磁黄铁矿的同质多象变体及其选别性质差异

有色金属矿中常伴生一种或多种变体磁黄铁矿，不同变体磁黄铁矿的选别性质不尽相同。本文采取多种测试分析方法，探讨磁黄铁矿的成分变化与晶体结构变化的关系，以及不同变体磁黄铁矿的磁性，可浮性变化的特征。     

Metal hydride air conditioner

The relationship among the hydrogen storage properties, cycling characteristics and thermal parameters of the metal hydride air conditioning systems was investigated. Based on a new alloy selection model, three pairs of hydrogen storage alloys, LaNi4.4 Mn0.26 Al0.34 / La0.6 Nd0.4 Ni4.8 Mn0.2 Cu0. 1, LaNi4.61Mn0. 26 Al0.13/La0.6 Nd0.4 Ni4.8 Mn0.2 Cu0. 1 and LaNi4.61 Mn0.26 Al0.13/La0.6 Y0.4 Ni4.8 Mn0. 2, were selected as the working materials for the metal hydride air conditioning system. Studies on the factors affecting the COP of the system showed that higher COP and available hydrogen content need the proper operating temperature and cycling time,large hydrogen storage capacity, flat plateau and small hysterisis of hydrogen alloys, proper original input hydrogen content and mass ratio of the pair of alloys. It also needs small conditioning system was established by using LaNi4.61 Mn0.26 Al0. 13/La0.6 Y0.4 Ni4.8 Mn0.2 alloys as the working materials, which showed that under the operating temperature of 180℃/40℃, a low temperature of 13℃ was reached, with COP =0.38 and Wnet =0.09 kW/kg.     

时效温度对铝锂合金裂纹扩展方式影响的半定量研究

以2090 Ce合金为研究对象,测试不同时效温度、时间的断裂韧性,并对试样断口进行半定量分析,探讨时效工艺、断裂韧性及断裂机制之间的响应关系。研究表明,2090 Ce合金的断裂韧性试样以分层开裂为主要断裂方式。分层开裂与时效温度有密切关系,随时效温度升高,分层比例增大,厚度变薄。分层开裂亦与应力状态、晶界强度有密切关系,分层裂纹最先在三向应力的作用下于试样中心的晶界处形成,平行承载的薄板处于平面应力状态,裂尖前方塑性区扩大,消耗较多塑性变形功,从而达到增塑作用。时效温度和时间对断裂韧性临界裂纹尺寸影响很小。     

镁合金在摩托车及自行车上的应用现状及前景展望

阐述了镁合金的特点,并介绍了镁合金在摩托车和自行车上的应用现状,同时对镁合金在摩托车和自行车上的应用前景进行了展望,最后指出我国镁合金在发展过程中面临的问题和机遇.     

新型高强耐磨青铜的组织与性能研究

铝青铜由于具有较高的强韧性与耐蚀性，因此，被广泛应用于国民经济的各个部门之中。但随着工业与高科技的快速发展，对性能提出了更高的要求。例如，传统的铝青铜（典型牌号ＺＱＡ１９－４），其抗拉强度约为５００ＭＰａ，很难满足重载荷下工作的零部件（如轧机轴瓦蜗轮等），加之，在润滑不良时，对轴颈有“咬卡”现象。本文在分析传统铝青铜材料组织、性能的基础上，利用计算机辅助的数量冶金学方法进行了合金的最优化设计，开发了一种性能最优的新型铝青铜材料（简称ＹＨ１合金）。该材料的强度比ＺＱＡ１９－４提高约２５％，耐磨性、塑性、韧性与切削加工性均优于ＺＱＡ１９－４，成本低廉，具有广泛的应用前景。论文还进一步分析了新材料强化的机理。     

稀土应用开发的新趋向

本文对有可能实现商品化的稀土应用开发新领域：稀土硫化物颜料、柴油发动机用催化剂、铝电解用非自耗涂层阳极、固体氧化物燃料电池、含钪Ａｌ－Ｌｉ合金等的现状和前景做了扼要介绍。小批量、多品种、高效益是稀土作为独立行业的成功之路。     

KBSG-R矿用隔爆型干式变压器的励磁涌流防止及对策

合空载R型卷绕式移动变电站会产生数值相当大的励磁涌流,易造成移动变电站保护装置的误动作。针对这一问题,理论分析利用控制三相合闸时间来削弱励磁涌流更具有潜力。     

铜基块体非晶合金的研究进展

简要介绍了制备铜基块体非晶合金的各种方法，综述了铜基块体非晶合金的力学性能、耐腐蚀性能、热稳定性．分析了晶化过程的热力学行为，并对铜基块体非晶合金的发展进行了概述．     

装配式防静电地板施工技术探讨与分析

广州某电信信息综合大楼大型计算机房二期工程采用了装配式防静电瓷质地板作为地面铺设方案。本文详细记录了装配式防静电地板的施工过程和其间采用的工艺，以及工程进展中的一些技术问题的解决方案。总结了施工所得的经验，作为今后从事类似工程的技术积累。     

Aluminum alloy tubular columns—Part I: Finite element modeling and test verification

A numerical investigation on fixed-ended aluminum alloy tubular columns of square and rectangular hollow sections is described in this paper. The fixed-ended column tests were conducted that included columns with both ends transversely welded to aluminum end plates using the tungsten inert gas welding method, and columns without welding of end plates. The specimens were extruded from aluminum alloy of 6061-T6 and 6063-T5. The failure modes included local buckling, flexural buckling, interaction of local and flexural buckling, as well as failure in the heat-affected zone (HAZ). An accurate finite element model (FEM) was developed. The initial local and overall geometric imperfections were incorporated in the model. The non-welded and welded material nonlinearities were considered in the analysis. The welded columns were modeled having different HAZ extension at the ends of the column of 25 and 30 mm. The nonlinear FEM was verified against experimental results. It is shown that the calibrated model provides accurate predictions of the experimental loads and failure modes of the tested columns. The load-shortening curves predicted by the finite element analysis are also compared with the test results.