备方法及其潜在应用的进展情况。     

第七届国际急冷材料会议在瑞典召开

第七届国际急冷材料会议(RQ7)于1990年8月13日至17日在瑞典的斯德哥尔摩召开。参加会议的正式代表314人来自世界33个国家和地区,中国派出9名代表。论文报告近500篇,分10个分会,即:电学性质、磁学性质、力学性质、松弛和动力学、工艺、原子结构、化学性质、轻合金、薄膜材料和机械合金化。许多有关非晶态的基础研究和工艺报告引起人们注     

Microstructures of YBCO Thin Film Deposited on LaAlO_3 Substrate

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J_c-B Characteristics and Microstructure Dependence of J_c of High J_c Bi-based Superconducting Oxide Tapes

Bi-based 2223 superconducting tapes with high critical current densities were prepared by silver-sheathingmethod.The relationship between processing,microstructure and property was discussed.The results of criti-cal current density measurement at 77.7 K with different applied magnetic field are as follows:j_e=2.87×10~4A/cm~2(OT),J_e=4100 A/cm~2(H I.H||S.1T)and J_e-B characteristics are obviously improved withtemperature decreasing from 77 K to 4.2 K.Microstructtlre observations indicate that intermediate pressingwith subsequent heat-trcating could lower the porosity of superconductor inside the silver sheath,and reducethe amount and size of non-superconducting phases,leading phases,leading to the formation of a strong c-axis-orientedtexture,and the emergence of high dislocation density within the 2223 grains,and consequently the J(?)andJ_e-B characteritics were improved.