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| Effect of Si content on microstructure and performance of W-Si composite prepared by plasma sintering |
| ZHANG Fei-tian |
| Aero Engine Corporation of China, Beijing 100039, China |
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Abstract The W/Si composites with different Si contents were prepared by mechanical ball milling and spark plasma sintering, and their microstructure and laser shock resistance were tested and analyzed. The results show that the powder distribution after ball milling treatment is more uniform and shows obvious refinement. With the increase of Si content, the degree of powder agglomeration gradually increases and reaches the maximum at 30% Si content. Si2W and W5Si3 phases are formed in the sintered sample. After sintering the W/Si composite powder, its density increases and its fracture mode is intergranular fracture type. When the mass percent of Si is 5%, the hardness of the composite is the highest, which is 1 146 HV. Three types of regions are formed on the surface of the composites after laser thermal shock, including melting region, affected region and unaffected region. The samples with higher damage degree are composites with 15%Si and 30%Si.
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Received: 26 January 2018
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2019, Vol. 29 
