TiB2+TiC含量对等离子熔覆Ni55基复合材料涂层显微组织及耐磨性能的影响

来源期刊:中国有色金属学报(英文版)2019年第1期

论文作者:张新杰 崔洪芝 王佳峰 张国松 赵玉桥 孙康

文章页码:132 - 142

关键词:金属基复合材料涂层;等离子熔覆;显微组织;摩擦学行为;磨损机制

Key words:metal matrix composite coating; plasma cladding; microstructure; tribological behavior; wear mechanism

摘    要:采用等离子熔覆工艺,以不同比例的Ti、B4C和Ni55为原料原位制备TiB2-TiC强化Ni55基复合材料涂层,研究陶瓷相TiB2+TiC含量对涂层显微组织及耐磨性能的影响。结果表明:通过等离子熔覆合成TiB2和TiC陶瓷相,陶瓷相含量对涂层在不同载荷下的摩擦学性能和磨损机制有较大影响。在30 N磨损载荷下,复合陶瓷通过阻碍裂纹扩展抑制剥层磨损的作用;在60 N磨损载荷下,高硬度、高强度陶瓷可以有效降低磨粒磨损和黏着磨损的作用。另外,在高陶瓷含量的涂层磨痕表面发现有压实层结构分布,有效降低摩擦因数和磨损率。在30 和60 N的磨损载荷下,TiB2-TiC复合陶瓷通过不同的磨损机制提高涂层的磨损性能。

Abstract: TiB2-TiC reinforced Ni55 matrix composite coatings were in-situ fabricated via plasma cladding on steels using Ti, B4C, and Ni55 as precursor materials at different proportions. Effects of TiB2+TiC content of ceramics phase on the microstructure and wear resistance were studied. The results showed that ceramic phases TiB2 and TiC were in-situ synthesized by plasma cladding, and the ceramic phase content significantly affected tribological performance and the wear mechanism of coatings under different loads. The composite ceramics protected coatings from further delamination wear by crack-resistance under a load of 30 N. Severe abrasive wear and adhesive wear were prevented when the load increased to 60 N because of the high hardness and strength of ceramic phases. Moreover, a compacted layer appeared on the wear surface of coatings with high content of ceramic phases, which effectively decreased the friction coefficient and wear rate. The TiB2-TiC composite ceramics significantly improved the wear performance of metal matrix composite coatings by different mechanisms under loads of 30 and 60 N.

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 技术支持 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(京)字第342号   京ICP备17050991号-6      京公网安备11010802042557号