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）

作　　者：Xiao-feng WANG Yu-zhou XIE Chao-qun PENG Ri-chu WANG Dou ZHANG Yan FENG 王小锋;谢雨洲;彭超群;王日初;张斗;冯艳(中南大学粉末冶金国家重点实验室,长沙410083;中南大学材料科学与工程学院,长沙410083)

机构地区：[1]State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China [2]School of Materials Science and Engineering, Central South University, Changsha 410083, China

出　　处：《Transactions of Nonferrous Metals Society of China》2019年第8期1714-1720,共7页中国有色金属学报（英文版）

基　　金：Project(51202296) supported by the National Natural Science Foundation of China

摘　　要：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。

关 键 词：GELCASTING POLYMERIZATION porous ceramic ALUMINA 2-hydroxyethyl methacrylate (HEMA) tert-butyl alcohol (TBA) bending strength 

分 类 号：TQ174.6[化学工程—陶瓷工业]