氧化铝陶瓷凝胶注模成型凝固动力学研究

凝胶注模成型(Gelcasting)是一种近净尺寸陶瓷成型工艺,它是通过高分子聚合物自由基聚合反应来实现陶瓷料浆的原位固化的。通过建立料浆温度与凝固时间的曲线,来研究陶瓷料浆的凝固动力学,是简便可行的研究方法,结果表明:"驰豫时间"可以成功地描述陶瓷料浆的凝固过程。在Al2O3陶瓷料浆Gelcasting成型工艺条件优化的基础上,制备出了气孔分布均匀的Al2O3坯体。

Solidification Kinetics Of Alumina Suspension By Gel-Casting

Gel-casting is a novel net-shape method for forming ceramic green bodies,which is based on the principle of the in situ coagulation of a powder suspension via a reaction-rate-controlled macromolecule polymerized reaction after casting.The coagulation kinetics of alumina suspension for gel-casting forming were investigated through noting the change of temperature during gelling.The experimental results indicate that the coagulation kinetics can be successfully studied by the dynamic relaxation experiments intrems of "coagulation time",which provide a convenient and practicable way to research the coagulation kinetics of ceramic suspension.After optimizing the processing conditions of the alumina nitride suspension for gel-casting forming,a green body with uniform,narrow and unimodal pore size distribution was prepared.