SiC粒度对KmTBCr-2表面复合材料组织及性能的影响

Influence of SiC Particle Size on Microstructure and Performance of KmTBCr-2 Surface Composite

将复合材料层涂料和耐火涂料依次粘附在可发性聚苯乙烯（EPS）制成的铸件模型上,然后用干砂振动造型、浇注,制备Si C/铁基表面复合材料,并对其金相组织与性能进行研究。结果表明,不同目数Si C颗粒制备的表面材料与基体结合良好。该复合材料的表层含碳量为5.5%~6%,含硅量为1%~1.6%,含铬量为6%~7.5%。随距表层距离的增加,上述元素含量逐渐降低,距表层6 mm左右时,与基体成分接近。制得表面复合材料的耐磨性比基体材料最大提高了约2.57倍。

The composite coating and the refi＇actory adhesion coating were brought in the casting model made of polystyrene （EPS） in turn. By dry sand vibration molding and casting, SiC/iron based surface composite was prepared. The microstructure and properties of the composite were analyzed. The results show that the surface materials prepared with different SiC mesh combine well with matrix. The composite surface contains 5.5%-6% carbon, 1%-1.6% silicon, and 6%- 7.5% chromium. With the increase of distance to the surface, the content of above three elements gradually reduce. About 6 ram to the surface, the composition of coating surface is closed to matrix. The wear resistance of the coating is about 2.57 times higher than that of the substrate material in the largest.