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Cr3C2含量對Cr3C2/Ni3Al復合材料摩擦磨損性能的影響

Influence of Cr3C2 content on the wear properties of Cr3C2/Ni3Al composites

  • 摘要: 采用熱等靜壓法制備Ni3Al合金和Cr3C2含量不同的Ni3Al基復合耐磨材料,利用掃描電鏡、能譜儀、X射線衍射儀及摩擦磨損試驗機,系統地研究Cr3C2含量對材料組織特征、硬度及摩擦磨損性能的影響.結果表明:Cr3C2/Ni3Al復合材料中,Cr3C2顆粒與Ni3Al顆粒之間發生互擴散作用,使部分Cr3C2顆粒轉變為M7C3(M=Cr,Fe,Ni)結構;在特定的摩擦磨損條件下,隨著Ni3Al基體中Cr3C2比例增大,Cr3C2/Ni3Al復合材料的耐磨性能顯著提高,達到了Ni3Al合金耐磨性能的4~10倍.此外,隨著Ni3Al基體中Cr3C2比例的增大,Cr3C2/Ni3Al復合材料對對磨盤的切削、刮擦作用減弱,對磨盤的磨損量減少.

     

    Abstract: A The Ni3Al-alloy and its composites with different Cr3C2 contents were fabricated by a hot isostatic pressing (HIP) technique. The influences of Cr3C2 content on the microstructure, hardness and wear properties of the Cr3C2/Ni3 Al composites were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and wear tribometry. The results show that inter-diffusion occurs between the original Cr3C2 and the Ni3AI particles during the HIP process and the Cr3C2 particles partially transform into M7C3 (M=Cr, Fe, Ni) structures. Under specific friction and wear conditions, the wear resistance of the Cr3C2/Ni3Al composites is significantly improved due to the addition of Cr3C2 particles by about 4-10 times, compared to the Ni3Al alloy. In addition, the cutting and scraping effects of counter-part disks by the Cr3C2/Ni3Al composites decreases with increasing Cr3C2 addition, resulting in a reduction in wear rate of counter-part disks.

     

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