W18Cr4V钢表面激光熔覆Al_2O_3陶瓷涂层的组织结构  

STRUCTURE OF LASER CLADDING Al_2O_3 CERAMIC COATINGS ON W18Cr4V STEEL

作　　者：陈传忠[1] 于慧君[1] 侯勇 于家洪[1] 雷廷权[2] 

机构地区：[1]山东工业大学,济南250061 [2]哈尔滨工业大学

出　　处：《陶瓷学报》1998年第1期12-16,共5页Journal of Ceramics

摘　　要：研究了W18Cr4V钢表面Al_2O_3／NicCrAl复合陶瓷涂层的组织结构、成分分布及界面组织特征。结果表明：Al_2O_3／NiCrAl复合陶瓷等离子喷涂层的组织呈层片状，面层由α-Al_2O_3和少量的γ-Al_2O_3组成，层间为机械结合界面．界面处成分变化梯度较大。经激光重熔后的面层组织为单一的α-Al_2O_3柱状晶，Al_2O_3与中间合金NiCrAl间存在明显的界面反应．且界面相增多，在NiCrAl与基体间亦有新相形成；其界面均为冶金结合，层间存在着平缓的成分过渡，中间合金起到了缓解应力和避免涂层开裂的作用。The structure, characteristics of composition distribution and interface structure of Al_2O_3/NiCrAl composite ce-ramic coatings on W18Cr4V steel is studied. The results show that structure of Al_2O_3/NiCrAl composite ceramic lay-er sprayed by plasma is lamellar in shape, the face layer consists of α - Al_2O_3 and γ - Al_2O_3. There are a mechanical combination interface and a very large composition gradient between Al_2O_3 and NiCrAl, and between NiCrAl and ma-trix. There is a unitary α - Al_2O_3 columnar crystal in the face coatings cladded by laser. There is a obvious interface reaction between Al_2O_3 and NiCrAl, and the interface phase becomes more after cladded by laser. A new interface phase appears in the boundary between NiCrAl and matrix also. There is a metallurgical combination interface and a little composition gradient between Al_2O_3 and NiCrAl and between NiCrAl and matrix. The mediate alloy NiCrAl acts as a role of releasing stress and preventing coating from cracking.

关 键 词：激光熔覆 陶瓷 高速钢 氧化铝陶瓷 结构 涂层 

分 类 号：TG174.453[金属学及工艺—金属表面处理] TG154.5[金属学及工艺—金属学]