ホウ酸アルミニウムウイスカーの骨格構造を持つ多孔質セラミックスの作製と特性

概要

論文の詳細を見る
Porous ceramics with a skeleton structure of aluminum borate(9Al_2O_3・2B_2O_3)whiskers were in-situ synthesized by firing a compact of mixed powder comprising aluminum hydroxide, boric acid and an additive of nickel oxide at 1150-1350℃. By adjusting the compacting pressure, a porous ceramic having a porosity of about 20 to 80%, which corresponds to a whisker volume fraction of about 80 to 20%, can easily be prepared. Fine open pores remain in the porous ceramic, and the pore radius can be controlled by the compacting pressure and the sintering temperature. As a result, the porous ceramic has an average pore radius of about 0.04 to 0.81 μm. Because whiskers were strongly bonded to other whiskers, the porous ceramics exhibited very high strength, and would never cause any inhalation hazard. Flexural strength of porous ceramics increased with increasing the whisker volume fraction and the amount of NiO additive, and ranged from 21.1 MPa to 193.8 MPa for whisker volume fraction of 25 to 80%. Porous ceramic have a potential use as a reinforcement of metal matrix composites, a structural material, a heat insulating material, and a filter medium.
社団法人日本セラミックス協会の論文
1998-03-01