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<p>MAX phases had the strengthening role in thermal barrier coatings (TBCs), which improved their wear resistance at high temperature. In this study, Ti<sub>3</sub>AlC<sub>2</sub> was added into NiCoCrAlY TBC to enhance its hardness, and the effect of Ti<sub>3</sub>AlC<sub>2</sub> mass fraction on the tribological properties and wear mechanism of xTi<sub>3</sub>AlC<sub>2</sub>-CoCrAlY TBCs at 500&#xa0;°C was investigated using a ball–on–disc wear tester. The results demonstrate that the microstructure of NiCoCrAlY TBCs is refined by the addition of Ti<sub>3</sub>AlC<sub>2</sub>, and their hardness is increased with the Ti<sub>3</sub>AlC<sub>2</sub> mass fraction. The friction reduction and wear resistance of xNi<sub>3</sub>AlC<sub>2</sub>-NiCoCrAlY TBCs are increased with the Ti<sub>3</sub>AlC<sub>2</sub> mass fraction, showing that the Ti<sub>3</sub>AlC<sub>2</sub> has the superior friction reduction and wear resistance. The wear mechanism is combined of adhesive wear and oxidative wear, which is relied on the self–lubrication and hardness improvement of xTi<sub>3</sub>AlC<sub>2</sub>-CoCrAlY TBCs by the addition of Ti<sub>3</sub>AlC<sub>2</sub>.</p>

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Microstructure, Phase Transition and Wear Behavior of Ti3AlC2 Reinforced NiCoCrAlY Thermal Barrier Coatings by Laser Cladding

  • 期刊论文

  • 发表日期：

    2025年2月19日

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  • Guihua Ni,
  • Han Pan,
  • Dejun Kong

摘要

MAX phases had the strengthening role in thermal barrier coatings (TBCs), which improved their wear resistance at high temperature. In this study, Ti3AlC2 was added into NiCoCrAlY TBC to enhance its hardness, and the effect of Ti3AlC2 mass fraction on the tribological properties and wear mechanism of xTi3AlC2-CoCrAlY TBCs at 500 °C was investigated using a ball–on–disc wear tester. The results demonstrate that the microstructure of NiCoCrAlY TBCs is refined by the addition of Ti3AlC2, and their hardness is increased with the Ti3AlC2 mass fraction. The friction reduction and wear resistance of xNi3AlC2-NiCoCrAlY TBCs are increased with the Ti3AlC2 mass fraction, showing that the Ti3AlC2 has the superior friction reduction and wear resistance. The wear mechanism is combined of adhesive wear and oxidative wear, which is relied on the self–lubrication and hardness improvement of xTi3AlC2-CoCrAlY TBCs by the addition of Ti3AlC2.