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The Effect of Sintering Temperature on the Phase Composition and Mechanical Properties of Al2O3-TiC-TiN Ceramic Tool Materials
Yuhuan Fei1,2, Chuanzhen Huang3,4, Hanlian Liu4, Tianen YANG5, Jikang XU6
1 School of Engineering, Qufu Normal University, Rizhao 276826, P. R. China
2 Rizhao Huilian Zhongchuang Institute of Intelligent Technology, Rizhao 276826, P. R. China
3 School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, P. R. China
4 Center for Advanced Jet Engineering Technologies (CaJET), Key Laboratory of High-efficiency and Clean Mechanical Manufacture (Ministry of Education), National Experimental Teaching Demonstration Center for Mechanical Engineering (Shandong University), Sch
5 School of Mechanical Engineering, Sichuan University, Chengdu 610065, P. R. China
6 College of Transportion, Shandong University of Science and Technology, Qingdao 266590, P.R. China
received December 22, 2020, received in revised form May 15, 2021, accepted May 27, 2021
Vol. 12, No. 2, Pages 97-106 DOI: 10.4416/JCST2020-00028
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.
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Keywords
Al2O3-TiC-TiN, sintering temperature, phase composition, mechanical properties
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