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    • 68. 发明专利
    • BETA ALUMINA ELECTROLYTE SINTERED MATERIAL AND MANUFACTURE THEREOF
    • JPH0757773A
    • 1995-03-03
    • JP22501693
    • 1993-08-19
    • MITSUBISHI HEAVY IND LTD
    • MIYAJI MASAKAZUNISHI TOSHIROTSURU YASUHIKO
    • C04B35/113H01M10/39
    • PURPOSE:To uniformize the composition of material, and to restrict the reaction with moisture by setting quantity of lithium, which is included in the powder at the time of sintering beta alumina electrolyte sintered material smaller than the quantity of lithium included in the beta alumina electrolyte sintered material, and sintering to form the structure of the sintered material near the outer surface finer than the inside structure of the sintered material. CONSTITUTION:Grains grow to form the rough structure as quantity of liquid phase is larger at the time of sintering beta alumina. Lithium has the work for increasing quantity of liquid phase in the case where a large quantity of lithium exists at the time of sintering beta-alumina, and generates the roughness of structure. When quantity of lithium is reduced, quantity of liquid phase at the time of sintering is reduced to enable the fining of structure. Quantity of lithium included in the powder is reduced than the quantity of lithium included in a molding to diffuse or flow the lithium near the outer surface to the powder at the time of sintering, and quantity of lithium near the outer surface of the molding is reduced than the quantity of lithium inside of the molding, and the only structure near the outer surface of the sintered material can be fined.
    • 70. 发明专利
    • PRODUCTION OF BETA-ALUMINA ELECTROLYTE
    • JPH11246267A
    • 1999-09-14
    • JP5029198
    • 1998-03-03
    • MITSUBISHI HEAVY IND LTD
    • TSURU YASUHIKOSAWADA AKIHIROYASHIMA YOSHIMI
    • C04B35/113H01M10/39
    • PROBLEM TO BE SOLVED: To stably obtain a magnesia-added β-alumina having high electric conductivity and high strength by mixing an aluminum starting raw material and a sodium starting raw material and calcining the mixture to prepare a calcined powder of β-alumina and after that, adding a magnesia starting raw material, pulverizing, mixing, and sintering after forming. SOLUTION: The calcined powder having high β"-conversion ratio is obtained by mixing the aluminum starting raw material such as aluminum oxide and the sodium starting raw material such as sodium carbonate in the molar ratio of 5-7 expressed in term of Al2 O3 /Na2 O and drying and pulverizing at need, and then calcining at 1,200-1,350 deg.C. Next, 1.5-4.5 pts.wt. magnesium starting raw material is added into 100 pts.wt. calcined powder and mixed, pulverized and then, formed into a prescribed shape, sintered at 1,540-1,650 deg.C to obtain the β-alumina sintered compact. By controlling the molar ratio of Al2 O3 /Na2 O to 5.8-6.9 and MgO content to 2-3 wt.% after sintering, 93-99% β"-conversion ratio is attained using a high purity raw material.