Porous alumina ceramic via gelcasting based on2-hydroxyethyl methacrylate dissolved in tert-butyl alcohol

采用基于甲基丙烯酸羟乙酯-叔丁醇的凝胶注模体系制备多孔氧化铝陶瓷（英文）

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.

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。