【摘要】 碳化硅陶瓷具有优良的性能,广泛应用于各个领域。凝胶注模成型是通过有机单体的聚合反应实现原位固化的成型方法。成型的坯体具有结构均匀、致密度高、强度大等特点。本文采用凝胶注模成型工艺和无压烧结制备了碳化硅陶瓷材料,研究了固含量对无压烧结碳化硅陶瓷微观结构和性能的影响。研究结果表明:随着固含量的增加,碳化硅料浆的粘度值逐渐增加,流动性变差,而制得的碳化硅陶瓷弯曲强度和断裂韧性随固含量的增加而增加。更多还原

【Abstract】 Silicon carbide ceramics have been are widely used in many fields. In this paper,silicon carbide ceramics were prepared by gel-casting,which is a net-shape modeling technology caused by the polymerization of organic monomer(acrylamide),and pressureless sintering. It was shown that the green bodies molded by gel-casting have uniform structure,high density,high flexural strength and machinability. The effect of the solid phase content of the slurry in the microstructure of the sintered silicon carbide was also examined. The result showed that the flexural strength and the fracture toughness improves with the increase of the solid phase content.更多还原