Effect of Sintering Aids on the Microstructure and Oxidation Behavior of Hot-Pressed Zirconium Silicate Ceramic

Abstract

Zirconium silicate (ZrSiO4) ceramic was sintered via hot pressing at 1350 °C under an applied pressure of 30 MPa for 60 min using Y2O3 or nano-ZrO2 as sintering aids. The microstructure, phase composition, and mechanical properties of ZrSiO4 were characterized by scanning electron microscopy, X-ray diffraction and three-point bending tests, respectively. The ZrSiO4 ceramic with added nano-ZrO2 exhibited the highest flexural strength, hardness, fracture toughness, and relative density (132 MPa, 8.15 GPa, 3.34 MPam1/2, and 99.3%, respectively). The effects of oxidation temperature and exposure time on the oxidation behavior of the sintered ZrSiO4 were investigated. The oxidation test results showed that the nano-ZrO2 sintering aid could effectively improve the oxidation resistance of ZrSiO4. The excellent oxidation resistance of ZrSiO4 with added nano-ZrO2 is attributed to the fact that nano-ZrO2 can restrain the decomposition of ZrSiO4 and improve the stability of ZrSiO4.

Department(s)

Materials Science and Engineering

International Standard Serial Number (ISSN)

0272-8842

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2017 Elsevier Ltd, All rights reserved.

Publication Date

01 Jan 2017

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