(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。結果表明:該合金涂層中硬質相的體積含量可大于60%；涂層的微觀組織有兩類：一種是在粘結相中均勻分布的碳化物與彌散分布的球狀粘結相富集區(qū)構成的非均勻結構；另一種是碳化物和粘結相都均勻分布的均勻結構。碳化物分布區(qū)的硬度大于Hv1076，粘結相富集區(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)，形成剪切結合強度大于400 MPa的冶金結合。復合涂層的耐磨性明顯優(yōu)于調質T8工具鋼。
關鍵字: 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
