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<p>Wear is a substantial element contributing to material failure, particularly under high temperature. A set of solid self-lubricant composites of Ti<sub>2</sub>AlNb–10Ag–xTiB<sub>2</sub> were fabricated by spark plasma sintering. The tribological behavior and mechanical properties of the composites on high temperature were investigated. The results showed that the compressive strength and ductility of the composites were improved with the addition of TiB<sub>2</sub>, especially at high temperature. The friction coefficients were stable and the wear rates were decreased with the addition of TiB<sub>2</sub>. TiB<sub>2</sub> plays a role of transferring loads, allowing the matrix to participate in deformation, thereby simultaneously improving the strength and ductility of the composites. The enhanced wear resistance can be attributed to the high strength and mircohardness of the composites and the role of a wear-resistant skeleton of TiB<sub>2</sub>. Considering the mechanical properties and tribological behaviors, Ti<sub>2</sub>AlNb–10Ag–5TiB<sub>2</sub> had the best comprehensive performance. Compared with Ti<sub>2</sub>AlNb–10Ag, the ultimate compressive strength of Ti<sub>2</sub>AlNb–10Ag–5TiB<sub>2</sub> was increased by 28.8% and the wear rate was decreased by 38.5% at 500&#xa0;°C.</p>

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The impact of TiB2 on the microstructure, high-temperature mechanical properties and tribological behaviors of Ti2AlNb–Ag–xTiB2 composites

  • 期刊论文

  • 发表日期：

    2025年9月5日

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  • Ziru Han,
  • Wei Wang,
  • Haixiong Zhou,
  • Qingjuan Wang

摘要

Wear is a substantial element contributing to material failure, particularly under high temperature. A set of solid self-lubricant composites of Ti2AlNb–10Ag–xTiB2 were fabricated by spark plasma sintering. The tribological behavior and mechanical properties of the composites on high temperature were investigated. The results showed that the compressive strength and ductility of the composites were improved with the addition of TiB2, especially at high temperature. The friction coefficients were stable and the wear rates were decreased with the addition of TiB2. TiB2 plays a role of transferring loads, allowing the matrix to participate in deformation, thereby simultaneously improving the strength and ductility of the composites. The enhanced wear resistance can be attributed to the high strength and mircohardness of the composites and the role of a wear-resistant skeleton of TiB2. Considering the mechanical properties and tribological behaviors, Ti2AlNb–10Ag–5TiB2 had the best comprehensive performance. Compared with Ti2AlNb–10Ag, the ultimate compressive strength of Ti2AlNb–10Ag–5TiB2 was increased by 28.8% and the wear rate was decreased by 38.5% at 500 °C.