Microstructure,formation mechanism and properties of plasma-sprayed Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)coatings  

等离子喷涂Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)涂层的显微组织、形成机制和性能

作　　者：Yu-duo MA Pei-wen RU Lei WANG Yong YANG Peng-yue GAO Yan-wei WANG Yu-hang CUI Wen-wei SUN Xing-yu WANG Liang WANG 马玉夺;茹沛文;王磊;杨勇;高鹏悦;王彦伟;崔宇航;孙文韦;王星宇;王亮(河北工业大学天津市材料层状复合与界面控制技术重点实验室,电工装备可靠性与智能化国家重点实验室,材料科学与工程学院,河北省新型功能材料重点实验室,天津300401;中国科学院上海硅酸盐研究所集成计算材料研究中心,上海201899)

机构地区：[1]Key Laboratory for New Type of Functional Materials in Hebei Province,School of Materials Science and Engineering,State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology,Hebei University of Technology,Tianjin 300401,China [2]Integrated Computational Materials Research Centre,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China

出　　处：《Transactions of Nonferrous Metals Society of China》2022年第11期3635-3649,共15页中国有色金属学报（英文版）

基　　金：the National Natural Science Foundation of China(No.52072110);the Natural Science Foundation of Hebei Province,China(No.E2018202034).

摘　　要：The Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)composite coatings were prepared by plasma spraying Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)and Al−Cr2O3−SiC composite powders,respectively.The microstructure,formation mechanism and properties of the two Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)composite coatings obtained by plasma spraying were investigated,and the reaction mechanism of the Al−Cr_(2)O_(3)−SiC system was explored.The results show that the coating obtained by plasma spraying Al−Cr_(2)O_(3)−SiC composite powders had thinner lamella and more tortuous interlayer interface,and the in-situ synthesized Cr_(7)C_(3),CrSi_(2) and Al_(2)O_(3) in the coating were all nano-crystallines.Compared with the Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)coating prepared by plasma spraying Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)composite powders,the plasma-sprayed Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)coating obtained from Al−Cr_(2)O_(3)−SiC composite powders had higher density,higher microhardness(increased by 20%),better fracture toughness and lower wear rate(reduced by 28%).采用等离子喷涂Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)和Al−Cr_(2)O_(3)−SiC复合粉分别制备Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)复合涂层。对比研究等离子喷涂所得两种Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)复合涂层的显微组织、形成机制和性能,并探索Al−Cr_(2)O_(3)−SiC体系的反应机理。结果表明,等离子喷涂Al−Cr_(2)O_(3)−SiC复合粉所得涂层具有更薄的片层、更曲折的层间界面,而且涂层中原位合成的Cr_(7)C_(3)、CrSi_(2)和Al_(2)O_(3)均为纳米晶。与等离子喷涂Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)复合粉制备的Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)涂层相比,等离子喷涂Al−Cr_(2)O_(3)−SiC复合粉所得Cr_(7)C_(3)−CrSi_(2)−Al_(2)O_(3)涂层具有更高的致密度、更高的显微硬度(提高20%)、更好的断裂韧性和更低的磨损率(降低28%)。

关 键 词：plasma spraying in-situ synthesis NANOSTRUCTURE strengthening and toughening wear resistance 

分 类 号：TG174.4[金属学及工艺—金属表面处理]