稀释剂对原位合成TiC_p/钢基硬质涂层组织和性能的影响  

The effect of diluent addition on microstructure and properties of steel matrix hard coatings reinforced by in-situ synthesis TiC particles

作　　者：程军[1,2] 高克玮[1] 郭志猛[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《粉末冶金工业》2016年第2期31-37,共7页Powder Metallurgy Industry

基　　金：广东省战略性新兴产业核心技术攻关资助项目(2011A091102002)

摘　　要：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 micro-hardness of the steel matrix hard coating, TiC parti- cles reinforced steel matrix hard coating was prepared by in-situ synthesis on the casting surface, and the V-EPC ＆ the SHS reaction were used. The effects of diluents addition on the microstructure and mechanical properties of the steel matrix hard coatings were studied with X-ray, OM, SEM, EDS and hardness tester. The results show that metallurgical bond forms between the hard coatings and the steel matrix. The hard coating is composed of TiC par- titles and ct-Fe matrix. With the increase of TiC addition, the combustion reaction temperature decreases; the coat- ing density improves; the TiC particles are ball or ball-like shape and are evenly distributed in the matrix; and the volume fraction of TiC particles and micro-hardness of the hard coating is increased significantly. The comprehen- sive properties of the coating are the best with 10% （mass percent） TiC addition.

关 键 词：原位合成 TIC 自蔓延高温合成 表面复合材料 真空消失模铸造 

分 类 号：TG174.4[金属学及工艺—金属表面处理]