原位合成WC_p/W丝增强铁基复合材料的组织与性能

Microstructure and properties of in-situ synthesized WC_p/W wires reinforced iron matrix composites

在1 100℃和1 150℃下,钨丝和灰口铸铁中的石墨相原位合成WC颗粒,该颗粒与未反应的钨丝协同增强灰口铸铁,得到铁基复合材料。通过SEM、XRD、EDS、微观硬度和干式销盘磨损测试等手段,对复合试样进行组织形貌观察及性能测试。结果表明,在1 150℃时,原位合成的WC颗粒较大,其复合材料在小的载荷下耐磨性较好;而在1 100℃时,原位合成的WC颗粒细小,其复合材料在大的载荷下耐磨性较好。合成反应的机理受到反应物的扩散速度的影响。

The grey east iron matrix composites,in which the reinforcement phases were in-situ synthesized WC particles between tungsten wires and graphite phases from matrix, as well as the residual tungsten wires, were fabricated at 1 150 ℃ and 1 100 ℃, respectively. The morphologies and properties of the composites were investigated by means of SEM, XRD, EDS, micro-hardness and pin-on-disc wear test in dry air. The results show that in-situ WC particles at 1 150 ~C has big size, by which composite reinforced has better wear resistance under the lower load,however,in-situ WC particles at 1 100 ℃ are fine, by which composite reinforced has better wear-resistance under the higher load. Both of the two in-situ WC mechanisms are affected by the diffusion rate of reactants.