表面技术Issue(5)：62-66,5.DOI:10.16490/j.cnki.issn.1001-3660.2015.05.012
等离子喷涂NiCoCrAlY/Al2 O3涂层的制备及摩擦性能研究
Study on Preparation and Tribological Properties of Atmospheric Plasma-sprayed NiCoCrAlY/Al2 O3 Wear-resistant Coatings
摘要
Abstract
ABSTRACT:Objective To prepare the atmospheric plasma-sprayed NiCoCrAlY/Al2 O3 wear-resistant coatings and study the tribo-logical properties and tribological mechanism of the coating. Methods The NiCoCrAlY/Al2 O3 composite powder was prepared by the technology of spray granulation, chemical and metallurgical coating and solid state alloying. The NiCoCrAlY/Al2 O3 composite coating was prepared by atmospheric plasma-spray technology using the prepared powder on the surface of 45# steel. The micro-structure and phase composition of the powder and coating were studied by SEM and XED. The tribological properties and tribologi-cal mechanism of the APS sprayed NiCoCrAlY/Al2 O3 composite coatings were investigated. Results The surface of Al2 O3 particles was evenly coated with NiCoCrAlY alloy and the thickness of NiCoCrAlY alloy was 3~5 μm. The composite coatings consisted of elongated lamellae and they integrated with each other very well. The phase compositions of composite powder were NiCrAl and Al2 O3 . The friction coefficient of the coating decreased with the increase of temperature. The friction coefficient of the coating was 0. 64 at room temperature and decreased to below 0. 4 at 800 ℃, which was due to the formation of metallic oxide. The wear rate of the coating first increased and then decreased with the increase of temperature. The abrasive mechanism of the NiCoCrAlY/Al2 O3 composite coatings was dominated by mixed brittle crack and abrasive at low temperature, and it was characterized by oxida-tion, abrasive, plastic deformation and as well as coating transfer to the coupled pin at high temperature. Conclusion The atmos-pheric plasma-sprayed NiCoCrAlY/Al2 O3 composite coating exhibited excellent wear-resistant performance by high temperature self-lubrication.关键词
NiCoCrAlY/Al2 O3/复合涂层/等离子喷涂/摩擦性能Key words
NiCoCrAlY/Al2 O3/composite coating/plasma spraying/tribological property分类
矿业与冶金引用本文复制引用
曹玉霞,杜令忠,张伟刚,兰叶,黄传兵..等离子喷涂NiCoCrAlY/Al2 O3涂层的制备及摩擦性能研究[J].表面技术,2015,(5):62-66,5.基金项目
国家自然科学基金项目(51471159) （51471159）
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 Natural Science Foundation of China (51471159),Science and Technology Plans of Tangshan (14130286a) and Key Disci-plines of Materials Science and Engineering of Tangshan College(TSC2013003) （TSC2013003）
