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The Effect of Sintering Temperature on the Phase Composition and Mechanical Properties of Al₂O₃-TiC-TiN Ceramic Tool Materials

Yuhuan Fei, Yuhuan Fei, Chuanzhen Huang, Chuanzhen Huang, Hanlian Liu, Tianen YANG, Jikang XU

Journal of Ceramic Science and Technology, Vol. 12, No. 2 (2021), pp. 97-106

DOI: 10.4416/JCST2020-00028

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Abstract

Al2O3-20 vol% TiC-10 vol% TiN ceramic tool materials were fabricated with the hot-pressing technique at different sintering temperatures. The effects of the sintering temperature on the phase composition, mechanical properties, and microstructure were investigated. The results have shown that hexagonal-Mo3C2 and tetragonal-AlNi3 adversely affected the mechanical properties overall. Orthorhombic-MoNi and cubic-AlNi3 were able to improve the flexural strength and hardness, but cubic-AlNi3 decreased the fracture toughness. When the ceramic materials were sintered with the holding time of 10 minutes and sintering pressure of 32 MPa, all mechanical properties changed in the same way with the increment of the sintering temperature. The highest flexural strength of 807.4 MPa was measured when the sintering temperature was 1 650 °C, the highest Vickers hardness of 20.78 GPa was measured when the sintering temperature was 1 700 °C, the highest fracture toughness of 7.58 MPa·m1/2 was measured when the sintering temperature was 1 500 °C. The overall mechanical properties were optimal when the sintering temperature was 1 500 °C, at which the mechanical properties were 796.6 MPa, 20.5 GPa, 7.58 MPa·m1/2 for flexural strength, Vickers hardness, and fracture toughness, respectively.

Keywords

Al2O3-TiC-TiN, sintering temperature, phase composition, mechanical properties

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