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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

Al粉作为活性填料对PIP法SiCf/SiC复合材料性能的影响

朱云洲1,2, 黄政仁1, 董绍明1, 袁 明1,2, 江东亮1
   

  1. (1. 中国科学院上海硅酸盐研究所, 上海 200050; 2. 中国科学院研究生院, 北京 100049)
  • 收稿日期:2006-10-09 修回日期:2006-11-21 出版日期:2007-09-20 网络出版日期:2007-09-20

Effect of Active Al Fillers on Properties of PIP-derived SiCf/SiC Composites

ZHU Yun-Zhou1,2, HUANG Zheng-Ren1, DONG Shao-Ming1, YUAN Ming1,2, JIANG Dong-Liang1

  

  1. (1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China)
  • Received:2006-10-09 Revised:2006-11-21 Published:2007-09-20 Online:2007-09-20

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摘要： 利用2.5D SiC纤维预制件, 通过前驱体浸渍裂解法(PIP法)制备SiCf/SiC复合材料, 通过在第一次浸渍浆料中加入活性Al粉和惰性颗粒SiC粉来提高浸渍效率. 研究了活性填料的加入以及纤维表面热解碳层的厚度对材料性能的影响. 结果表明, 由于Al粉在热解过程中与含碳有机小分子发生化学反应生成新的物相, 使得复合材料的力学性能得到了很大的提高, 在1200℃经过六个周期的浸渍裂解后, 复合材料的三点弯曲强度达到441MPa, 比例极限应力达到380MPa. 在200～500nm厚度范围内, 热解碳的厚度对复合材料的抗弯强度影响不明显. 复合材料的弹性模量随着热解碳层厚度的增加而降低.

关键词: SiCf/SiC复合材料, 活性填料, 前驱体浸渍裂解, 力学性能

Abstract: SiCf/SiC composites were fabricated by a polymer infiltration and pyrolysis process using 2.5D SiC fiber preforms. In the first slurry infiltration process, active Al and inert SiC filler were introduced to enhance the infiltration efficiency. The effects of Al filler addition and thickness of PyC as interphase on mechanical properties of the composites were characterized. The mechanical properties of the composite with active Al as the filler are remarkably improved. The bending strength and proportional limit stress reach 441MPa and 380MPa, respectively. In the range of 200--500nm, the effect of PyC thickness on the bending strength is not noticeable. The elastic modulus of the composite slightly decreases with the increase of PyC thickness.

Key words: SiCf/SiC composite, reactive filler, polymer infiltration and pyrolysis, mechanical properties

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