ペタライトセラミックスの鋳込成形 : Li_2O-Al_2O_3-SiO_2系セラミックスの研究(第4報)

概要

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The firing range of petalite ceramics can be extended markedly by the addition of powdered lithia glass (Li2O 10.7, MgO 8.9, Al2O3 8.9, SiO2 71.5wt. %) to petalite powders in a weight ratio of 1:9 (M. Tashiro and T. Maki, J. Ceram. Assoc. Japan, 70, 8 (1962); M. Tashiro and T. Maki, J. Ceram. Assoc. Japan, 71, 65 (1963); T. Maki and M. Tashiro, J. Ceram. Assoc. Japan, 71, 196 (1963)). In the present study, slip preparation most feasible for this nonplastic mixture was studied. The most stable slip composition determined was petalite 90, lithia glass 10, bentonite 5, and carboxymethyl cellulose (CMC) 0.02 in weight ratio. The raw materials were ball-milled in water to the fineness of almost less than 5μ in diameter. The optimum water content was 35% (wt.) of the wet base. When the bentonite content exceeded the above value, slip-cast specimens shrunk more than 27% in volume on firing. CMC was effective not only as a floating agent but for increasing the mechanical strength of dried slip-cast specimens. The modulus of rupture of 900kg/cm2 was attained in the slip-cast specimen fired at 1250°C for one hour.
社団法人日本セラミックス協会の論文
1964-07-01