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为提高钢基硬质涂层的表面质量和显微硬度,采用真空消失模铸造法引发自蔓延高温合成(SHS)反应,在铸件表面制备原位合成TiC颗粒增强钢基硬质涂层。通过X-ray、OM、SEM、EDS及显微硬度测试等方法,研究了稀释剂TiC的加入量对钢基硬质涂层微观组织和力学性能的影响。结果表明:硬质涂层与基材之间呈冶金结合,涂层组织由TiC颗粒和α-Fe基体相构成;随外加TiC含量的增加,可降低燃烧反应温度,提高涂层组织致密度,原位合成的TiC颗粒细小呈圆球或近圆球形状,均匀分布在基体组织中,显著提高了TiC颗粒总体积分数和硬质涂层显微硬度,其中TiC加入量为10%(质量分数)时,涂层的综合性能最佳。
In order to improve the surface quality and microhardness of the steel-based hard coating, self-propagating high temperature synthesis (SHS) reaction was initiated by vacuum lost foam casting to prepare in-situ synthesized TiC particles reinforced steel-based hard coatings on the surface of the castings. The effects of TiC addition amount on the microstructure and mechanical properties of the steel-based hard coatings were studied by X-ray, OM, SEM, EDS and microhardness test. The results show that the hard coating is metallurgically bonded with the substrate, the microstructure of the coating is composed of TiC particles and α-Fe matrix. With the increase of TiC content, the combustion reaction temperature can be decreased and the density of the coating can be increased. TiC particles synthesized in-situ were finely spherical or nearly spherical shape and uniformly distributed in the matrix. The TiC particles significantly increased the total volume fraction of TiC particles and the microhardness of the hard coating. TiC content was 10% (mass fraction ), The overall performance of the coating is the best.