Gelcasting of Yb₃Al₅O₁₂ using a nontoxic water-soluble copolymer as both dispersant and gelling agent

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• 作者：Xiaofei Wang^a ; ^b ; Huimin Xiang^a ; Jiachen Liu^b ; Feng Hou^b ; Yinjie Sun^a ; Yanchun Zhou^a ; ^{yczhou@imr.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{yczhou714@gmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：C. Mechanical properties ; Yb3Al5O12 ; Gelcasting ; Rheological behavior
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：42
• 期：1
• 页码：421-427
• 全文大小：1598 K

文摘

In this paper, a nontoxic water-based copolymer of isobutylene and maleic anhydride (Isobam) is used for gelcasting of Yb₃Al₅O₁₂, which acts as both dispersant and gelling agent. The advantages of this gelcasting system are that only one additive is used, and it is easy to fully remove. Both the rheological property and gelling behavior of the ceramic slurries are investigated, and the mechanism of rheological property is disclosed. The ceramic slurry with 50 vol% solid loading and 0.4 wt% Isobam is optimized for gelcasting. Using this new and simple system, the gelcasting processing is controllable by changing the temperature. In addition, the dried green body has high strength that it can be machined without failure. The microstructures of the green and sintered bodies are homogeneous, and large defects are not observed. The bulk Yb₃Al₅O₁₂ sample sintered at 1600 °C reaches a relative density of 94% with a flexural strength of 159±7 MPa, which is comparable to that of the hot-pressed Yb₃Al₅O₁₂ material.