为了获得高强度的多孔氧化铝陶瓷,研发一种基于甲基丙烯酸羟乙酯?叔丁醇(HEMA?TBA)的新型凝胶注模体系.采用流变仪、TG?DSC、SEM和弯曲强度测试等手段分别研究HEMA?TBA凝胶注模体系的聚合、坯体的热分解行为、烧结体的显微组织和力学性能.结果表明:(1)25℃ 时,适合该体系聚合的引发剂(过氧苯甲酰)的优化加入量为10 mg/mL;(2)含HEMA?TBA凝胶注模体系的氧化铝悬浮液表现为剪切变稀流变行为,且其黏度足够低至凝胶注模工艺要求;(3)多孔氧化铝试样的孔隙度为42％～56％,其相应的弯曲强度为(8±0.5)～(91±4.5)MPa.%To obtain porous alumina ceramic with high strength, a novel gelcasting system based on 2-hydroxyethyl methacrylate (HEMA) dissolved in tert-butyl alcohol (TBA) was developed. The polymerization of the HEMA?TBA gelcasting system, the thermal behavior of obtained green body, and the microstructures and mechanical properties of the sintered bodies were investigated by rheometer, TG?DSC, SEM and bending strength testing, respectively. The results show that, (1) 10 mg/mL of the initiator (benzoyl peroxide) is the optimal amount for polymerization of this gelscasting system at 25 ℃; (2) The alumina suspension of the HEMA?TBA gelcasting system showing shear-thinning behavior is sufficiently low for gelcasting process; (3) The bending strength of porous alumina ceramic samples, whose porosities range from 42％ to 56％, is from (8±0.5) to (91±4.5) MPa.
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