Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7989860 | International Journal of Refractory Metals and Hard Materials | 2018 | 6 Pages |
Abstract
In this work, novel high-voltage electrical contacts of the W-Cu composites reinforced with tungsten fibers (Wf) have been fabricated by hot-press sintering and infiltration processes. Considering microstructural homogeneity and fabrication repeatability of the composites, Wf with the content of 3.3 wt% was determined to be optimum for the reinforcement. By electroless deposition of ~ 2.5 μm thick nickel layer onto the surface of Wf, the connectivity between the Wf and its neighboring W-Cu matrix after sintering and infiltration was improved with the elimination of porosity. This was considered to be ascribed to the plastic deformation of Ni-coatings during the molding of green compacts and the improvement of rearrangement of tungsten particles (Wp) during the Ni-activated sintering. Compared with the traditional commercial W-Cu composites, the W-Cu composite reinforced with the Ni-coated Wf provided desirable increased tensile strength by ~ 15.8% and improved electrical breakdown strength by 65.3% after the interface tuning, which is applicable and transferrable to other refractory metals for property improvement.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Longchao Zhuo, Yiheng Zhang, Qiuyu Chen, Shuhua Liang, Long Chen, Juntao Zou,