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聚硅氧烷先驱体转化制备三维Cf/Si-O-C复合材料的研究
引用本文:马青松,陈朝辉,郑文伟,胡海峰.聚硅氧烷先驱体转化制备三维Cf/Si-O-C复合材料的研究[J].复合材料学报,2003,20(2):53-57.
作者姓名:马青松  陈朝辉  郑文伟  胡海峰
作者单位:国防科技大学,航天与材料工程学院新型陶瓷纤维及其复合材料国防科技重点实验室,长沙,410073
摘    要:研究了含氢聚硅氧烷(PSO)与二乙烯基苯(DVB)的交联与裂解。结果表明:只有在氯铂酸的催化作用下,PSO与DVB才能完全交联。DVB/PSO质量比对陶瓷产率的影响较大,DVB/PSO=0.5时陶瓷产率最高,达到76%。裂解产物中Si,C,O的含量分别为38.3wt%,34.3wt%,27.4wt%。以质量比为0.5的DVB/PSO体系为先驱体,采用先驱体转化法制备出三维Cf/Si-O-C复合材料。研究发现:第一次裂解时采用热压辅助可以明显提高材料的力学性能。第一次在1600℃,10MPa的条件下热压裂解5min,后续真空浸渍-常压裂解处理六个周期所制得的材料具有较高的力学性能,其弯曲强度和断裂韧性分别为502MPa,23.7MPa·m 1/2。理想的界面结合状态是其具有高性能的主要原因。

关 键 词:Si-O-C陶瓷  聚硅氧烷  交联  裂解  先驱体转化  微观结构  陶瓷基复合材料
文章编号:1000-3851(2003)02-0053-05
收稿时间:2001-09-20
修稿时间:2001年9月20日

FABRICATION AND MECHANICAL PROPERTIES OF THREE-DIMENSIONAL CARBON FIBER REINFORCED Si-O-C COMPOSITES USING POLYSILOXANE AS PRECURSOR
MA Qingsong,CHEN Zhaohui,ZHENG Wenwei,HU Haifeng.FABRICATION AND MECHANICAL PROPERTIES OF THREE-DIMENSIONAL CARBON FIBER REINFORCED Si-O-C COMPOSITES USING POLYSILOXANE AS PRECURSOR[J].Acta Materiae Compositae Sinica,2003,20(2):53-57.
Authors:MA Qingsong  CHEN Zhaohui  ZHENG Wenwei  HU Haifeng
Affiliation:Key Laboratory of Novel Ceramic Fibers &|Composites, National University of Defense Technology,Changsha 410073
Abstract:The cross-linking and pyrolysis of hydrogen-containing polysiloxane(PSO) and divinylbenzene(DVB) were investigated in this paper. It was found that only catalyzed with H2PtCl6 could DVB/PSO cure completely. The mass ratio of DVB/PSO had a great effect on ceramic yield. The ceramic yield was the highest of 76 % when the mass ratio of DVB/PSO was 0.5. The content of Si, O, C in the product pyrolyzed at 1000 ℃ was 38.3 wt%, 27.4 wt%, and 34.3 wt%, respectively. Three-dimensional carbon fiber reinforced silicon oxycarbide composites (3D-B Cf/Si-O-C) were fabricated via precursor infiltration and pyrolysis using DVB/PSO as a precursor. The results indicated that the mechanical properties of 3D-B Cf/Si-O-C could be increased markedly if the first pyrolysis cycle was assisted by hot-pressing. The flexural strength and the fracture toughness of the composite, which was hot-pressed at 1600 ℃ for 5 min with a pressure of 10 MPa in the first pyrolysis cycle and treated subsequently with six cycles of vacuum infiltration and pyrolysis with a pressure of 1 atm, were 502 MPa and 23.7 MPa·m1/2, respectively. The high properties were mainly attributed to the ideal interface microstructures.
Keywords:silicon oxycarbide  polysiloxane  cross-linking  pyrolysis  precursor infiltration and pyrolysis  microstructure  ceramic matrix composite
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