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以铸造碳化钨(WC/W2C P)为增强颗粒,利用真空熔烧工艺制备了一种结构增韧的金属基复合材料。利用SEM,EDS,显微硬度测试和图像分析等手段研究了WC/W2C P表面改性前、后复合材料中颗粒增强区域(WC/W2C P-Ni Cr BSi)的微观组织结构和性能;利用环-盘式磨损试验机研究了WC/W2C P表面改性对复合材料在室温和600℃时的磨料磨损性能的影响。结果表明,经表面改性后WC/W2C P在Ni Cr BSi基体中的分解得到了有效抑制,颗粒内部WC/W2C共晶组织的含量与未改性的颗粒相比提高了1.6倍。以表面改性的WC/W2C P为增强颗粒能显著降低复合材料在室温和高温时的磨损率。在600℃时磨损表面形成了层状结构的保护膜,致使复合材料的磨损率低于室温时的磨损率。
To cast tungsten carbide (WC / W2C P) as reinforcing particles, a structure-toughened metal matrix composite was prepared by vacuum melting process. The microstructure and properties of WC / W2C P-Ni Cr BSi in WC / W2C P pre-and post-surface modification composites were investigated by SEM, EDS, microhardness test and image analysis. Ring-disc abrasion tester was used to investigate the effect of WC / W2C P surface modification on abrasive wear properties of composites at room temperature and 600 ℃. The results showed that the surface modification of WC / W2C P in NiCrBi matrix was effectively inhibited, and the content of WC / W2C eutectic in the interior of the particles was 1.6 times higher than that of unmodified particles. Surface-modified WC / W2C P particles can significantly reduce the wear rate of the composites at room temperature and high temperature. At 600 ℃, the surface of the wear layer formed a protective film with a layered structure, resulting in the wear rate of the composite material being lower than that at room temperature.