中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心知识库

The NiCoCrAlYTa/10Ag/5Mo self-adaptive lubricating composite coating was designed and prepared by high velocity oxy-fuel (HVOF) spraying technology, and its hot corrosion and high-temperature tribological behaviors as well as the interaction mechanisms were investigated. A tremendous amount of  β -Ag₂MoO₄ generated on the surface and acted as a lubricant film during friction when the composite coating was oxidized in no salt condition.  The  oxidizing process  would  be accelerated  while the  composite  coating was  exposed  to  molten salt mixtures. The boundaries between the reinforcement and matrix phases in the coating were firstly corroded and then produced NiO, Al₂O₃, Cr₂O₃ and the other porous oxides. And there was a continuous and protective rich-(Al, Cr) oxide scale on the surface of composite coating after molten 75Na₂SO₄  + 25NaCl and 75Na₂SO4 +20NaCl +5V₂O₅  (wt%)  salts  corrosion.  Besides,  the  mechanical  and  tribological  properties  of  the  corroded 
composite coating were improved. Compared to the case in molten Na₂SO₄-NaCl salt, the composite coating exposed to molten Na₂SO₄-NaCl-V₂O₅ salt was corroded more severely but had better mechanical properties and wear resistance.