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研究VC/Cr3C2对Ti(C,N)基金属陶瓷微观组织和力学性能的影响。利用光学显微镜、X射线衍射仪和扫描电镜结合能谱仪研究微观组织。测试横向断裂强度、硬度和断裂韧性等力学性能。结果表明:微观组织中存在“黑芯-灰壳”和“白芯-灰壳”结构;由于添加VC/Cr3C2,硬质相晶粒变细,添加0.75VC/0.25Cr3C2的金属陶瓷晶粒细化最明显;黑芯随着VC添加量的增加而变细,壳随着Cr3C2添加量的减少而变厚;孔隙率随着VC/Cr3C2中VC的量增加而增大;横向断裂强度和硬度均升高,并且均在添加0.25VC/0.75Cr3C2时达到最大值;按适当的VC和Cr3C2添加量比例添加VC/Cr3C2可以有效地使断裂韧性升高,并在添加0.5VC/0.5Cr3C2时取得最大值。
The effect of VC / Cr3C2 on the microstructure and mechanical properties of Ti (C, N) -based cermets was investigated. The microstructure was studied by optical microscope, X-ray diffraction and scanning electron microscopy combined with EDS. Test transverse rupture strength, hardness and fracture toughness and other mechanical properties. The results show that there are “black core-gray shell” and “white core-gray shell” structure in the microstructure. Due to the addition of VC / Cr3C2, the grain of the hard phase becomes thinner and the metal of 0.75VC / 0.25Cr3C2 The grain refinement of ceramics is the most obvious. The black core becomes thinner with the addition of VC, and the shell becomes thicker with the decrease of Cr3C2 addition. The porosity increases with the increase of VC in VC / Cr3C2. The fracture strength and hardness increased, and both reached the maximum value when 0.25VC / 0.75Cr3C2 was added. The addition of VC / Cr3C2 to the proper proportion of VC / Cr3C2 could effectively increase the fracture toughness and add 0.5VC / 0.5Cr3C2 obtained maximum.