Agency of Industrial Science and Technology

Ministry of International Trade & Industry

Agency of Industrial Science and Technology Ministry of International

Shiro Sano

Hiroyoshi Takagi

Hiroshi Hayashi

A low thermal expansion cordierite ceramic is produced by combining cordierite with a zirconium compound and a phosphorus compound and sintering the resultant mixture thereby giving rise to zircon therein.

Method for manufacture of low thermal expansion cordierite ceramics

A powder composition for producing cordierite is obtained by mixing a water-soluble magnesium salt; a water-soluble aluminum salt; a silicon source selected from the group consisting of organic silicon compounds, silica, silica sol and, silica gel; and an organic solvent, adding to the resultant mixture an ammonia-alkaline solution of ammonium carbonate thereby producing a precipitate, separating the precipitate, and drying the separated precipitate.

Method for manufacture of powder composition for cordierite

A magnesia ceramic for high-frequency electric insulation is produced by using, as the principal component, magnesia and adding thereto a calcium-magnesium-phosphate and at least one member selected from the group consisting of the oxides of aluminum, silicon, beryllium and tungsten.

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Nagoya, Japan

Shiro Sano