(1. 合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，合肥 230009； 2. 安徽省有色金屬材料與加工工程實(shí)驗(yàn)室，合肥 230009)
摘 要: 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。
關(guān)鍵字: W/Si復(fù)合材料；放點(diǎn)等離子燒結(jié)；抗激光沖擊性能
（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
