Permeability and corrosion resistance of the porous alumina doped by Y <sub>2</sub> O <sub>3</sub> with monodispersed PMMA as pore former
Yanjun Li, Weidi Cao, Lianfeng Zhao, Donghua Liu, Jin Chen, Yanzhi Cai, Donghai Ding, Guoqing Xiao
Abstract
Abstract Porous alumina, with monodispersed PMMA as pore former and Y 2 O 3 as sintering additive, was prepared via a gel casting route with Isobam as a gelling agent. The effects of PMMA addition on its properties, including apparent porosity, bulk density, strength, permeability, and corrosion resistance to acid/alkali, were investigated. With PMMA addition increased, the apparent porosity and permeability were increased obviously, while strength and corrosion resistance to acid/alkali were deteriorated due to increased porosity. Higher firing temperature resulted in lower porosity, higher strength, lower permeability, and better corrosion resistance to acid/alkali. Coarser raw powders resulted in lower strength and higher permeability due to the coarser structure and larger pores of the fabricated samples. Because Y 2 O 3 was used as a sintering additive, and no silica was introduced, the resulting samples possess better corrosion resistance to acid and alkali, especially much better corrosion resistance to alkali, than those reported with silica introduced.