关键词: 氧化铝多孔陶瓷, 直接发泡法, 海泡石纤维, 力学性能, 抗侵蚀性

Abstract: Al₂O₃ particles possess strong hydrophilicity,which leads to problems including insufficient wet foam stability and poor mechanical properties when preparing pure Al₂O₃ porous ceramics by direct foaming method.Al₂O₃ porous ceramics were prepared through high-speed stirring and foaming using Al₂O₃ as the raw material,heptanoic acid as the foaming agent,and sepiolite fibers (SEPF) as the stabilizing agent,and heat treated at 1 450 ℃ for 2 h.The influence of varying SEPF additions (mass fractions of 0,0.2%,0.4%,0.6%,and 0.8%) on the properties of Al₂O₃ porous ceramics was investigated.The results indicate that as the SEPF addition increases,the cold modulus of rupture and cold compressive strength of the samples initially rise and then fall,while the corrosion depth first decreases and then increase.The sample shows the optimal comprehensive performance when the addition is 0.6%.An appropriate SEPF addition can enhance the stability of the foam slurry and create a multi-level pore structure; the orderly pore structure and dense pore walls can improve the mechanical properties and form a dense isolation layer at the corrosion interface,effectively delaying melt penetration and enhancing the corrosion resistance of the material.

Key words: alumina porous ceramics, direct foaming method, sepiolite fiber, mechanical properties, corrosion resistance