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采用铝热法原位合成出了含Ti C颗粒、Ti C-Ti B2复相陶瓷颗粒增强相体积分数较高的Ti C/Ti B2-Fe Ni Cr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,Ti C/Ti B2-Fe Ni Cr复合材料由Ti C颗粒、Ti C和Ti B2复相陶瓷颗粒、针状Cr7C3相,Ni Al相和α-Fe Ni Cr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。
The Ti C / Ti B2-Fe Ni Cr composites with TiC particles and Ti C-Ti B2 multi-phase ceramic particles with higher volume fraction were synthesized in-situ by aluminothermic method. The microstructure and phase structure of the composites were investigated by means of electron probe analysis (EPMA), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) The hardness of the composite was measured and the wear resistance of the composite was measured by friction and wear testing machine. The results show that Ti C / Ti B2-Fe Ni Cr composites consist of TiC particles, TiC and TiB2 multi-phase ceramic particles, acicular Cr7C3 phase, NiAl phase and α-Fe NiCr alloy matrix. The hardness of composites (HV) is 13132.5 MPa. The composite had a load of 20 N and a weight loss of 4.2 mg after 1 h of wear. The weight loss of 45 # steel under the same conditions was 13 mg, which was three times of that of the composite.