| 摘要 |
PURPOSE:To make mean particle size, and dispersion of particle size and shape smaller and to make dispersion of a sintering flux uniform by calcining a powder mixture comprising aluminum hydroxide powder, carbon powder, and powder of alkaline earth or rare earth compd. in N2-contg. nonoxidizing atmosphere. CONSTITUTION:Aluminum hydroxide powder, carbon powder or powder of a material generating carbon powder at high temp. (e.g. paraffinic compd., novolak, etc.) are mixed with at least one of alkaline earth compds. and rare earth compds. Obtd. mixture is calcined at ca. 1,300-1,850 deg.C in N2-contg. nonoxidizing atmosphere. Preferred proportion of the above described components per 1pt.wt. aluminum hydroxide powder is 0.2-2.0pts.wt. carbon powder and 0.005-1.0pts.wt. powder of the third component. Suitable third components are carbonates, oxides, nitrides, borates, or halides. |
