Effects of metal binder on the microstructure and mechanical properties of Al<sub>2</sub>O<sub>3</sub>-based micro-nanocomposite ceramic tool material

Xiu-ying Ni; Jun Zhao; Jia-lin Sun; Feng Gong; Zuo-li Li

doi:10.1007/s12613-017-1466-6

Volume 24 Issue 7

Jul. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(7): 826-832

Xiu-ying Ni, Jun Zhao, Jia-lin Sun, Feng Gong, and Zuo-li Li, Effects of metal binder on the microstructure and mechanical properties of Al₂O₃-based micro-nanocomposite ceramic tool material, Int. J. Miner. Metall. Mater., 24(2017), No. 7, pp. 826-832. https://doi.org/10.1007/s12613-017-1466-6

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Xiu-ying Ni, Jun Zhao, Jia-lin Sun, Feng Gong, and Zuo-li Li, Effects of metal binder on the microstructure and mechanical properties of Al2O3-based micro-nanocomposite ceramic tool material, Int. J. Miner. Metall. Mater., 24(2017), No. 7, pp. 826-832. https://doi.org/10.1007/s12613-017-1466-6

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Research ArticleOpen Access

Effects of metal binder on the microstructure and mechanical properties of Al₂O₃-based micro-nanocomposite ceramic tool material

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Corresponding author:
Jun Zhao E-mail: zhaojun@sdu.edu.cn
Received: 13 December 2016; Revised: 24 February 2017; Accepted: 25 February 2017

Abstract

Abstract

The Al₂O₃-(W,Ti)C composites with Ni and Mo additions varying from 0vol% to 12vol% were prepared via hot pressing sintering under 30 MPa. The microstructure was investigated via X-ray diffraction (XRD) and scanning electron microscopy (SEM) equipped with energy dispersive spectrometry (EDS). Mechanical properties such as flexural strength, fracture toughness, and Vickers hardness were also measured. Results show that the main phases Al₂O₃ and (W,Ti)C were detected by XRD. Compound MoNi also existed in sintered nanocomposites. The fracture modes of the nanocomposites were both intergranular and transgranular fractures. The plastic deformation of metal particles and crack bridging were the main toughening mechanisms. The maximum flexural strength and fracture toughness were obtained for 9vol% and 12vol% additions of Ni and Mo, respectively. The hardness of the composites reduced gradually with increasing content of metals Ni and Mo.
- ceramic matrix nanocomposite;
- metal phase;
- microstructure;
- mechanical properties

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