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Abstract <p>Using MoO<sub>3</sub>, Mo, Al and Si powders as raw materials, MoSi<sub>2</sub> and MoSi<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> composite were prepared by mechanochemical reduction and hot press sintering techniques. The microstructure and dry sliding wear behavior of the samples were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and a ball-on-disk reciprocating tribometer. The results showed that MoSi<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> composite has a fine microstructure, high hardness (13.4 GPa) and fracture toughness (7.2 MPa m<sup>0.5</sup>) compared to the pure MoSi<sub>2</sub> material. The wear test results indicated that MoSi<sub>2</sub> and MoSi<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> composite exhibited good tribological properties against sliding GCr15 steel balls under different loads. The friction coefficient and wear rates of the samples decreased as the applied load increased. Compared to pure MoSi<sub>2</sub>, MoSi<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> composite exhibited better wear resistance due to its high hardness, fracture toughness and good surface lubrication characteristics. The dominant wear mechanisms of the composite were adhesion, tribo-oxidation, plastic deformation and spalling.</p>

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Preparation and Mechanical Wear Behavior of MoSi2–Al2O3 Composite

  • 期刊论文

  • 发表日期：

    2025年10月20日

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  • Xue Mao-chao

摘要

Abstract

Using MoO3, Mo, Al and Si powders as raw materials, MoSi2 and MoSi2–Al2O3 composite were prepared by mechanochemical reduction and hot press sintering techniques. The microstructure and dry sliding wear behavior of the samples were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and a ball-on-disk reciprocating tribometer. The results showed that MoSi2–Al2O3 composite has a fine microstructure, high hardness (13.4 GPa) and fracture toughness (7.2 MPa m0.5) compared to the pure MoSi2 material. The wear test results indicated that MoSi2 and MoSi2–Al2O3 composite exhibited good tribological properties against sliding GCr15 steel balls under different loads. The friction coefficient and wear rates of the samples decreased as the applied load increased. Compared to pure MoSi2, MoSi2–Al2O3 composite exhibited better wear resistance due to its high hardness, fracture toughness and good surface lubrication characteristics. The dominant wear mechanisms of the composite were adhesion, tribo-oxidation, plastic deformation and spalling.