表面技术Issue(6)：27-31,5.DOI:10.16490/j.cnki.issn.1001-3660.2015.06.006
等离子喷涂NiCr/Cr3 C2-hBN复合涂层的制备及摩擦性能研究
Preparation and Tribological Properties of Atmospheric Plasma-sprayed NiCr/Cr3 C2-hBN Wear-resistant Coatings
摘要
Abstract
Objective To improve the tribological properties of the NiCr/Cr3 C2 composite coatings by adding hBN into the coat-ings as lubrication. Methods The NiCr/Cr3 C2-10%hBN composite powder was prepared by the technology of chemical and metal-lurgical coating, spray granulation and solid state alloying. The coating was prepared by atmospheric plasma-spray technology using the prepared powder. The microstructure, phase composition and tribological properties from room temperature to 800 ℃ of coating were studied by SEM, XED and high-temperature tribometer. The tribonlogical mechanism of the APS sprayed NiCr/Cr3 C2-10%hBN composite coatings were investigated at room temperature, 400 ℃ and 800 ℃. Results The NiCr/Cr3 C2-10%hBN composite coatings consisted of elongated lamellae and the tensile strength of the coating was 24 MPa. The porosity of the coating was (8. 47± 0. 5)%. The friction coefficient and wear rate of the coating firstly increased and then decreased with the increasing of tempera-ture. The friction coefficient and wear rate of the coating were 0. 59 and 9. 2×10-4 mm3/(N·m) at 400 ℃, 0. 45 and 4. 1×10-4 mm3/( N·m) at 800 ℃, respectively, which was due to the formation of hBN lubricant film and metallic oxide at high tempera-ture. The abrasive mechanism of the NiCr/Cr3 C2-10%hBN composite coatings was dominated by brittle crack at room temperature, mixed brittle crack, plastic deformation and mild adhensive wear at 400℃, and it was characterized by plastic deformation, oxida-tion, adhesive wear and as well as coating transfer to the coupled pin at 800 ℃. Conclusion The NiCr/Cr3 C2-10%hBN composite coating exhibited excellent wear-resistant performance at both low and high temperature.关键词
NiCr/Cr3 C2-hBN/复合涂层/等离子喷涂/摩擦性能Key words
NiCr/Cr3C2-hBN/composite coating/plasma spray/tribological property分类
矿业与冶金引用本文复制引用
曹玉霞,黄传兵,杜令忠,张伟刚,兰叶..等离子喷涂NiCr/Cr3 C2-hBN复合涂层的制备及摩擦性能研究[J].表面技术,2015,(6):27-31,5.基金项目
国家自然科学基金项目(51471159) （51471159）
河北省自然科学基金项目(E2015105068) （E2015105068）
唐山市科技计划项目(14130286a) （14130286a）
唐山学院材料科学与工程重点学科(TSC2013003) Fund:Supported by the National Science Foundation of China (51471159) （TSC2013003）
National Science Foundation of Hebei (E2015105068) （E2015105068）
Science and Technology Plans of Tangshan (14130286a) （14130286a）
Key Disciplines of Materials Science and Engineering of Tangshan College(TSC2013003) （TSC2013003）
