放电等离子烧结法制备涂层导体用Ni合金复合长带

采用放电等离子烧结技术(SPS)制备出表层为Ni-5%W(摩尔分数)合金、芯层为Ni-12%W(摩尔分数)合金的复合坯锭,经热轧和冷轧后获得长度为10 m的复合基带.结果表明:冷轧基带界面连接性良好,能够满足大变形量冷轧工艺的要求.对复合基带的厚度及织构均匀性分析表明,在全长度范围内基带的厚度为(75±3) μm,其外层立方织构含量均在97%(＜10°)以上,与商业化Ni5W基带水平相当.同时,对其力学性能与磁性能进行分析,结果表明复合长带的屈服强度为240 MPa,饱和磁化强度仅为Ni5W基带的40%.采用复合坯锭路线在规模化生产高性能复合基带方面具有一定的应用潜力.     

有机过渡金属络合物均相催化发展及展望

介绍了国内外均相络合催化的研究及发展,并对均相络合催化的发展方向进行了展望。     

膨胀机效率的计算

确定膨胀机效率,对于正确指导膨胀机应用有着重要意义。膨胀机效率计算包括平衡常数、焓、熵、冷凝计算等基础过程,而这些过程的计算又依赖于状态方程。整个计算过程十分繁琐,手工计算难以完成。本文采用扩充的“PR”状态方程,编制了计算机程序(见图1),获得了较好的效果。     

混合型（双组分）抗菌沸石在塑料PP中的应用

为了改进单组分抗菌沸石ＭＪＺ的不足,制备了混合型抗菌沸石ＭＭＪＺ,抗菌母粒ＭＭＪＺＢ和含有抗菌母粒ＭＭＪＺＢ的聚丙烯ＰＰ塑料,并测试了系列抗菌塑料ＭＭＪＺＢ－ＰＰ的抗菌性能。     

盐酸除锈最佳浓度的选择

１　前言目前国内大多数热浸镀锌、渗锌、电镀锌、电镀多元合金,去除钢铁表面的锈蚀均采用盐酸除锈的方法。由于强调生产,追求产量,使酸洗液一直处于较高的浓度,而忽视了酸洗液的最佳浓度的控制与维护。许多厂家不知道控制酸洗液的浓度,而简单地采取每周更新一次酸液,有些则一年更新两次,有的甚至从未更新。通常是倒掉一些酸洗液,添加一些新酸洗液。造成盐酸耗量过高,增加生产成本,并对环境造成一定的污染。因此,掌握与控制盐酸酸洗液的实用寿命具有一定的经济意义。２　盐酸除锈机理使用盐酸去除钢铁表面的铁锈时,一般认为有三…     

论我国水泥工业可持续发展的战略步骤

１９９９年伊始,我国决定正式启动为期５０年的“中国生态环境规划”。这是一项意义深远的重大决策,拉开了我国经济致力于可持续的序幕。呼呈我国水泥界应高度重视并积极推行实施ＩＳＯ１４０００环境管理系列和水泥厂大气污染物新排放标准ＧＢ４９１５－１９９６,并马这两个标准的贯彻作为我国水泥工业可持续发展战略的具体实施步骤。     

PVC—U芯层发泡管成型工艺及装备

本文着重论述新型复合发泡管成型工艺及材料,同时对发泡管挤出设备、工艺特点、基本原理及工艺参数控制等结合实践经验,阐述了我们的观点,供大家参考。     

4—甲醛基重氮氨基偶氮苯的合成及其与汞显色反应的研究

合成了一种新三氮烯显色剂－－４－甲醛基重氮氨基偶氮苯,并研究了该显色剂与汞（Ⅱ）的显色反应,建立了测定汞的新的分光光度法。此方法简便,灵敏度高。     

45kW CO2激光器大面积CSiB+NiMoCo合金化研究

用45kW CO     

Microstructure characterization of reinforcements in in-situ synthesized composites of Al-Zr-O system

A novel in-situ reaction system Al-Zr-O was developed. In-situ Al3Zr and Al2O3 particulates reinforced aluminum matrix composites were fabricated by the direct melt reaction technique in the Al-Zr-O system. Microstructures of the composites and crystal morphology of in-situ formed Al3Zr and Al2O3 particulates were analyzed by scanning electron microscope (SEM) and transmission electron microscope (TEM). Results indicate that in-situ formed Al3 Zr and Al2O3 particles are finer and well distributed in aluminum matrix. Al3Zr particulates with a tetragonal structure are mainly in the shape of polyhedron. A few of them are in the form of rectangle. The length/width ratio of the rectangular Al3Zr is less than 2.0 and the maximum size is 2μm. In addition, a certain number of Al2O3 submicro particles with a hexagonal structure are also generated in this system. Furthermore, it is found that Al3Zr crystal grows by the mechanism of twinning. The twin plane is (114). The twinning direction is [221]. The tensile tests show that the composites synthesized in the Al-Zr-O system exhibits high strength and ductility. There are a lot of ripples with fine particles on the fracture. The principal strengthening mechanisms for (Al3Zr Al2O3 )p/Al composites may include Orowan strengthening, grain-refining strengthening, solid-solution strengthening and dislocation strengthening.