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采用热等静压法制备Ni3Al合金和Cr_3C_2含量不同的Ni3Al基复合耐磨材料,利用扫描电镜、能谱仪、X射线衍射仪及摩擦磨损试验机,系统地研究Cr_3C_2含量对材料组织特征、硬度及摩擦磨损性能的影响.结果表明:Cr_3C_2/Ni3Al复合材料中,Cr_3C_2颗粒与Ni3Al颗粒之间发生互扩散作用,使部分Cr_3C_2颗粒转变为M7C3(M=Cr,Fe,Ni)结构;在特定的摩擦磨损条件下,随着Ni3Al基体中Cr_3C_2比例增大,Cr_3C_2/Ni3Al复合材料的耐磨性能显著提高,达到了Ni3Al合金耐磨性能的4~10倍.此外,随着Ni3Al基体中Cr_3C_2比例的增大,Cr_3C_2/Ni3Al复合材料对对磨盘的切削、刮擦作用减弱,对磨盘的磨损量减少.
Ni3Al-based composite wear resistant materials with different contents of Ni3Al and Cr_3C_2 were prepared by hot isostatic pressing. The effects of Cr_3C_2 content on the microstructure and properties of the Ni3Al-based composites were studied systematically with scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and friction and wear testing machines. And friction and wear properties of Cr_3C_2 / Ni_3Al composites were investigated. The results show that intergranular diffusion takes place between Cr_3C_2 particles and Ni_3Al particles and some Cr_3C_2 particles transform to M_7C_3 (M = Cr, Fe, Ni) Under tribological conditions, the wear resistance of Cr3C2 / Ni3Al composites increases significantly with the increase of Cr3C2 ratio in Ni3Al matrix, reaching 4 ~ 10 times the wear resistance of Ni3Al alloy.In addition, with the increase of Cr3C2 ratio in Ni3Al matrix Increases, Cr_3C_2 / Ni3Al composite on the disc cutting, scratching weakened, reducing the wear on the disc.