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Abstract
采用凝胶注模(gel-casting)成型工艺并结合一种先进的消失模技术, 制备了具有各种不同轻量化结构形式的碳化硅(SiC)陶瓷素坯, 目前制备的背部半封闭素坯最大尺寸为1080 mm×820 mm; 素坯经过脱模、干燥、脱脂和反应烧结等, 可得到空间用SiC反射镜坯体. 对反应烧结碳化硅(RB-SiC)反射镜坯体的表面进行了光学加工, 并且测试了其各项性能. 结果表明, 所制备的RB-SiC陶瓷内部结构均匀致密; 力学性能和热学性能优异, 弹性模量、抗弯强度、断裂韧性和热膨胀系数分别达到了330 GPa, 340 MPa, 4.0 MPa<I>&#</I>8226;m1/2和2.6×10-6 K<sup>-1</sup>; 镜体经抛光后的表面粗糙度RMS值优于3 nm, 可作为空间用反射镜的候选材料.
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