| 摘要 |
PROBLEM TO BE SOLVED: To obtain a material with high-grade physical properties consisting of whisker-like needle crystal of new 9Al2 O3 .2B2 O3 through such a design that a group of needle crystals of 9Al2 O3 .B2 O3 each having a diameter of a specific length or less are uniformly and randomly distributed and mutually bound at least one point through sharing needle crystal constituents without the aid of any binder. SOLUTION: A mixture of aluminum oxide (or an aluminum compound capable of forming aluminum oxide when heated) and boron oxide (or a boron compound capable of forming boron oxide when heated) is prepared so as to be (9:2) to (9:6) in the molar ratio: Al2 O3 /B2 O3 , and then subjected to powder molding (compression molding) under controlled molding pressure to form a compact 0.4-2.3g/cm<3> in density (86-20% in porosity), which is then transferred in air to a hot oven where the compact is heated at 800-1,400 deg.C, thus obtaining the objective porous inorganic material consisting of whisker-like needle crystal of 9Al2 O3 .2B2 O3 each <=10μm in diameter and <10 in aspect ratio.
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