摘要
研究了活性填料钨（Ｗ）在聚碳硅烷（ＰＣＳ）先驱体转化陶瓷中的应用。研究表明，Ｗ能有效降低陶瓷素坯的气孔率。Ｗ可与ＰＣＳ气态裂解产物、游离碳和Ｎ_２气氛反应生成新的化合物，提高ＰＣＳ的陶瓷产率。Ｗ还能提高烧成体的强度。当■（Ｗ）＝１５％时，烧成体的三点弯曲强度为 １０１ ＭＰａ，为不含活性填料的陶瓷烧成体的１．５倍。但是在先驱体中引入Ｗ不能抑制坯体在裂解过程中的收缩。Ｗ含量越高，陶瓷烧成体的线收缩越大。
The application of tungsten (W)in polycarbosilane (PCS)derived ceramics was investigated. The results showed that W could decrease efficiently the porosity of the green compact. W could react with gas volatile of PCS during pyrolysis, free carbon and N, to produce new compounds,which increased ceramic yield of PCS. W enhanced the three-point bending strength of the resulted ceramic with a strength of 101 MPa when the volume ration of 9(W) was 15 %,which was 1. 5 times of that of where W was excluded. However,W couldn't restrain the linear shrinkage of the green compact during pyrolysis. The linear shrinkage was higher with increasing the volume ration of (W).
出处
《特种铸造及有色合金》
EI
CAS
CSCD
北大核心
2000年第1期1-3,共3页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金!59682009
