W/Si復(fù)合材料的制備及抗激光沖擊性能

W/Si復(fù)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(jī)械合金化和放電等離子體燒結(jié)(1700 ℃，44.1 MPa)的方法成功制備W/Si復(fù)合材料，并通過(guò)SEM、EDS、XRD等分析手段以及顯微硬度測(cè)試和激光熱沖擊試驗(yàn)對(duì)其組織結(jié)構(gòu)、顯微硬度及抗熱沖擊性能進(jìn)行研究。結(jié)果表明：燒結(jié)后試樣隨Si含量的增加依次生成W5Si3和Si2W中間相，該結(jié)果與W-Si二元相圖完全吻合。激光沖擊后試樣表面呈現(xiàn)出3種不同形貌：熔融區(qū)、影響區(qū)及未影響區(qū)(邊緣區(qū))。相較于其他試樣，W/5%Si(質(zhì)量分?jǐn)?shù))復(fù)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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