초록 ▼

Water soluble precursors of ceramic compounds are emulsified in an organic fluid that is subsequently heated to remove the free water from the emulsion droplets and further heated in a partial oxygen atmosphere to form a char. The carbon in the char maintains the separation between the dried droplet

Water soluble precursors of ceramic compounds are emulsified in an organic fluid that is subsequently heated to remove the free water from the emulsion droplets and further heated in a partial oxygen atmosphere to form a char. The carbon in the char maintains the separation between the dried droplet-derived particles. This char may then be heated in air to oxidize and remove the carbon, to calcine the ceramic, and to controllably produce a fine powder of spherical particles having a narrow size distribution.

대표청구항 ▼

A powder-making method of the kind including preparing an aqueous solution of precursor compounds of the desired powder product, and forming an emulsion comprised of a suspension of droplets of said aqueous solution in a water-immiscible organic fluid, wherein the improvement comprises: heating said

A powder-making method of the kind including preparing an aqueous solution of precursor compounds of the desired powder product, and forming an emulsion comprised of a suspension of droplets of said aqueous solution in a water-immiscible organic fluid, wherein the improvement comprises: heating said emulsion to evaporate and remove free water from said droplets and to evaporate and remove a substantial portion of said organic fluid to produce a dispersion of emulsion-droplet-derived particles in the remainder of said organic fluid; heating said dispersion in a reduced-oxygen atmosphere to char said remainder of said organic fluid and to form a carbon-char matrix containing said particles; and oxidizing and removing the carbon in said carbon char matrix to leave only said particles in the form of a powder.