(1. 合肥工业大学 材料科学与工程学院，合肥 230009； 2. 安徽省有色金属材料与加工工程实验室，合肥 230009)
摘 要: 采用机械合金化和放电等离子体烧结(1700 ℃，44.1 MPa)的方法成功制备W/Si复合材料，并通过SEM、EDS、XRD等分析手段以及显微硬度测试和激光热冲击试验对其组织结构、显微硬度及抗热冲击性能进行研究。结果表明：烧结后试样随Si含量的增加依次生成W5Si3和Si2W中间相，该结果与W-Si二元相图完全吻合。激光冲击后试样表面呈现出3种不同形貌：熔融区、影响区及未影响区(边缘区)。相较于其他试样，W/5%Si(质量分数)复合材料的晶粒小、硬度高，具有较好的抗热冲击性能。
关键字: W/Si复合材料；放点等离子烧结；抗激光冲击性能
（1. School of Material Science and Engineering, Hefei University of Technology, Hefei 230009, China; 2. Laboratories of Nonferrous Metal Material and Processing Engineering of Anhui Province, Hefei 230009, China）
Abstract:W/Si composites were produced through powder metallurgy and subsequent spark plasma sintering (SPS) at 1700 ℃ and 44.1 MPa. SEM, EDS, XRD analysis, microhardness and laser thermal shock tests were used to characterize these microstructure and properties of W/Si composites. The results show that W5Si3 and Si2W phases generate in sequence with the increase of Si element, which corresponds well with the binary phase diagram of W-Si. The laser irradiated surfaces are roughly divided into three parts: the melting region (the center), unaffected region (the edges), and the affected area (between the two regions). Comparing with different samples, W/5%Si (mass fraction) samples seem to possess the relatively better thermal shock resistance due to the smaller grain size and higher microhardness.
Key words: W/Si composite; spark plasma sintering; laser shock resistance
