ZrB2 based composites containing 10 vol.-% carbon nanotubes (CNTs) are synthesised by spark plasma sintering at temperatures ranging from 1600 to 18008C and at an applied pressure of 25 MPa. The effects of sintering temperature on densification behaviour, microstructural evolutions and mechanical properties are presented. Results indicate that ZrB2-CNT composites fabricated at 16508C have the optimal combination of dense microstructure and properties. The fracture toughness is sensitive to the temperature change and reaches 7.2 MPa m1/2 for the CNT toughened ZrB2 ceramics, which is higher than the measured result for monolithic ZrB2 (3.3 MPa m1/2). The crack deflection and CNT pullout are the dominant toughening mechanisms.

中文翻译：

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多壁碳纳米管增韧放电等离子体烧结ZrB2复合材料的显微组织和力学性能

含有 10 vol.-% 碳纳米管 (CNT) 的 ZrB2 基复合材料是通过放电等离子烧结在 1600 至 18008C 的温度和 25 MPa 的施加压力下合成的。介绍了烧结温度对致密化行为、微观结构演变和机械性能的影响。结果表明，在 16508C 下制造的 ZrB2-CNT 复合材料具有致密的微观结构和性能的最佳组合。CNT增韧ZrB2陶瓷的断裂韧性对温度变化敏感，达到7.2 MPa m1/2，高于整体ZrB2的测量结果（3.3 MPa m1/2）。裂纹偏转和碳纳米管拔出是主要的增韧机制。