Abstract: A method of vaporizing and removing a binder from a powder-molded product containing the binder, which method comprises:coating the greater part of the surface of said powder-molded product with a thin resin film having air-tightness thereby leasing an exposed surface portion;pressurizing the thus-coated surface portion of the pressure-molded product hydrostatically;vaporizing the binder in the power-molded product under said hydrostatic pressurization; andremoving the vaporized binder to the exterior of the power-molded product through said exposed surface portion not coated with the thin film.

Abstract: A carbon-containing mixture is obtained by collecting a dispersed phase mixture from an aerosol which has been formed by introducing a decomposable carbon compound and a decomposable metallic compound into a hot gas containing steam.Since this carbon-containing mixture is extremely high in uniformity and consists of extremely fine particles, it can afford after heat treatment a metal carbide of high quality.

Abstract: A process for producing a sialon powder, which process comprises the steps of:introducing a decomposable silicon compound, decomposable aluminum compound and a decomposable carbon compound into a steam-containing hot gas to decompose said decomposable silicon compound, aluminum compound and carbon compound in said hot gas into silicon oxide, aluminum oxide and elemental carbon, respectively, thereby producing a fine solid particle mixture consisting essentially of said silicon oxide, aluminum oxide and elemental carbon to be dispersed in said gas;collecting said fine solid particle mixture dispersed in the gas from the gas phase by a solid-gas separating technique; andcalcining the thus-obtained carbon-containing composition consisting essentially of said silicon oxide, aluminum oxide and elemental carbon, in a nitrogen containing gas atmosphere.