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利用高能球磨法和放电等离子烧结技术制备了纳米WC/MgO复合材料,研究了烧结温度和烧结压力对WC-8wt%MgO复合材料密度、硬度和断裂韧性的影响。结果表明,烧结温度过低,试样的致密度差;烧结温度过高,晶粒快速长大,使得复合材料性能降低;烧结压力越大,复合材料的致密度越高,硬度和断裂韧性越好。最佳烧结工艺是烧结温度1650℃,烧结压力70 MPa,获得了该复合块体材料的最佳性能组合。
The WC / MgO nanocomposites were prepared by high energy ball milling and spark plasma sintering. The effects of sintering temperature and sintering pressure on the density, hardness and fracture toughness of WC-8wt% MgO composites were investigated. The results show that the sintering temperature is too low, the sample density is poor; the sintering temperature is too high, the rapid growth of the grain, making the composite performance decreases; the sintering pressure is higher, the higher the density of the composite material, the more the hardness and fracture toughness it is good. The best sintering process is sintering temperature 1650 ℃, sintering pressure 70 MPa, get the best performance combination of the composite block material.