Method for isostatic or pseudo-isostatic pressing employing a surrounding casing of glass

A method for the manufacture of objects from powdered material by isostatic or pseudo-isostatic pressing, wherein

• a porous body, with open pores, is preformed from a powdered material;
• at least one layer of a powdered material is applied on the external surface of the preformed porous body by dipcoating;
• whereupon the preformed porous body is covered with a casing of glass, or a material forming glass upon heating, arranged outside and surrounding said layer;
• the casing is made impenetrable to the pressure medium, by heating, and
• the preformed body with surrounding casing is compacted and consolidated into an essentially dense body by isostatic or pseudo-isostatic pressing and sintering, wherein
• the pore system of the preformed porous body is evacuated by applying a sub-atmospheric pressure,
• the sub-atmospheric pressure is applied by means of at least one suction cup, wherein said suction cup is applied onto one or more of the external surfaces to be coated, and that
• the sub-atmospheric pressure is applied in connection with and during the dipping of the body into a slurry of powdered materials included in the layer.