PEG对Al_2O_3陶瓷凝胶注模成型坯体表面起皮的抑制研究

Inhibitive Role of Polyethylene Glycol on the Surface-exfoliation of Alumina Ceramic Green Bodies Prepared by Gel Casting

采用凝胶注模工艺制备Al2O3陶瓷过程中,在单体和交联剂的预混溶液中加入适量的聚乙二醇(PEG),能有效克服单体聚合的氧阻聚问题,从而消除陶瓷坯体的表面起皮现象。本文研究了PEG的用量对氧化铝粉体的分散特性、浆料的粘度以及坯体表面形态等影响,并初步讨论了PEG对凝胶化过程中氧阻聚效应的抑制作用。

The inhibition of oxygen, which occurred in gel casting during the formation of polymer networks through in-situ polymerization of monomers in air, was successfully prevented by adding a proper amount of polyethylene glycol （PEG） to the pre-aqueous acrylamide solution. Thus the surfaceexfoliation of ceramic green bodies was eliminated. The effect of PEG on the dispensability of alumina powder in water, the viscosity of alumina suspension and the surface morphology of alumina green bodies were studied, and the mechanism of PEG in eliminating the oxygen inhibition was also discussed.