中文摘要：

牛皮纸浸酚醛树脂,经叠层、固化、碳化,最后,埋入硅粉中,在N2气保护下加热到1400℃,再抽真空并升温至1550℃,保温60min,使碳化样品与液态硅充分反应,制备了SiC/Si层状陶瓷复合材料。复合材料的密度、强度分别为2.20g/cm3和435MPa。将SiC/Si层状复合材料分别在氮气和真空中,于1440℃进行再热处理。研究了再热处理后材料的组成、显微结构和气孔率、强度等物理性能。结果表明:在氮气气氛下再热处理60min,样品的密度、强度分别达2.32g/cm3和455MPa,此时,因SiC/Si层状复合材料中Si与C经扩散迁移而反应形成更多的SiC,使材料的密度、强度提高。在真空环境中1400℃再热处理30min,样品的密度、强度分别为2.12g/cm3和430MPa,这是由于Si蒸发,样品的质量减少,气孔率大幅度增加,因此,密度和强度略有下降。

英文摘要：

Carbon templates were prepared by kraft papers impregnated with phenol resin,and after laminated,drying and carbonization,packed with silicon powder and heated to 1 400 ℃ in N2 atmosphere.They were heated to 1 550 ℃ in vacuum for 60 min,and the subsequent reaction resulted in a laminar SiC/Si composite with a density of 2.20 g/cm3 and strength of 435 MPa.The laminated SiC/Si composites were retreated under nitrogen atmosphere and vacuum separately at a temperature of 1 400 ℃ for 30 min.The results show that...