短切碳纤维增强碳化硅复合材料的氧化性能研究  

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

作　　者：唐汉玲[1] 曾燮榕[2] 熊信柏[2] 李龙[2] 邹继兆[2] 

机构地区：[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

出　　处：《无机材料学报》2009年第2期305-309,共5页Journal of Inorganic Materials

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.Short carbon fiber reinforced SiC （Csf/SiC） composite was prepared by hot-pressing method. XRD, SEM and isothermal oxidation test were used composite. The results show that the oxidation weight to study the isothermal oxidation property of Csf/SiC 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.

关 键 词：Csf/SiC复合材料 等温氧化 抗氧化性能 

分 类 号：TB331[一般工业技术—材料科学与工程]