真空液相烧结法制备三元硼化物硬质合金覆层材料

采用液相烧结法在钢基体表面制备三元硼化物硬质合金覆层,将三元硼化物硬质合金的优异性能赋予钢基体表面,获得了耐磨抗蚀、界面结合强度高的新型硬质覆层材料。同时确定了硬质合金覆层的化学配比(B、Fe、Mo元素成分的配比)和C、Cr、Ni合金元素的添加量。对硬质合金覆层的洛氏硬度的测量结果表明,覆层的硬度明显高于钢基体的硬度,其中5Cr2Ni0.8C材料试样的硬度最大;对硬质合金覆层以及覆层与钢基体的界面结合处的扫描电镜观察和能谱分析表明,铬加入后部分进入陶瓷硬质相,加强了其硬度,而镍元素只在铁基粘结相中存在,并且覆层与钢基体之间形成了致密的冶金结合。

Manufacturing Ternary Boride Carbide Alloy Clad Material with Liquid Sintering Technology

A ternary boride carbide alloy is clad on the steel substrate to form a new type of clad material with excellent wear and corrosion resistance by means of the liquid phase sintering technique.The basic chemical radio(the ratio of B,Fe and Mo) and the contents of alloy elements C,Cr and Ni in cladding are determined.The HRC of the carbide alloy is measured,the result shows that the cladding material is harder than the steel substrate and the material sample of 5Cr2Ni0.8C is the hardest.The microstructure of carbide alloy coat and the vicinity of the bonding interface are investigated with SEM and analysed with EDS.It shows that Cr can be a part of ceramic hard phase and is favourable for the improvement of the hardness while Ni is only a part of steel substrate.In the vicinity of the bonding interface,there exists a transitional zone which becomes a firm metallurgical bonding between cladding and steel substrate.