Microstructure and Mechanical Properties of the Intra/Inter-type Al2O3/Ni Nanocermets

Abstract

Abstract: Al₂O₃/Ni nanocermets were prepared by the heterogeneous precipitation method and hot-pressing technique. The strengthening and toughening
mechanisms of the nanocermets with respect to the microstructure were analyzed.Hot-pressed at 1450℃, a more than 98% theoretical density of the
cermets can be achieved. Microstructural observations reveal that Ni grains are uniformly dispersed in the Al₂O₃ matrix, some fine Ni grains of less than
100nm are entrapped within Al₂O₃ grains, some Ni grains about 100～300nm are distributed at the grain boundaries, forming intra/inter-type nanocermets.
With Ni addition, the three-point bending strength and the fracture toughness of the dense Al₂O₃/Ni cermets increase by 26% and 79%, respectively.

Key words: Al₂O₃/Ni nanocermets, heterogeneous precipitation method, microstructure, me- chanical properties

CLC Number:

TB331

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

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Microstructure and Mechanical Properties of the Intra/Inter-type Al₂O₃/Ni Nanocermets

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