Shaping and sintering porous ceramic oxide products - to obtain controlled porosity in finished articles, esp. for filters, catalyst supports etc.

摘要

Method of shaping and sintering mfd. products with determined characteristics of porosity and permeability, esp. porous tubes entirely made of Al2O3 or other high purity oxides, consists of dry or wet granulating finely powdered oxide to achieve granules having an apparent density of 40% of theoretical density and particle size 25-75 mu, adding thickeners and/or binders then shaping to a tube or similar shape by compression moulding e.g. by isostatic pressing or extrusion etc., then sintering in air or combustion gas at a temp. increasing to 1550-1780 degrees C with a period of 1 hr at max. temp. followed by cooling. Improved control over the porosity and permeability can be achieved, esp. with varying shapes.