(中南工业大学粉末冶金国家重点室验室， 长沙 410083)
摘 要: 研究了碳纤维前驱体即预氧丝在氧化镁/炭复合材料中原位碳化及其强化作用。在氧化镁/炭复合材料中存在铝、镁添加剂时，预氧丝原位碳化后具有碳纤维的强度和强化效果。预氧丝在添加硅粉的氧化镁/炭材料中原位碳化时因与硅反应失去强度， 在无抗氧化添加物的氧化镁/炭材料中原位碳化后，预氧丝因氧化失去强度，对基体无强化作用。
关键字: 碳复合材料 耐火材料 碳纤维 碳化 纤维强化
（）
Abstract:The in-situ carbonization and reinforcing effect of carbon fiber precursor in MgO-C composite were investigated. The precursor, after in-situ carbonizing in MgO-C composite containing Al and Mg powders, has the same strength and reinforcing effect as the carbon fiber. The precursor carbonized in MgO-C composite containing silicon powder has very low strength, because of the reaction between the precursor and silicon. Carbonized in MgO-C composite without any addition, the precursor has so low strength that it has not positive effect on the strength of the composite.
Key words: carbon matrix composite refractory carbon fiber carbonization fiber reinforcement
