Process dependant setting behavior of aqueous gelcast AlN slurries

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• 作者：Guo Jian ; ^{guojian686@126.com} ; Qiu Tai ^{qiutai@njut.edu.cn} ; Yang Jian ; Feng Yongbao ; Zhang Chao ; Zhang Wenpeng ; Guo Tianhao
• 关键词：Gelcasting AlN ; Gelation ; Idle time ; Flexural strength
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：May, 2012
• 卷：38
• 期：4
• 页码：2905-2911
• 文件大小：953 K

摘要

In this study, AlN powder modified to improve anti-hydrolysis property with aluminum dihydrogen phosphate and phosphoric acid by mechanical milling was applied to prepare M-AlN gelcasting slurry. The effect of various parameters such as concentration of monomer and crosslinker, amount of initiator, solid content and temperature on the idle time was discussed for low-toxic N,N-dimethylacrylamide and N,N鈥?methylenbisacrylamide (DMAA and MBAM) system. The results suggested that the idle time of M-AlN gelcasting slurries decreased with increasing concentration of monomer and crosslinker, amount of initiator, temperature and the volume fraction of M-AlN. The calculated activation energy of 52.5 vol.%M-AlN was 29.46 kJ/mol. The M-AlN green body with optimum bulk density and maximum flexural strength was obtained when the amount of APS was 1.2 wt.%(on the monomers base), polymerization temperature was 65 掳C, and polymerization time was 60 min for constant DMAA and MBAM (10 wt.%, 1 wt.%in the premix solution, respectively) in 52.5 vol.%M-AlN slurry. The bulk density of AlN sintered ceramic is greater than 3.27 g/cm³, which presents relative density value of 99.3%of theoretical.