以聚硅碳硅烷和乙酰丙酮铝为原料, 在反应装置的裂解柱中加入填料,在常压下合成了聚铝碳硅烷. 结果表明: 添加填料使合成聚铝碳硅烷的时间缩短46%,聚铝碳硅烷的 从1008增大到2436, 分子量的分布变窄, ---Si---Si---键的含量低;在N2气氛中, 在400℃以下失重减少, 在1200℃陶瓷的产率从65%提高到69%;加入填料可促进---Si---Si---链转化为---Si---C---Si---链, 制备出的聚铝碳硅烷纤维在预氧化过程中氧的增重少,预氧化烧成后得到的Si--Al--C--O连续纤维强度为2.1 GPa,在Ar中1800℃烧结可得到致密的SiC(Al)纤维. 纤维的结晶行为与不加填料时的类似.
Polyaluminocarbosilane(PACS) was synthesized by a reaction between polysilacarbosilane and aluminum acetylacetonate at ambient pressure in N2. A reactor with a high temperature pyrolysis equipment which was filled with fillings was used, so PACS can be prepared for shorter reaction time. Comparing with the PACS synthesized without fillings, its Mn increased from 1008 to 2436, its molecular distribution was narrower, and its –Si–Si– bonds content decreased. Moreover, ceramic yield of the obtained PACS at 1200℃ in N2 was increased from 65% to 69% when it was synthesized with fillings. It is suggested that the translation from –Si–Si– bonds to –Si–C– bonds was facilitated when the filling existed. The PACS is spinnability. Lower mass was gotten during air curing process. The tensile strength of the obtained Si–Al–C–O fiber is 2.1 GPa. A densified SiC(Al) fiber was obtained after been heated at 1800 ℃ in Ar.
参考文献
| [1] | |
| [2] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%