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<p>The demand for lightweight materials with enhanced mechanical and wear-resistance properties has spurred significant research in the field of surface modification of magnesium alloys. In this work, Co-TiC-CaF<sub>2</sub> metal matrix composite (MMC) coating has been produced on magnesium alloy AZ91D substrate by plasma transferred arc (PTA) coating process. The effect of scan speed, PTA current, and CaF<sub>2</sub> content on microhardness, coefficient of friction (COF), and wear rate of Co-TiC-CaF<sub>2</sub> coating have been studied. The x-ray diffraction, SEM, and energy-dispersive x-ray spectrometry (EDS) have been used to determine the phases, morphology of the coated surface, and chemical elements. The findings revealed that the coatings are compact and uniform with some microcracks and voids, with Co, TiC, and CaF<sub>2</sub> particles evenly distributed and metallurgically bonded to the substrate. Under optimal parameters, Co-TiC-CaF<sub>2</sub> composite coating exhibits maximum average microhardness value of 958&#xa0;HV<sub>0.05</sub>, compared to 68&#xa0;HV<sub>0.05</sub> of Mg alloy AZ91D substrate. This exhibits that the clad layer offers 14 times greater hardness than the magnesium alloy AZ91D substrate. The wear rate of Co-TiC-CaF<sub>2</sub> MMC composite coating was measured as 2.05 × 10<sup>-8</sup>&#xa0;g/N-m, while wear rate of the substrate AZ91D Mg was 79.23 × 10<sup>-8</sup>&#xa0;g/N-m. Therefore, the coating has 38 times more wear resistance than Mg alloy AZ91D substrate. Comparison to substrate, sample CTC-10 exhibits smooth worn surface and lower COF. This comprehensive study offers valuable information on developing advanced surface coatings for magnesium alloys. Hence, lightweight materials with improved tribological performance can be used in the industries which require lightweight of the engineering components.</p>

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Investigation on Tribological Characteristics of Plasma Transferred Arc Cladded Co-TiC-CaF2 Metal Matrix Composite Coating Produced on Magnesium Alloy AZ91D Substrate

  • 期刊论文

  • 发表日期：

    2025年4月3日

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  • Anil Kumar Das,
  • Ravi Kumar

摘要

The demand for lightweight materials with enhanced mechanical and wear-resistance properties has spurred significant research in the field of surface modification of magnesium alloys. In this work, Co-TiC-CaF2 metal matrix composite (MMC) coating has been produced on magnesium alloy AZ91D substrate by plasma transferred arc (PTA) coating process. The effect of scan speed, PTA current, and CaF2 content on microhardness, coefficient of friction (COF), and wear rate of Co-TiC-CaF2 coating have been studied. The x-ray diffraction, SEM, and energy-dispersive x-ray spectrometry (EDS) have been used to determine the phases, morphology of the coated surface, and chemical elements. The findings revealed that the coatings are compact and uniform with some microcracks and voids, with Co, TiC, and CaF2 particles evenly distributed and metallurgically bonded to the substrate. Under optimal parameters, Co-TiC-CaF2 composite coating exhibits maximum average microhardness value of 958 HV0.05, compared to 68 HV0.05 of Mg alloy AZ91D substrate. This exhibits that the clad layer offers 14 times greater hardness than the magnesium alloy AZ91D substrate. The wear rate of Co-TiC-CaF2 MMC composite coating was measured as 2.05 × 10-8 g/N-m, while wear rate of the substrate AZ91D Mg was 79.23 × 10-8 g/N-m. Therefore, the coating has 38 times more wear resistance than Mg alloy AZ91D substrate. Comparison to substrate, sample CTC-10 exhibits smooth worn surface and lower COF. This comprehensive study offers valuable information on developing advanced surface coatings for magnesium alloys. Hence, lightweight materials with improved tribological performance can be used in the industries which require lightweight of the engineering components.