Process for producing metallic or ceramic hollow-sphere bodies

Details Process for producing metallic or ceramic hollow-sphere bodies Process for producing metallic or ceramic hollow-sphere bodies

1988-07-12

1990-04-17

Hunt, Brooks H.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

419 35, 419 36, 427 6, 264 453, B22F 702

Patent

active

049178571

ABSTRACT:
Metallic or ceramic hollow spheres are produced by applying a solid layer to a substantially spherical particle of foamed polymer and the coated polymer cores are pyrolyzed with formation of vapor. In order to permit an economical production of the hollow spheres and a wide selection from a wide range of metallic or ceramic materials, the particles consisting of foamed polymer are treated in a state of agitation with an aqueous suspension which contains dissolved or suspended binder and metallic and/or ceramic powder particles, whereby a coating is formed on said polymer particles. The coating is dried, the polymer particles and least part of the binder are subsequently pyrolyzed at temperatures from 400.degree. to 500.degree. C. with formation of vapor while they are agitated and the resulting metallic and/or ceramic hollow spheres are sintered at temperatures from 1000.degree. to 1500.degree. C. while they are agitated.

REFERENCES:
patent: 3528809 (1970-09-01), Farnand et al.
patent: 3975194 (1976-08-01), Farnand et al.
patent: 4569821 (1986-02-01), Duperray

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