Microstructure and Wear Behavior of TC4 Laser Cladding Modified via SiC and MoS2
Source abstract
Abstract
A TC4 composite coating reinforced by SiC ceramic phase and MoS2 self-lubricating phase was prepared on a muzzle brake by laser cladding to improve its wear resistance properties. In this study, we investigated the microstructure and wear behavior of the composite coating. The results show that the composite coating consisted of equiaxed grains with grain sizes ranging from 102.39 to 255.31 μm on the surface and columnar grains on the bottom. The grains with mesh basket microstructure were mainly with α-Ti and β-Ti phases. When wearing against H70 brass, the main wear mechanism of the composite coating at room temperature was adhesive wear, while the wear mechanism was dominated by adhesive wear, oxidation wear, and slight abrasive wear at high temperature. Compared with TC4 coating without SiC and MoS2, the wear rate of the composite coating was reduced by 15%–35% when the temperature was below 400 °C, and the wear rate was reduced by about 55% at 600 °C, resulting from the addition of SiC. Moreover, the friction coefficient of the composite coating was about 10%, which was 30% lower than that of the substrate and TC4 coating when the temperature was below 400 °C and at 600 °C due to the forming of the dense oxide film and the MoS2 friction transfer film on the friction contact surface of the titanium-based composite coating.
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Research context
OpenAlex topics: High Entropy Alloys Studies · Metal and Thin Film Mechanics · Additive Manufacturing Materials and Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 611756, China
AVIC Chengdu Aircraft Industrial (Group) Co., Ltd., Chengdu 610091, China
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