预氧丝在氧化镁/炭复合材料中的原位碳化及其强化作用

IN SITU CARBONIZATION AND REINFORCING EFFECT OF CARBON FIBER PRECURSOR IN MgO C COMPOSITE

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。

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.