W/Si復合材料的制備及抗激光沖擊性能

W/Si復合材料的制備及抗激光沖擊性能Preparation and laser shock resistance of W/Si composites

采用機械合金化和放電等離子體燒結(1700 ℃，44.1 MPa)的方法成功制備W/Si復合材料，并通過SEM、EDS、XRD等分析手段以及顯微硬度測試和激光熱沖擊試驗對其組織結構、顯微硬度及抗熱沖擊性能進行研究。結果表明：燒結后試樣隨Si含量的增加依次生成W5Si3和Si2W中間相，該結果與W-Si二元相圖完全吻合。激光沖擊后試樣表面呈現出3種不同形貌：熔融區、影響區及未影響區(邊緣區)。相較于其他試樣，W/5%Si(質量分數)復合材料的晶粒小、硬度高，具有較好的抗熱沖擊性能。

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.

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