热处理对等离子喷涂Ni基非晶/晶态涂层性能的影响  

Effects of Heat Treatment on Properties of Ni-Based Plasma Sprayed Amorphous/Crystalline Coatings

作　　者：郑振环[1] 李强[1] 薛唤[1] 李偲偲[1] 吴敏生[1] 

机构地区：[1]福州大学材料科学与工程学院,福建福州350002

出　　处：《稀有金属》2007年第5期596-601,共6页Chinese Journal of Rare Metals

基　　金：福建省科技计划重点项目(2003H0242005H031)资助

摘　　要：应用扫描电子显微镜（SEM）、X射线衍射仪（XRD）和差示扫描量热仪（DSC）研究了等离子喷涂NiCrBSi非晶／晶态复合涂层的微观组织及晶化行为，并探讨了热处理对涂层结合强度和显微硬度统计分布的影响。结果表明：喷涂态涂层为典型的层状结构，含有两类不同的层片。涂层中非晶相的晶化过程分两步进行，析晶温度范围分别为497～560℃和590～660℃。在200～400℃热处理1h，涂层与基底结合强度提高，400℃时达最大值47．3±4．7MPa；500～700℃热处理1h，结合强度变差，随温度升高而下降。喷涂态和200～400℃热处理涂层的显微硬度Weibull分布为双模态分布，揭示了层片的双态性；由于非晶相析晶，涂层500～700℃热处理后变为单模态分布。综合分析热处理对结合强度和显微硬度的影响程度表明，500℃热处理1h，涂层的综合性能较优。The microstructure and crystallization of plasma sprayed NiCrBSi amorphous/crystalline composite coating were investigated by SEM, XRD and DSC. The effects of heat treatment on the adhesion strength and microhardness distribution of coatings were discussed. It was found that as-sprayed coatinghad characteristics of typical lamella structure with two types of splats. Crystallization of the amorphous phase fell into two processes occurred in the range of 497 - 560 ℃ and 590 - 660 ℃, respectively. Heat treatment in the range of 200- 400 ℃ for 1 h resulted in improvement of adhesion strength between coating andsubstrate, and the adhesion strength reached maximum of 47.3 _ 4.7 MPa of coating at400 ~C. However, the adhesion strength of coating heat-treated at 500 - 700 ℃ decreased with the increasing temperature. The microhardness distribution of as-sprayed coating and coating heat-treated at 200 - 400 ℃ ex- hibited bimodal Weibull distribution, indicating the bimodal splats in the coating. However, the coating heat-treated at 500- 700 ℃ exhibited unimodal Weibull distribution due to the crystallization of amorphous phase. Considering the effects of heat-treatment on the adhesion and microhardness, the coating heattreated at 500 ℃ for 1 h had optimum comprehensive properties.

关 键 词：等离子喷涂 非晶/晶态复合涂层 热处理 结合强度 显微硬度 

分 类 号：TG174.44[金属学及工艺—金属表面处理]