Effect of sintering aids on the microstructure and oxidation behavior of hot-pressed zirconium silicate ceramic

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• 作者：Shifeng Huang^a ; ^b ; Qinggang Li^a ; ^c ; ^{mse_liqg@ujn.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Zhi Wang^a ; Xin Cheng^a ; ^b ; ^{chengxin@ujn.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Haiming Wen^d ; ^e
• 关键词：A. Structural composites ; B. Mechanical properties ; D. Scanning electron microscopy (SEM) ; E. Oxidation behavior
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：875-879
• 全文大小：959 K

文摘

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 MPam^1/2, 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.