公开(公告)号：US20090232726A1

公开(公告)日：2009-09-17

申请号：US12381429

申请日：2009-03-12

Applicant: Hiroaki Yotou ,  Miho Itoh ,  Tomoya Itakura

Inventor： Hiroaki Yotou ,  Miho Itoh ,  Tomoya Itakura

IPC: C01F7/02

CPC classification number: C01F7/168 ,  B01J23/02 ,  B01J23/10 ,  B01J37/08 ,  B01J37/10 ,  B82Y30/00 ,  C01B13/366 ,  C01F7/162 ,  C01F17/0025 ,  C01P2004/64

Abstract: A method for manufacturing alumina particles having a size on the order of nanometers and an excellent heat resistance at about 1000° C. comprises providing a liquid medium containing particles made of γ-alumina or boehmite alumina hydrate and a metal component such as La, Ba, Mg or the like, and thermally treated the alumina and the metal component in the liquid medium in a pressurized condition. The thermally treated particles are dried and sintered at a temperature of from 900° C. to lower than 1200° C. to provide alumina particles which has a metal aluminate crystal phase thereon. The metal component is formed as a solid solution as a surface layer of individual alumina particles by subjecting the alumina particles and the metal component to the thermal treatment prior to sintering, so that the metal aluminate crystal phase can be formed by sintering at temperatures lower than ordinary sintering temperatures.

Abstract translation: 制造尺寸为约数量级且在约1000℃下具有优异耐热性的氧化铝颗粒的方法包括提供含有由γ-氧化铝或勃姆石氧化铝水合物制成的颗粒和诸如La，Ba的金属组分的液体介质 ，Mg等，并在加压状态下热处理液体介质中的氧化铝和金属成分。 将经热处理的颗粒干燥并在900℃至低于1200℃的温度下烧结，以提供在其上具有金属铝酸盐结晶相的氧化铝颗粒。 通过在烧结之前对氧化铝颗粒和金属组分进行热处理，将金属组分形成为单独的氧化铝颗粒的表面层的固溶体，使得金属铝酸盐结晶相可以通过在低于 普通烧结温度。