(北京有色金屬研究總院，北京100088)
摘 要: 用X射線衍射儀、掃描電鏡、摩擦磨損試驗等，研究了粉末冶金“金屬布’，及其鋼表面改性技術(shù)在鋼表面制備的WC-Ni系合金復合涂層的微觀組織和性能。結(jié)果表明:該合金涂層中硬質(zhì)相的體積含量可大于60%；涂層的微觀組織有兩類：一種是在粘結(jié)相中均勻分布的碳化物與彌散分布的球狀粘結(jié)相富集區(qū)構(gòu)成的非均勻結(jié)構(gòu)；另一種是碳化物和粘結(jié)相都均勻分布的均勻結(jié)構(gòu)。碳化物分布區(qū)的硬度大于Hv1076，粘結(jié)相富集區(qū)的硬度在Hv967~Hv458之間。涂層與鋼基體之間有幾~幾十微米的界面過渡區(qū)，形成剪切結(jié)合強度大于400 MPa的冶金結(jié)合。復合涂層的耐磨性明顯優(yōu)于調(diào)質(zhì)T8工具鋼。
關(guān)鍵字: 復合涂層 微觀組織 性能
（General Research Institute for Non-ferrous Metals，Bei jing 100088）
Abstract:The microstructure and properties of WC-Ni alloy composite coating manufactured by 0Powdered Alloy Sheet" and corresponding steel surface hardening technology were studied by XRD, SEM，wear-resistance or abrasion resistance test etc. It is found that the volume percentage of hard phase can be more than 60% in the cladding material. Two type microstructures exist in the surface coating:one is that tungsten carbides homoge-neously distributed in nickel alloy binder mix with dispersal spherical binder-rich zone to form unhomogeneous mi-crostructure;the other is that both carbide and binder are mixed homogeneously to form homogeneous microstruc-
ture. The hardness for carbide distribution zone is more than Hv 1076; while for binder-rich zone the hardness is between Hv 458~Hv 967. There is an interface region between surface alloy layer and steel matrix to form metal-lurgical combination. The shear bonding strength is over 400 MPa. The wear resistance of coating is obviously higher than quenching-tempering T8 tool steel(HRC55).
Key words: microstructure propertiies powdered alloy sheet WC-Ni alloy composite coating
