为了提高熔模铸造硅溶胶型壳的性能,向涂料中添加硅酸铝纤维制备纤维增强熔模铸造型壳试样.对不同纤维加入量条件下所获得的纤维增强型壳试样的常温及焙烧后抗弯强度、高温自重变形量的变化规律进行研究,并利用SEM观察型壳试样断口形貌.结果表明:随硅酸铝纤维加入量从0.2％～1.0％(质量分数,下同)变化,其常温抗弯强度显著增大,高温自重变形量减小;纤维加入量为1.0％时,试样的常温抗弯强度较未增强的试样提高了47％,而高温自重变形减少约50％.采用0.2％～1.0％的硅酸铝纤维增强后,复合型壳焙烧后强度至少提高39％.断口SEM形貌观察分析结果表明,纤维增强硅溶胶型壳试样受力破坏失效主要由于硅溶胶凝胶膜的断裂、硅酸铝纤维拔出、断裂及脱粘等综合作用所致.
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