【摘要】 凝胶注模成型技术由于使用了具有神经毒性的单体-丙烯酰胺在一定程度上限制了其在工业上的应用.本实验利用低毒的甲基丙烯酸羟乙酯凝胶注模成型Al2O3,研究了在该体系下低粘度高固相体积分数浓悬浮体的流变性及其固化过程.对比研究了JN281和柠檬酸铵两种分散剂对Al2O3浆料流变特性的影响,结果表明:对于该新体系.JN281比常用的柠檬酸铵更有效.加入适量.JN281可得到低粘度的高固相含量(≥50％)的陶瓷浆料.由新体系凝胶注模得到的素坯表面光滑,强度可达18MPa,SEM照片显示素坯具有均匀的显微结构,最终可烧结出均匀致密内部无明显缺陷的陶瓷部件.更多还原

【Abstract】 The industrialization of gelcasting technique based on the acrylamide system has been prevented to some extent because acrylamide is a neurotoxin monomer. In this paper another gelcasting based on the polymerization of low-toxicity 2-hydroxyethyl methacrylate (HEMA) was successfully developed. The rheological properties of alumina suspensions with two dispersants, JN281 and tri-ammonium citrite (TAC), in the new system were compared. The results show that JN281 is more effective for the new system than the frequently used TAC. High solids loading ceramic suspension with low viscosity can be prepared by addition of JN281. The green bodies made through the new system have smooth surface with a dried green strength of 18MPa. The SEM photos also indicate that the green bodies have a homogeneous microscopic structure. Dense complex-shape ceramic parts were successfully produced through the new gelcasting system.更多还原