Agency of Industrial Science and Technology

Shinko Kosen Kogyo Kabushiki Kaisha

Shachihata Kogyo K.k.

Sumio Nagata

Hidetoshi Ueno

Akira Kitahara

Takashi Ichikawa

Michiru Sakamoto

Shigeru Akiyama

Masao Itoh

Koji Imagawa

Kazuhide Kanaiwa

Tooru Nishikawa

Kazuo Morimoto

A process for making a porous mass of a metal of iron- or titanium-group comprises steps of forming a sinter of solvent-soluble particles, pressing in a molten metal of the iron- or titanium- group into open interstices in the sinter, and eluting the particles from the composite of the sinter and metal. Solvent-soluble magnesia particles whose surface is either covered or not with a film of boric anhydride or solvent-soluble calcia particles whose surface is either covered or not with film of calcium chloride are sintered and machined into the desired shape. The formed sinter is put in a case of a heat-insulating material that can withstand the melting temperature of a metal of iron- or titanium-group. After being heated to a given temperature together with the case, the sinter is immediately put in a metal mold where a molten metal of iron- or titanium-group is pressed into open interstices in the sinter. Then, only the particles are eluted from the sinter-metal composite by a solvent.

Process for making porous masses of iron, nickel, titanium, and other

A foamed metal which has an apparent specific gravity of from 0.2 to 0.8 and comprises an aggregate of polygonal closed cells of from 2 to 10 mm in average diameter. The foamed metal is not only light in weight, free of directionality and structurally strong but also excellent in sound-absorbing and electromagnetic shielding properties, and is useful as constructional, structural or functional material. A method for producing the foamed material comprises adding calcium as a thickening agent to molten aluminum or alloy thereof in an amount of from 0.2 to 8% by weight, followed by agitating to adjust the viscosity of the melet, then adding from 1 to 3% by weight of powdered titanium hydride as a foaming agent to the melt, and agitating the melt to effect foaming.

Foamed metal and method of producing same

The invention provides an improved method for the preparation of a porous ongy body of a metal or alloy having an open cell structure. The basic principle of the method is the pressurized casting of a melt of the metal or alloy with a preheated powder compact of an inorganic compound soluble in a solvent to fill up the pores and dissolving away the inorganic compound with a solvent after solidification of the melt. The improvement comprises forming interconnections bridging the particles in the powder compact and, different from conventional methods in which the preheating temperature is higher than the solidification temperature of the melt, preheating the powder compact at a temperature lower than the solidification temperature of the melt but higher than a critical preheating temperature defined as a function of the solidification temperature of the melt, latent heat of solidification of the melt, density of the metal or alloy, volume fraction of the inorganic compound in the powder compact under casting, specific heat of the inorganic compound and true density of the inorganic compound.

Method for the preparation of a spongy metallic body

Growing community of inventors

Tosu, Japan

Sumio Nagata