Antioxidation and Friction-reduction Effects of WC-NiMoCrFeCo-B2O3 Composite Coatings under Synergistic Action of Laser Texturing and Solid Lubricants at 25 ℃ and 800 ℃

MENG Qingrong; ZHANG Yuhang; HU Yongjun; LIU Min; LI Shuangjian; FAN Xiujuan; LI Kang; WANG Chengfeng

doi:10.16490/j.cnki.issn.1001-3660.2026.11.023

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Surface Technology ›› 2026, Vol. 55 ›› Issue (11) : 273-288. DOI: 10.16490/j.cnki.issn.1001-3660.2026.11.023

Antioxidation and Friction-reduction Effects of WC-NiMoCrFeCo-B₂O₃ Composite Coatings under Synergistic Action of Laser Texturing and Solid Lubricants at 25 ℃ and 800 ℃

MENG Qingrong^1,2, ZHANG Yuhang^2,3, HU Yongjun^1,*, LIU Min^1,2, LI Shuangjian^2,*, FAN Xiujuan², LI Kang², WANG Chengfeng²

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Abstract

Coatings with high temperature tribological properties are very important for marine diesel engines and marine gas turbines equipped with marine engineering equipment. For example, the theoretical working temperature of the bleed valve, low pressure fuel pump and high pressure fuel pump inside the marine gas turbine can reach 600 ℃, and the theoretical working temperature of the fuel injector inside the marine gas turbine and the oil separator inside the fuel system of the marine diesel engine can reach 720 ℃, all the above components are faced with the problems of oxidation corrosion and friction and wear at high temperature, which greatly reduces the structural reliability of the product itself and seriously affects the service life of the product. It is urgent to develop an integrated coating preparation technology to meet the high temperature self-lubricating performance of all product parts. WC-NiMoCrFeCo is sprayed on the surface of Ti6Al4V titanium alloy by supersonic flame spraying, and hexagonal honeycomb grooves are machined on the surface of the WC-NiMoCrFeCo composite coating by laser texture processing, the B₂O₃ powders are evenly coated in the groove after laser texturing, and the WC-NiMoCrFeCo-B₂O₃composite coating (S2) is prepared by high temperature vacuum impregnation progress, so as to obtain better high temperature friction performance. The materials characterization tests are carried out by field emission electron microscope, X-ray diffractometer and X-ray photo-electron spectrometer, etc., in order to study the oxidation phenomenon of the composite coating (S2) at 800 ℃ and the friction and wear properties of the composite coating (S2) at 25 ℃ and 800 ℃. Through the above experiments, it is found that: the lubricating phase of the composite coating (S2) is tightly filled, the distribution of the lubricating phase is uniform, the overall structure is compact, and there are no defects such as cracks on the surface, the coating has good spraying quality. The composite coating (S2) has no oxidation reaction at the position covered by B₂O₃ at 800 ℃, and oxidation reaction occurs at the position not covered by B₂O₃. This phenomenon shows that B₂O₃ has an important influence on the high temperature oxidation resistance of the composite coating (S2) at high temperature. B₂O₃ has a certain viscosity, diffusion coefficient and shear modulus at 800 ℃, and it migrates to the contact zone due to the influence of the shear force during friction, and B₂O₃ has chemical stability and high temperature oxidation resistance. The surface of the unmodified composite coating (S1) undergoes oxidation reaction at 800 ℃, the surface is accompanied by dense yellow oxide. The composition and micro-structure of the surface of the unmodified composition coating (S1) are analyzed, and it is known that the main oxides are NiWO₄ and WO₃. At the initial stage of the oxidation reaction, the oxygen content near the surface of the composite coating (S1) is sufficient, and the oxidation reaction is mainly dominated by the interface reaction. Tungsten on the surface of the composite coating (S1) preferentially reacts with oxygen to generate WO₃, and the CO₂ generated by the reaction enters the atmosphere. With the increase of the temperature, the energy of molecules gradually increases, the movement becomes more intense, the percentage of activated molecules increases, the inward diffusion of oxygen ions increases oxides, and the adsorption between molecules increases. Ni and WO₃ undergo an oxidation reaction to generate NiWO₄, which is effectively adsorbed on the coating surface, and WO₃ particles are wrapped in cotton-like NiWO₄ and melted together. The friction coefficient of the composite coating (S2) is lower than that of the unmodified composite coating (S1) at 25 ℃ and 800 ℃. The lubricity of the composite coating (S2) is better at 800 ℃ than that at 25 ℃. This phenomenon is due to the high temperature synergistic lubrication mechanism of the lubricating phase of the composite coating (S2). The surface design of the composite coating combined with texture grooves and B₂O₃ lubrication may meet the requirements of improving the high temperature tribological properties of the hard wear-resistant coating.

Key words

thermal spraying technology / laser texture / WC-NiMoCrFeCo-B₂O₃ composite coating / high temperature oxidation resistance / high temperature tribology / self-lubricating mechanism

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MENG Qingrong, ZHANG Yuhang, HU Yongjun, LIU Min, LI Shuangjian, FAN Xiujuan, LI Kang, WANG Chengfeng. Antioxidation and Friction-reduction Effects of WC-NiMoCrFeCo-B₂O₃ Composite Coatings under Synergistic Action of Laser Texturing and Solid Lubricants at 25 ℃ and 800 ℃[J]. Surface Technology. 2026, 55(11): 273-288

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