| 摘要 |
PURPOSE: To provide an aluminous sintered compact capable of enhancing strength at room temp., strength at high temp. and fracture toughness. CONSTITUTION: This aluminous sintered compact consists of alumina platy crystals 1 arranged so that they come in contact one another in the thickness direction and a dispersed phase 2 existing at the crystal boundaries of the platy crystals 1. The dispersed phase 2 is made of oxide of at least one among groups IIa, IIIa and IVa elements of the Periodic Table, Ta and Mn and/or a multiple oxide consisting of the oxide and Al2 O3 . This sintered compact is obtd. by applying uniaxial compressive stress to a sintered compact consisting of alumina crystals and a dispersed phase existing at the crystal boundaries of the alumina crystals in a heated state. The dispersed phase is made of oxide of at least one among groups IIa, IIIa and IVa elements of the Periodic Table, Ta and Mn and/or a multiple oxide consisting of the oxide and Al2 O3 . |
