凝胶注模常温发泡制备氧化铝多孔陶瓷

吴海波, 袁波, 韩建燊, 王刚

中钢集团洛阳耐火材料研究院有限公司 先进耐火材料国家重点实验室 河南 洛阳 471039



摘要:

以高纯氧化铝为原料,通过起泡结合凝胶注模成型的方法制备了孔隙率为77%～85%、孔径为40～200μm的氧化铝多孔陶瓷.多孔陶瓷组成为α-Al₂O₃.多孔陶瓷的微结构可通过固含量与发泡剂加入量的改变进行调控.多孔陶瓷的耐压强度为9.40～32.50MPa,且对其断裂方式进行了研究.多孔陶瓷在1000℃下的热导率为0.80 W·(m·K)-1.

关键词:  起泡法  凝胶注模  多孔陶瓷  耐压强度  热导率

DOI：10.11951/j.issn.1005-0299.20120427

分类号:

基金项目:973项目(2010CB735810);国家自然科学基金(51002145);863计划项目(2009AA032503).



Fabrication of porous alumina ceramics by gelcasting together with foaming at room temperature

WU Hai-bo, YUAN Bo, HAN Jian-shen, WANG Gang

State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,Henan,China

Abstract:

Porous alumina ceramics with 77%～85% porosity and pore size of 40～200 μm were fabricated by foaming together with gelcasting.The composition of porous ceramics was α-Al₂O₃,and the microstructures were tailored by modulating the solid content or the quantity of foaming agent added.The compressive strengths were 9.40～32.50 MPa,and the fracture mode was studied.The thermal conductivity of porous ceramics was 0.80 W·(m·K)-1 at 1 000 ℃.

Key words:  porous ceramics  foaming  gelcasting  compressive strengths  thermal conductivity