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The Stress and Morphology Evolution of CZO Films Under Different Growth Temperature Read chapter Read first chapter

2018 | OriginalPaper | Chapter

Phase Transformation Mechanism of Self-reinforced Y-α-SiAlON Ceramic Tool Material Manipulated by Two-Step Sintering

Authors : Jing Li, Ruiming Yin

Published in: Advanced Functional Materials

Publisher: Springer Singapore

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Abstract

In this study, self-reinforced Y-α-SiAlON was prepared by two-step phase transformation using single or dual rare-earth oxide addition. The process was implemented by a two-step sintering technique. The mechanism of two-step phase transformation and microstructure evolution of Y-α-SiAlON with or without Ce2O3 addition were investigated in detail. The predominant phase of the sample after the first step (i.e., pressureless sintering at low temperature) comprised elongated β-SiAlON grains. By contrast, the majority phase of sample after the second step (i.e., gas pressure sintering at high temperature) included coarse, elongated α-SiAlON grains. The driving force for β-to-α SiAlON phase transformation and liquid viscosity decreased, whereas the amount of liquid phase increased because of Ce2O3 addition, which contributed to anisotropic growth and resulted in more elongated α-SiAlON grains. The sample co-doped with Y and Ce exhibited the best mechanical properties with fracture toughness of 7.8 MPa m1/2 and Vickers hardness of 19.81 GPa.

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Metadata
Title
Phase Transformation Mechanism of Self-reinforced Y-α-SiAlON Ceramic Tool Material Manipulated by Two-Step Sintering
Authors
Jing Li
Ruiming Yin
Copyright Year
2018
Publisher
Springer Singapore
Book
Advanced Functional Materials

Print ISBN: 978-981-13-0109-4

Electronic ISBN: 978-981-13-0110-0

Copyright Year: 2018

DOI
https://doi.org/10.1007/978-981-13-0110-0_73

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