铝热法制备TiC/TiB2-FeNiCr复合材料

TiC/TiB2-FeNiCr Composite Prepared by Thermite Reaction

摘要:

采用铝热法原位合成出了含TiC颗粒、TiC-TiB2复相陶瓷颗粒增强相体积分数较高的TiC/TiB2-FeNiCr复合材料。利用电子探针分析（EPMA）仪、扫描电镜（SEM）、透射电镜（TEM）和X射线衍射（XRD）仪等手段研究了该复合材料的显微组织和相结构，同时利用显微硬度仪测量了该复合材料的硬度，利用摩擦磨损试验机测量复合材料的耐磨性能。结果表明，TiC/TiB2-FeNiCr复合材料由TiC颗粒、TiC和TiB2复相陶瓷颗粒、针状Cr7C3相，NiAl相和α-FeNiCr合金基体相组成。复合材料的硬度（HV）为13132.5 MPa。复合材料施加载荷20 N，磨损1 h后的失重为4.2 mg；而45#钢在相同条件下的失重量为13 mg，是复合材料的3倍。

Abstract:

TiC/TiB2-FeNiCr composites enhanced by TiC particles and TiC-TiB2 multiphase particles were in-situ synthesized by thermite reaction. The microstructure and phase structure were investigated by electron probe microanalysis (EPMA), scanning electron microscopy (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD). The hardness and wear resistance were tested by the Vickers indentation method and friction-wear testers, respectively. Results show that the TiC/TiB2-FeNiCr composites are composed of TiC, TiC-TiB2 multiphase particles, Cr7C3, NiAl and α-FeNiCr. The Vickers hardness of composites is 13132.5 MPa. The composite mass wear loss is 4.2 mg after wearing for 1 h with 20 N force and that is nearly one third of the mass loss of 0.45C% steel.