钨铜复合材料用钨骨架的制备与压缩性能

发布时间：2018-01-18 16:16

本文关键词：钨铜复合材料用钨骨架的制备与压缩性能　出处：《粉末冶金材料科学与工程》2017年05期 　论文类型：期刊论文

【摘要】：采用电子束选区熔化成形得到点阵结构钨样件,然后填入细钨粉松装烧结成多孔体,制备钨铜复合材料用的钨骨架,对点阵结构与多孔体的形貌与结构进行观察与分析,并测试点阵结构与钨骨架的压缩性能。结果表明:钨点阵结构的孔结构完整,孔筋内部无孔洞、裂纹等缺陷,并且组织细小。点阵结构的抗压强度高,但韧性较差,压缩过程几乎为瞬间脆性溃散。采用分段烧结的方法在点阵结构内部引入微米级多孔体,点阵结构与多孔体相互嵌套形成复合结构的钨骨架,骨架的压缩断裂经历单独点阵结构受力点阵结构微弱变形协同受力开裂坍塌的过程,表现为一种混合断裂模式,避免了单独点阵结构的瞬间脆性坍塌。
[Abstract]:The tungsten sample with lattice structure was obtained by electron beam selective melting forming, then the tungsten skeleton of tungsten copper composite was prepared by filling in fine tungsten powder and sintered into porous body. The morphology and structure of lattice structure and porous body were observed and analyzed, and the compression properties of lattice structure and tungsten skeleton were tested. Cracks and other defects, and fine microstructure, high compressive strength of the lattice structure, but the toughness is poor, the compression process is almost instantaneous brittle collapse. The micro-size porous body is introduced into the lattice structure by the method of piecewise sintering. The tungsten skeleton of the composite structure is formed by nesting the lattice structure and the porous body. The compression fracture of the skeleton goes through the process of weak deformation and crack collapse of the single lattice structure and the lattice structure. It is shown as a mixed fracture model, which avoids the instantaneous brittle collapse of a single lattice structure.
【作者单位】：西北有色金属研究院金属多孔材料国家重点实验室;
【基金】：国家高技术研究发展计划(“863”计划)资助项目(2015AA034304) 国家重点研发计划资助项目(2016YFB1101403)
【分类号】：TB331
【正文快照】： 钨铜复合材料同时具有铜的高导电导热性能、以及钨的高温强度高、抗电弧烧蚀性能优良的特性,在电力、电子、冶金等领域得到广泛应用,尤其是在各类高压电器开关的电触头方面有着重要的应用[1-3]。传统的钨铜复合材料多采用钨粉烧结制备骨架而后进行高温渗铜的方法制备,钨骨架中

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