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Ultrasonic vibration assisted tungsten inert gas welding of dissimilar magnesium alloysFangzhou Yang1,2,Jie Zhou1,Rongrong Ding11. College of Materials Science and Engineering,Chongqing University2. The School of Robot Engineering and Mechanical-Electrical Engineering,Chongqing University of Arts and Sciences摘 要:The effects of ultrasonic vibration......
, tungsten-based alloys including element Fe have been drawn much attention because of their advantages of high melting point, high density, high elastic modulus, and resistance to neutron and gamma... based heavy alloys prepared by liquid phase sintering technique [J]. International Journal of Refractory Metals & Hard Materials, 2009, 27: 577-583. [18] RAMOS-DELGADO N A, GRACIA-PINILLA M A, MAYA......
Article ID: 1003-6326(2005)06-1333-08 Microstructure and wear properties of tungsten carbide reinforced steel matrix composites YOU Xian-qing(尤显卿)1, SONG Xue-feng(宋雪峰)1, REN Hao(任 昊...]. Tungsten carbide has high hardness, good wear resistance and impact as well as strong wetting cohesion between duplex phase, i.e. WC phase and matrix phase. Over the last decade, attempts to produce WC......
热挤压,冷扭转复合工艺制备钨合金的绝热剪切敏感性 孙常青1,郭伟2,倪芳2,郑海云1,李树奎2,刘金旭2 (1.国营121厂,黑龙江,牡丹江,157000;2.北京理工大学,北京,100081) 摘要:对烧结态93W-4.5Ni-2.1Fe-0-35Co钨合金进行热挤压变形强化,获得纤维组织,再通过冷扭转变形调整纤维状钨颗粒的取向,对压,扭复合工艺制备的钨合金进行动态雎缩性能测试和绝热剪切敏感性的分析,并与烧结态和冷扭转态钨合金作对比研究.结果表明,热压,冷扭复合工艺制备的钨合金在具备高屈服强度的同时,具备了较高的绝热剪切敏感性.微观分析表明,热压,冷扭复合工艺改变了条状粘结相组织的受力状态和分布状态,从而导致钨合金绝热剪切敏感性的提高. 关键词:钨合金; 绝热剪切; 纤维晶粒取向; 动态压缩; tungsten heavy alloy; adiabatic shear band......
the ultrafine-grained W-1.0wt.%La2O3 alloys by pressureless sintering. Compared with pure tungsten, W-1.0wt.%La2O3 alloys exhibit ultrafine grains and excellent mechanical properties. After sintering... and impurity distribution of the tungsten-based alloys. In such a case, the most widely-used pathway is to refine their microstructure [14-16], since it not only increases the final strength but creates......
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-containing tungsten ore; dressing wastewater; turbidity; COD; heavy metal 选矿废水排放量大,成分复杂,水中重金属离子,固体悬浮物和化学需氧量等超过GB 8978-1996(<污水综合排放标准>),对选矿企业周边环境造成较大的潜在污染[1].开展选矿废水净化处理及重复利用对减轻周边水体污染至关重要.选矿废水处理方法主要有自然降解法,酸碱中和法...选矿废水净化效果比较 Table 5 Coagulation effciency of PSAFS, PSFS, PSAS and PS on COD, turbidity and heavy metals in wastewater 图5所示为聚硅酸和聚硅酸硫酸铝铁的SEM照片.从图5可以看出:适宜配比的聚硅酸硫酸铝铁絮凝剂绝大部分呈细薄的片状结构,比表面积显著增大,与聚硅酸相比......
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