Abstract: A novel method is disclosed for the preparation of a sintered porous body of a metallic or ceramic powder having a closed cell texture and a porosity as high as 95% or higher. The method comprises the steps of: preparing a foamable aqueous slurried composition containing a powder of the metallic or ceramic material, a blowing agent and a binder resin which is a water-soluble polymer capable of becoming gelled; subjecting the slurried composition to gelation of the binder resin; subjecting the gelled mass of the composition to foaming by gas-evolution from the blowing agent; and heating the thus gelled and foamed body of the composition to effect drying and sintering of the particles of the metallic or ceramic powder.

Abstract: A novel method is disclosed for the preparation of a sintered porous body of a metallic or ceramic powder having a closed cell texture and a porosity as high as 95% or higher. The method comprises the steps of: preparing a foamable aqueous slurried composition containing a powder of the metallic or ceramic material, a blowing agent and a binder resin which is a water-soluble polymer capable of becoming gelled; subjecting the slurried composition to gelation of the binder resin; subjecting the gelled mass of the composition to foaming by gas-evolution from the blowing agent; and heating the thus gelled and foamed body of the composition to effect drying and sintering of the particles of the metallic or ceramic powder.

Abstract: A material strength measuring and evaluating method for measuring and evaluating of at least one of a peel strength and a fragility breaking strength of a fragile thin film. The method includes pressing an indenter into a test object and measuring an indentation load and an indentation depth, while at the same time detecting charged particles emitted from a peel starting point or a breakage starting point, specifying a peel occurring time and a fragility breaking time when charged particles are increased, and measuring the at least one of peel strength and the fragility breaking strength.

Abstract: The present invention is formed by detecting the charged particles generated during film peeling and fragility breaking, so that it is possible to specify a peel occurring time and a fragility breaking time, with a high sensitivity and a high accuracy. In this way, it becomes possible to correctly measure the peel strength and the fragility breaking strength. The method of the invention comprises the steps of pressing an indenter into a test object and measuring an indentation load as well as an indentation depth, while at the same time detecting charged particles omitted from a peel starting point or a breakage starting point; specifying a peel occurring time and a fragility breaking time when charged particles are increased; measuring a peel strength and/or a fragility breaking strength.

Abstract: A shock absorbing device in a press is formed by having a telescopically sliding member fastened to the punch plate of the press and a stopper member fastened to the die plate of the press and placing an oil of high viscosity between the post and the outer cylinder of the telescopically sliding member. This shock absorbing device damps the unloading impact produced when the punch of the press collides with a workpiece and fractures it and, thereby, abates the noise generated from the press, the tool and the workpiece.