Preparation of Macroporous Ceramics Using Agar Gelcasting Foam Method
Gel casting foam is a novel method which was developed in latter 1990s for the fabrication of porous materials with regular round pores and a relatively high flexural strength.It also has the advantages of simplicity in degreasing processing and short production cycle.However,the gelating system used in this method commonly contains acrylatnide,which is toxic and sensitive to oxygen,due to which,foaming and polymerization of the substance have to be performed in an oxygen-free environment.In this work,we use agar as the gelating agent in replace of acrylatnide to prepare alumina macroporous ceramics.The effects of foaming speed,foaming time,gelating time and valeric acid on the pore diameter of the sample were investigated.Results show that the average pore diameter increasing with the foaming speed,but decreasing with the increasing foaming time.Moreover,the addition of valeric acid reduces the bubble size during foaming and increase the stability of the foams.By controlling the foaming and gelating conditions,we achieve alumina macroporous ceramics with regular round pores of over 100 μm by this method.
Gelcasing foam method Agar gel Valeric acid Direct foaming
Qun Cai Fengrui Zhai Junsheng Li
College of Science,Honghe University,Yunnan,661100,P.R.China College of Engineering,Honghe University,Yunnan 661100,P.R.China
国际会议
桂林
英文
84-87
2012-07-16（万方平台首次上网日期，不代表论文的发表时间）