反应超音速火焰喷涂TiC-TiB_2-Ni涂层的组织性能  

Microstructure and property of reactive high velocity oxygen fuel spraying TiC-TiB_2-Ni coatings

作　　者：李方坡[1] 王引真[2] 孙永兴[2] 潘蛟亮[2] 高海军[2] 

机构地区：[1]中国石油天然气集团公司管材研究所,陕西西安710065 [2]中国石油大学机电工程学院,山东东营257061

出　　处：《中国石油大学学报（自然科学版）》2009年第1期99-102,108,共5页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：山东省优秀中青年科学家奖励基金(02BS048);东营市科学技术发展计划基金(2005126)

摘　　要：基于反应超音速火焰喷涂技术,以钛粉、炭化硼、石墨和镍粉为原材料,在45#钢基体上制备3种TiC-TiB2-Ni涂层,并对涂层组织与相关性能进行研究。结果表明:Ti-B4C-C-Ni粉末组元在喷涂过程中发生剧烈的放热反应,可以合成TiC-TiB2-Ni金属陶瓷涂层,Ti-B4C之间发生反应的趋势和剧烈程度明显大于Ti-C之间的;涂层中除主要组成相TiC,TiB2和Ni外,还含有一定量的Ti(C,N),TiO2,Ti2O3和NiO相;随着TiB2含量的减少,涂层中的气孔和夹杂物含量增多,显微硬度和结合强度逐渐降低,滑动磨损量明显升高,涂层耐磨性能下降;利用Ti-B4C-Ni材料组元制备的TiC-TiB2-Ni涂层的性能最优,涂层的滑动磨损失效形式主要表现为脆性剥落和犁削。Three kinds of TiC-TiB2-Ni coatings were sprayed on the steel substrate with reactive high velocity oxygen fuel （HVOF） spraying technique and Ti-B4C-C-Ni reactive system. Microstructure and properties of TiC-TiB2-Ni coatings were researched. The results reveal that TiC-TiB2-Ni ceramic coatings can be successfully prepared with Ti-B4C-C-Ni reactive system. The reaction of Ti-B4C system is more likely to occur than that of Ti-C system. TiC-TiB2-Ni coatings are composed of the major phases of TiC, TiB2, Ni, some phases of Ti （C, N）, TiO2, Ti2O3 and NiO. Their microhardness, binding strength and wear resistance decrease with TiB2 content decreasing. The introduction of TiB2 ceramic phase can significantly improve coatings＇ mechanical properties. The coating sprayed with Ti-B4C-Ni reactive system has the highest binding strength, microhardness and the best wear resistance in all. Furthermore, its wear mechanism is characterized by spalling and ploughing.

关 键 词：反应热喷涂 超音速火焰喷涂 TiC—TiB2-Ni 复合涂层 摩擦磨损 

分 类 号：TG174.442[金属学及工艺—金属表面处理]