Processing of Alumina Ceramics with Ultrahigh Porosity by Composite Poring Mechanisms
Alumina ceramics with ultrahigh porosity were fabricated by composite poring mechanisms of template and foaming.Light-weight polymer balls as solid template were added into the alumina slurry foamed with surfactants,which was solidified by gelcasting.The porosity was accurately tailored between 84.9 % to 90.4 % by changing the quantities of the added balls and foaming agent.The pores have two sizes:big pores of 1~2 mm due to balls and small pores of 100~200 μm due to bubbles.The compressive strengths of porous ceramics were 2~6 MPa.The thermal conductivity was 0.28 W·m-1·K-1 at 1000 ℃ for ceramics with the 90.4 % porosity.The material can be used as high-temperature heat insulators to save energy.
WU Haibo WANG Gang LI Hongxia YUAN Bo
State Key Laboratory of Advanced Refractories, Sinosteel Luoyang Institute of Refractories Research Co., Ltd, Luoyang, Henan, China
国际会议
The 6th International Symposium on Refractories (第六届国际耐火材料会议)
郑州
英文
352-354
2012-10-18（万方平台首次上网日期，不代表论文的发表时间）