低分子量聚碳硅烷制备3D-C<sub>f</sub>/SiC复合材料

邹世钦; 张长瑞; 周新贵; 曹英斌

低分子量聚碳硅烷制备3D-C_f/SiC复合材料

长沙国防科技大学航天与材料工程学院, CFC重点实验室,长沙 410073

基金项目: "863"基金资助 ( 2002AA305102);国防预研基金资助 ( 41312011002)

详细信息

通讯作者:
邹世钦,博士生,主要从事陶瓷基复合材料的研究 E-mail: zoushiqin@sohu.com

中图分类号: TB 323;TB 332
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出版历程
- 收稿日期: 2004-10-07
- 修回日期: 2004-12-26
- 刊出日期: 2005-10-14

PREPARATION OF 3D-C_f/SiC COMPOSITE WITH LOW-MOLECULAR POLYCARBOSILANE

Key Laboratory of National Defence Technology, College of Aerospace and Materials Engineering, National University of Defence Technology, Changsha 410073,China

More Information

Corresponding author:
ZOU Shiqin

摘要

摘要: 研究了低分子量聚碳硅烷 (PCS) 通过先驱体浸渍裂解 (PIP) 工艺制备C_f/SiC复合材料。分析表明:PCS的数均分子量为400,活性较强,陶瓷化产率为70％左右,在1200℃基本转化为微晶态的β-SiC。分别通过3种不同升温速率制备了3D-C_f/SiC复合材料试样,其弯曲强度分别为745.2MPa、686.7MPa和762.5MPa,明显高于文献报道3D-C_f/SiC复合材料弯曲强度300~500MPa的水平。试样断口的SEM照片均显示长的纤维拔出,有良好的增韧效果,低分子量PCS裂解得到的基体比较致密。实验结果说明,低分子量PCS适合于制备3D-C_f/SiC复合材料,并且提高升温裂解速率对材料性能影响很小。
- 低分子量聚碳硅烷 /
- 先驱体浸渍-裂解工艺 /
- C_f/SiC复合材料
Abstract: 3D-C_f/SiC composites were prepared with low-molecular polycarbosilane (PCS) using a precursor infiltration pyrolysis (PIP) process.The average molecular weight of active PCS is 400 (M_n) . The ceramic yield is approximately 70%, and PCS was translated into β-SiC crystal at 1200℃. The samples of 3D-C_f/SiC composites were prepared at three different heating rates.Bending strengthes were respectively 745.2MPa,686.7MPa,and 762.5MPa.SEM photographs of sample fracture surfaces indicate that in the micro-structures there are long fibers pulled out,and the fracture toughness is high.The matrix is close-grained.The research indicates that 3D-C_f/SiC composites with low-molecular polycarbosilane have good mechanical performance,and the low-molecular PCS fits the preparation of 3D-C_f/SiC composites by PIP process.
- low-molecular polycarbosilane ( PCS) /
- precursor infiltration pyrolysis ( PIP) /
- C_f/SiC composites