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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

短切碳纤维增强碳化硅复合材料的氧化性能研究

唐汉玲1, 曾燮榕2， 熊信柏2， 李 龙2， 邹继兆2   

  1. 1.西北工业大学 材料学院, 西安 710072; 2.深圳大学 材料学院, 深圳市特种功能材料重点实验室, 深圳 518060
  • 收稿日期:2008-05-14 修回日期:2008-07-14 出版日期:2009-03-20 网络出版日期:2009-03-20

Research of Oxidation Resistance of Short Carbon Fiber Reinforced SiC Composite by Hotpressing

ANG Han-Ling1, ZENG Xie-Rong2, XIONG Xin-Bo2, LI Long2, ZOU Ji-Zhao2   

  1. 1.School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China; 2. College of Materials Science and Engineering, Shenzhen University, Shenzhen Key Laboratory of Special Functional Materials, Shenzhen 518060, China
  • Received:2008-05-14 Revised:2008-07-14 Published:2009-03-20 Online:2009-03-20

PDF (PC)

1959

被引次数

17 | 4

摘要： 采用热压烧结法制备了致密的短切碳纤维增强碳化硅 (Csf/SiC) 复合材料.借助热重分析、XRD、SEM等手段对该材料等温氧化性能进行了研究.研究结果表明，该复合材料在900℃氧化时失重最为严重；之后，随着氧化温度升高，失重率逐渐减少；在1450℃以上则表现为增重.复合材料在低于900℃氧化时，主要是由于碳纤维氧化造成的失重；在900～1450℃氧化区间，复合材料表面的短切碳纤维被氧化，基体生成保护性的氧化膜，材料内部的短切碳纤维受到基体和氧化膜的有效保护，能够继续发挥增韧作用.因此，Csf/SiC复合材料在此温度范围内具有良好的抗氧化能力；当复合材料在1600℃氧化时，氧化反应剧烈，材料破坏严重，失去了抗氧化能力.

关键词: Csf/SiC复合材料, 等温氧化, 抗氧化性能

Abstract: Short carbon fiber reinforced SiC (Csf/SiC) composite was prepared by hotpressing method. XRD, SEM and isothermal oxidation test were used to study the isothermal oxidation property of Csf/SiC composite. The results show that the oxidation weight loss of the composite is the most at 900℃. The weight loss decreases with the oxidation temperatures rising. Below 900℃, the oxidation weight loss of the composites is caused by the carbon fibers oxidation. Above 1450℃, the composites gain weight. Between 900-1450℃, short carbon fibers on the composite surface are oxidized and the SiC matrix forms a protecting film. The inner short carbon fibers still have the strengthen effect for the oxidation layer and matrix protecting them from oxidation, and the composites have good self-resistance oxidation property. When the composites oxide at 1600℃, the composite surface is destroyed badly and lose the resistance oxidation capacity.

Key words: Csf/SiC composite, isothermal oxidation, resistance oxidation property

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