In-situ formation of layer-like Ag2MoO4 induced by high-temperature oxidation and its effect on the self-lubricating properties of NiCoCrAlYTa/Ag/Mo coatings

• 作者: Enkang Hao Yulong An Jie Chen Xiaoqin Zhao Guoliang Hou Jianmin Chen Meizhen Gao Fengyuan Yan
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（16）
• 页码范围: 164-173
• 页数: 10页
• 语种: 英文

摘要

Ag-Mo-O ternary oxide has attracted growing attention because of its potential as a solid lubricant at high temperatures.This work designs and prepares NiCoCrAlYTa/Ag/Mo composite coating,performed using high velocity oxy-fuel(HVOF)spraying technology.The environment temperature plays an important role in the microstructure and phases as well as lubricant properties of NiCoCrAlYTa/Ag/Mo coatings.When the environment temperature is above 600C,the outer diffusion and oxidation of Ag and Mo lead to the formation of Ag2MoO4 on the coating surface.Layer-like Ag2MoO4 could form a continuous lubricant film at 800℃and consequently let the composite coating present the best tribological properties.Meanwhile,a small number of hard particles could play a good bearing role during friction and improve the tribological properties of the composite coating.