高性能Si—α-SiC—β-SiC复合涂层的研究  

High Performance of Si—α-SiC—β-SiC Multi-coating for C/C Composites

作　　者：张玉涛[1] 黄剑锋[1] 曾燮榕[2] 熊信柏[2] 邓飞[1] 曹丽云[1] 吴建鹏[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,西安710021 [2]深圳大学材料科学与工程学院,深圳518000

出　　处：《人工晶体学报》2007年第3期696-698,共3页Journal of Synthetic Crystals

基　　金：陕西省自然科学基金(No.2005E108);教育部"新世纪优秀人才支持计划"基金资助

摘　　要：以硅粉、石墨粉为包埋原料及MgO、Al2O3和B2O3等为促渗剂,采用二次固渗工艺在C/C复合材料表面制备了Si—α-SiC—β-SiC复合涂层。并采用X射线衍射(XRD)和扫描电子显微镜(SEM)对复合涂层进行了表征。结果表明:一次固渗后的涂层为Si-β-SiC涂层,两次固渗后可以获得致密的Si—α-SiC—β-SiC复合涂层,涂层厚约300μm,具有致密的表面和断面结构,没有开裂和孔隙等缺陷。氧化性能测试表明:在1500℃的静态空气气氛下氧化200h后,Si—α-SiC—β-SiC复合涂层能对C/C复合材料进行有效保护,涂层试样的失重仅为4.42×10-4g.cm-2。High performance oxidation resistant Si-α-SiC-β-SiC coatings for C/C composites were prepared by a two-step pack cementation method using silicon, graphite powders as source materials and Al2O3 , MgO, B2O3 as infiltration additives. The as-prepared multi-coatings are characterized by XRD and SEM. Results show that Si-β-SiC coatings are obtained after the first step pack cementation; and the Si-α-SiC-β-SiC multi-coatings can be achieved after the second step pack cementation. The asprepared Si-α-SiC-β-SiC multi-coatings with the thickness of about 300μm possess of dense surface and cross-section microstructures. No pin-holes and microcracks are observed. Isothermal oxidation tests in air at 1500℃ show that the weight loss of the as-obtained Si-α-SiC-β-SiC coating coated C/C composites after 200h is only 4.42 ×10^-4g·cm^ -2

关 键 词：C/C复合材料 涂层 抗氧化 

分 类 号：TB43[一般工业技术]