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Re含量对TiCN–WC–HfN陶瓷微观组织和力学性能的影响

Effect of Re content on microstructure and mechanical properties of TiCN–WC–HfN ceramics

    摘要
  • 摘要: 采用真空热压烧结技术制备了TiCN–WC–HfN陶瓷，研究了Re含量（摩尔分数）对其微观组织和力学性能的影响。结果表明：TiCN–WC–HfN–Ni–Re陶瓷材料由TiC0.41N0.5、WC、HfN、TiC、Ni和Re组成，其中TiC0.41N0.50是TiC与TiN在烧结过程中生成的固溶体。TiCN–WC–HfN–Ni–Re陶瓷材料断口上存在凹坑和解理面，当Re摩尔分数为2.5%时，材料断口上的凹坑较多。当Re摩尔分数由0增到3.0%时，材料的维氏硬度、抗弯强度和断裂韧度均先增大后减小。当Re摩尔分数为2.5%时，材料的力学性能最优，其维氏硬度为(19.25±0.21) GPa、抗弯强度为(1304±23) MPa、断裂韧度为(7.73±0.22) MPa∙m1/2。TiCN–WC–HfN–Ni–Re陶瓷在断裂过程中发生了穿晶断裂和沿晶断裂，其增韧机制为裂纹偏转和裂纹桥连。

     

    Abstract: TiCN–WC–HfN ceramics were prepared by vacuum hot pressing sintering technology, and the effects of Re contents (molar fraction) on the microstructure and mechanical properties of the ceramics were investigated. The results show that, the TiCN–WC–HfN–Ni–Re ceramics are composed of TiC0.41N0.5, WC, HfN, TiC, Ni and Re, and TiC0.4N0.50 is the solid solution formed between TiC and TiN in the sintering process. Micro-pits and cleavage planes are discovered in the fracture surface of TiCN–WC–HfN ceramics with the different molar fraction of Re. When the molar fraction of Re is 2.5%, there are more micro-pits on the ceramic fractures. When the mole fraction of Re increases from 0 to 3.0%, the Vickers hardness, flexural strength, and fracture toughness of the TiCN–WC–HfN ceramics first increase and then decrease. When the mole fraction of Re is 2.5%, the mechanical properties of the ceramics show the best as the Vickers hardness is (19.25±0.21) GPa, bending strength is (1304±23) MPa, and fracture toughness is (7.73±0.22) MPa∙m1/2. Transgranular fracture and intergranular fracture of the TiCN–WC–HfN–Ni–Re ceramics occur during the fracture process, and the toughening mechanisms are the crack deflection and crack bridging.

     

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