ABSTRACT Fully dense WC-Al2O3 platelet composites with VC additive were fabricated by hot-press sintering. Their mechanical properties and microstructure were examined. The contents of Al2O3 platelet (Al2O3pl) and VC were optimised. The fracture toughness of WC-based composites would be obviously improved with Al2O3pl addition. The defined addition of VC was beneficial for the densification and improved mechanical properties of the WC-based composites. The microstructure of the composites was fine, compact and homogeneous compared with the composites without VC addition. The range of fracture toughness of WC-Al2O3pl composites was 9.3–13.5 MPa m1/2. The flexural strength of the composites varied a little and the maximum was 1289 MPa when the content of Al2O3pl was 5 vol.-%, the content of VC was 0.5wt-%.

中文翻译：

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Al2O3薄片和VC添加剂对WC基复合材料热压烧结和力学性能的影响

摘要 通过热压烧结制备了含 VC 添加剂的全致密 WC-Al2O3 片状复合材料。研究了它们的机械性能和微观结构。优化了 Al2O3 片晶 (Al2O3pl) 和 VC 的含量。Al2O3pl 的加入显着提高了WC 基复合材料的断裂韧性。VC 的确定添加量有利于 WC 基复合材料的致密化和改善的机械性能。与未添加VC的复合材料相比，复合材料的微观结构精细、致密且均匀。WC-Al2O3pl 复合材料的断裂韧性范围为 9.3-13.5 MPa m1/2。当Al2O3pl含量为5 vol.-%，VC含量为0.5wt-%时，复合材料的抗弯强度变化不大，最大值为1289 MPa。