Microstructure and Mechanical Properties of Al2O3/Ni Cermet

Abstract

Abstract: Ni-coated Al₂O₃ powders with different Ni content were prepared by the coating technique. The powders were sintered by hot-pressing, and Al₂O₃/Ni cermet obtained. Results show that
the densification is enhanced with the increase of temperature, and when temperature is more than 1400℃, the densification is decreased with the increase of Ni content. Ni particles introduced
in Al₂O₃ ceramic matrix can reduce grain sizes, enhance strength and toughness. Compared with single phase Al₂O₃ material,
Al₂O₃/4vol% Ni cermet has flexural strength of 19% and fracture toughness of 35% enhanced. SEM photos of fracture surface show that the fracture model of the cermet changes from intergranular fracture
to transgranular fracture with the increase of Ni content.

Key words: Al₂O₃/Ni cermet, densification, microstructure, mechanical properties

CLC Number:

TB331

LI Guo-Jun,HUANG Xiao-Xian,GUO Jing-Kun. Microstructure and Mechanical Properties of Al₂O₃/Ni Cermet[J]. Journal of Inorganic Materials.

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Microstructure and Mechanical Properties of Al₂O₃/Ni Cermet

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