Preparation and Properties of B₄C-MoS₂ Dual-Phase Doped Aluminum Matrix Composite Coatings AITranslate

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Basic Information:

DOI：10.13373/j.cnki.cjrm.XY23120012

Chinese Library Classification Number:TG1

Citation Information:

To investigate the synergistic effects of hard reinforcement phases and soft lubricating phases on the microstructure and wear performance of cold-sprayed aluminum-based composite coatings. In this paper, the cold spraying technology was used to prepare pure Al coating and Al/30%B₄C coating, as well as biphase reinforced coatings of 28% B₄C/2% MoS₂, 26% B₄C/4% MoS₂ and 24% B₄C/6% MoS₂, respectively. The microstructure of the coatings was analyzed using scanning electron microscopy （SEM），and the mechanical properties were characterized using a Vickers microhardness tester. The wear performance of the coatings was tested using a friction and wear testing machine. The study aimed to investigate the influence of different ratios of reinforcing phase powders on the phase composition，microstructure，hardness，wear performance and wear mechanisms of the coatings. In the composite coating，the original powder's phase components were retained，and no new phases were found. Due to the low content of MoS₂，the diffraction peak intensity was also low in Al/B₄C/MoS₂ composite coatings，with most strong peaks originating from the aluminum matrix. The significant plastic deformation of aluminum particles occurred during the deposition process，showing flattened deformation characteristics，and the particles were tightly bonded to each other. B₄C particles were randomly distributed at the boundaries of the matrix particles. Although the matrix material exhibited considerable deformation，B₄C particles maintained their original angular shape. MoS₂ in the coating was squeezed at the interface of Al/Al particles，and MoS₂ accumulation was observed at the interface of Al/B₄C particles. With the increase in the original powder MoS₂ content，the uniformity of MoS₂ distribution within the composite coating increased. The porosity of pure aluminum coating （Coating C1）was 1.478%. The addition of hard reinforcement particles significantly reduced the porosity，with a porosity of 0.602% for the coating with only B₄C reinforcement （Coating C2）. The porosity for composite coatings with 2%，4% and 6% added MoS₂ in the raw material was 0.626%，0.678% and 0.684%，respectively. At the interface of Al/B₄C particles，there was a large gradient in the change of Al and B elements，and the high-speed particle impact caused adiabatic heating，forming a mixed region of about 0.8 μm thickness at Al/MoS₂ interface. The introduction of hard phases and the impact of particles resulted in a higher hardness of the composite coating compared to pure aluminum coating. The hardness of the aluminum-based coating with 30% B₄C reinforcement was HV_0.2 90.12，which was 46.4% higher than that of the pure aluminum coating. The hardness improvement was mainly due to the work hardening caused by subsequent particle impacts and the ability of hard B₄C particles to hinder the deformation of Al particles，thus increasing the material's resistance to indentation. With the increase in MoS₂ content，the microhardness of the composite coating with a soft phase increased. The hardness of B₄C/MoS₂ dual-phase-enhanced coating decreases by 4.4%，8.9% and 17.5% compared to 30% single-phase B₄C-enhanced coating （Coating C2）. The average friction coefficient of the pure aluminum coating （Coating C1）was 0.65，and the wear rate was 3.22×10⁻⁶ mm³‧N⁻¹‧m⁻¹. The coating with 30% B₄C （Coating C2）had an average friction coefficient of 0.57 and a wear rate of 1.53×10⁻⁶ mm³‧N⁻¹‧m⁻¹. With the addition of MoS₂，the average friction coefficient of the composite coating decreased from 0.62 （Coating C3）to 0.39 （Coating C5），and the wear rate decreased from 2.01×10⁻⁶ mm³‧N⁻¹‧m⁻¹ （Coating C3）to 1.32×10⁻⁶ mm³‧N⁻¹‧m⁻¹ （Coating C5）. The wear mechanism of the pure aluminum coating was mainly adhesive wear and oxidative wear. When only 30% B₄C was added as a reinforcing phase，the wear mechanism of the coating was mainly abrasive wear，oxidative wear，and fatigue wear. As MoS₂ content in the coating increased，the surface stratification phenomenon intensified，promoting the release of MoS₂ solid lubricating phase towards the friction interface，aiding in the formation of a lubricating film. The formation of the friction film on the surface reduces oxidative wear in B₄C/MoS₂ dual-phase composite coating. When B₄C content was 28% and MoS₂ content was 2%，MoS₂ released to the friction interface was low，and the wear mechanism was mainly abrasive wear with higher oxidative wear. When B₄C content was 26% and MoS₂ content was 4%，MoS₂ released to the friction interface increased，promoting the formation of the surface friction film，and the wear mechanism was mainly abrasive wear，oxidative wear and delamination wear. When B₄C content was 24% and MoS₂ content was 6%，although the higher MoS₂ content in the coating reduced the hardness，the significant reduction in shear action resulted in a lower friction coefficient. The wear mechanism was mainly abrasive wear，oxidative wear and severe delamination wear. The cold spray technology had successfully fabricated B₄C/MoS₂ dual-phase enhanced aluminum-based composite coating while retaining the original powder phase composition，and the addition of B₄C particles in the coating enhanced the deformation resistance of the aluminum coating. The lubricating film formed by the release of MoS₂ in the coating reduced the shear action during the friction process，and the synergistic effect of B₄C and MoS₂ collaboratively lowered the friction coefficient and wear rate of the coating.