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

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

1989-03-20

1990-01-02

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making porous product

419 19, 419 27, 419 38, 419 49, 419 45, 419 44, 75228, B22F 310

Patent

active

048911828

ABSTRACT:
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.

REFERENCES:
patent: 4174364 (1979-11-01), Balosetti
patent: 4614637 (1986-09-01), Boncoeur et al.
patent: 4707184 (1987-11-01), Hashiguchi et al.

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