激光熔覆Al_2O_3-NiCrAl层的脆性及摩擦磨损特性  

Brittleness and Tribological Characteristics of Al_2O_3, Ceramic Coatings Cladded by Laser on Wl8Cr4V Steel

作　　者：陈传忠[1] 王文中[2] 曹怀华[1] 孙毅[1] 于家洪 雷廷权[3] 

机构地区：[1]山东工业大学材料科学与工程学院,济南250061 [2]青岛市职工大学,青岛266021 [3]哈尔滨工业大学,哈尔滨150001

出　　处：《中国激光》1999年第9期841-846,共6页Chinese Journal of Lasers

基　　金：山东省教委资助

摘　　要：利用SEM，TEM，EDAX，声发射及磨损试验等方法研究了激光熔覆Al2O3-NiCrAl复合陶瓷层的组织结构、脆性及其干滑动摩擦磨损特性。结果表明：Al2O3激光馆覆层由α-Al2O3往状晶及往晶间少量的Ni2Al18O29相组成，熔覆层硬度达2351～2667Hv0.2，熔覆层的脆性与等离子喷涂层相比有所增大；其耐磨性能为等离子喷涂层的2倍左右，在滑动摩擦条件下熔覆展的磨损机制是脆性剥落和磨料磨损。The structure, brittleness and dry sliding tribological characteristics of laser-cladded Al2O3 ceramic coatings on W18Cr4V steel have been studied by means of SEM,TEM, EDAX, sound emission and wear tests techniques etc. The results show that theAl2Os coating cladded by laser consists of columnar grains of a- Al2O3and a small amount ofNi2Al18O29among Al2O3 grains. The hardness value of Al2O3 coatingn cladded by laser isabout 2351 ~ 2667Hvo. 2. The britlleness of the laser-cladded Al2O3 coatings is increased tosome extent than that of a plasma-sprayed Al2O3 coating. In dry sliding wear condition thewear resistance of the Al2O3 coatings is about 2 times that of the plasma- sprayedAl2O3 coating, and the laser-cladded Al2O3 coatings are worn by brittle peeling and abrasivewear.

关 键 词：AL2O3陶瓷 激光熔覆 组织结构 摩擦磨损特性 

分 类 号：TG156.99[金属学及工艺—热处理] TQ174.758[金属学及工艺—金属学]