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Journal of Materials Science
Published in: Journal of Materials Science 17/2020

05-03-2020 | Ceramics

Dependence of Nb doping on microstructure and mechanical properties of Al2O3/Ti3SiC2 composites

Authors: Jinman Yu, Guopu Shi, Qinggang Li, Junyan Wu, Liu Zhang, Zhi Wang

Published in: Journal of Materials Science | Issue 17/2020

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Abstract

In this work, the Al2O3/Ti3SiC2 composites with different Nb doping amounts (0–5 vol%) were prepared by vacuum hot pressing sintering (30 MPa, 1450 for 1 h). Various tests and characterization had been performed on samples to investigate the dependence of Nb doping on the mechanical properties and microstructure of Al2O3/Ti3SiC2 composites. Nb doping can optimize the microstructure of Al2O3/Ti3SiC2 composites. Scanning electron microscopy (SEM) images showed that with the increase in Nb doping, the pores of the composites gradually decreased and the microstructure became denser. Based on X-ray diffraction (XRD) pattern analysis, it was found that Ti3SiC2 may react with Nb to form the enhanced phases Ti5Si3, TiC and Nb3Si. Therefore, with the continuous doping of Nb, more toughening phase Ti3SiC2 will be converted to the strengthening phases, leading to the sacrifice of partial fracture toughness to improve the bending strength and hardness of Al2O3/Ti3SiC2 composites.
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Metadata
Title
Dependence of Nb doping on microstructure and mechanical properties of Al2O3/Ti3SiC2 composites
Authors
Jinman Yu
Guopu Shi
Qinggang Li
Junyan Wu
Liu Zhang
Zhi Wang
Publication date
05-03-2020
Publisher
Springer US
Published in
Journal of Materials Science / Issue 17/2020
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-020-04527-4

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