An improved manufacture of thin sheets or plates of heat-treated material suitable for the dielectrics of capacitors and for other purposes

摘要

A thin cellulose paper sheet is loaded with a high proportion of powdered titania, magnesium or barium titanate, heated first under oxidizing conditions to burn off the cellulose, and then at a higher temperature to sinter the powder and form a sheet.ALSO:A thin cellulose paper sheet is loaded with a high proportion of a powder which can be softened and sintered at a temperature above that at which cellulose is destroyed and is heated first under oxidizing condition to burn off the cellulose and then at a higher temperature to sinter the powder and form the sheet. Temporary binders e.g. starch, dextrin or gelatine may be added to the cellulose pulp, and fluxes may be added to aid sintering. Specified powders are magnesium and barium titanate, titania, glass (alone or mixed with dielectric materials) powdered metals, silicon carbide and a mixture of carbon, silica and/or silicates p from which resistors are obtained. Preferably the powder exceeds 90 per cent. and in examples is 98 per cent. cellulose 1 and bentonite (as a plasticizer) 1 per cent.