爆炸喷涂CoNiCrAlY-Al_2O_3涂层的组织及高温耐磨性研究  

Microstructure and high temperature wear resistance of detonation spraying CoNiCrAlY-Al_2O_3 coatings

作　　者：常代展[1] 杨王玥[1] 张来启[2] 颜永根[3] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京科技大学新金属材料国家重点实验室,北京100083 [3]北京宝山钢铁股份有限公司,上海201900

出　　处：《材料热处理学报》2006年第1期75-78,共4页Transactions of Materials and Heat Treatment

摘　　要：采用三种爆炸喷涂工艺在SCH19耐热钢基体上制备CoNiCrAlYAl2O3高温耐磨涂层,借助XRD、SEM和EDS等技术对涂层的组织结构进行分析,并检测涂层的表面粗糙度、显微硬度和高温磨损失重。结果表明,涂层由γNi(Co,Cr)、γ′Ni3Al和αAl2O3组成,涂层呈典型的层状结构,适当提高乙炔氧气流量比,可改善涂层的组织结构,并且使其在900℃的高温下具有更优异的耐磨性能。Different processes of detonation spraying were used to deposit CoNiCrAlY-Al_2O_3 coatings on the SCH19 heat resistant steel. The microstructure of the coatings was characterized by means of XRD, SEM and EDS. The surface roughness, microhardness and high temperature wear loss were measured. The results show that CoNiCrAlY-Al_2O_3 coatings take lamellar structures as characteristics and are composed of γ-Ni(Co,Cr)、γ′-Ni_3Al and α-Al_2O_3. Properly increasing C_2H_2/O_2 flow ratio leads to more homogeneous microstructure and improves the high temperature wear resistance at 900℃.

关 键 词：爆炸喷涂 CoNiCrAlY-Al2O3涂层 组织结构 高温磨损 乙炔氧气流量比 

分 类 号：TG174.442[金属学及工艺—金属表面处理] TG113[金属学及工艺—金属学]