原位合成WC颗粒与钨丝混杂增强铁基复合材料

Iron matrix composite reinforced by hybrid of in-situ WC particles and tungsten wires

通过对钨丝和灰口铸铁熔体组成的体系施加一定的电磁场,促使钨丝与熔体中的碳原子进行反应,原位生成WC颗粒。利用SEM、EDS和XRD对复合材料的显微组织进行研究。结果表明:在电磁场频率为4kHz,电流为15A时,原位合成的WC颗粒均匀地分散在钨丝周围,WC颗粒与未反应的钨丝共同组成混杂增强铁基复合材料。两体磨损试验结果表明:与对比试样相比,混杂增强铁基复合材料的耐磨性提高约2.5倍,这可归因于原位合成的WC颗粒硬度较高且弥散分布在基体中。

The in-situ synthesis of WC particles through reaction between tungsten wires and carbon atoms was observed by exerting an electromagnetic field to the system consisting of tungsten wires and melt of gray cast iron.The microstructures of the composites were studied by means of SEM,EDS and XRD.The results show that when the frequency of the electromagnetic field is 4 kHz and the current is 15 A,the WC particles are in-situ synthesized and distribute around the residual tungsten wires.Iron matrix composites reinforced hybridly by in-situ WC particles and the residual tungsten wires are obtained.The results of two-body abrasive test shows that the wear resistance of the hybrid reinforced iron matrix composite is 2.5 times higher than that of the reference sample,this is attributed to the higher hardness of in-situ WC particles and their dispersive distribution in the matrix.