Process for producing hollow spherical particles and sponge-like

Details Process for producing hollow spherical particles and sponge-like Process for producing hollow spherical particles and sponge-like

1987-11-25

1988-10-04

Lechert, Jr., Stephen J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

419 2, 419 5, 419 6, 419 7, 419 9, 419 19, 419 23, 419 35, 419 36, 419 37, 419 64, 419 65, 419 66, 427216, 427217, 427247, 427227, 428552, 428570, 428403, B22F 310

Patent

active

047755989

ABSTRACT:
A process is described in which hollow spheres or hollow-sphere composites (moldings) having high-strength walls are produced. Additional layers are applied to metallized spherical lightweight particles having a core of foamed polymer. In order to increase the strength of the wall of the spherical particle and the strength of the molding, metallized lightweight spherical particles having a metal wall thickness of 5 to 20 microns are treated (coated) with a dispersion of particulate metal or metal oxide or particulate ceramic or refractory material, the lightweight spherical particles coated in a thickness from 15 to 500 microns are dried, the dried particles are heated to a temperature of about 400.degree. C. to effect a pyrolysis of the polymer core, and the particles are subsequently sintered at a temperature from 900.degree. to 1400.degree. C.

REFERENCES:
patent: 3975194 (1976-08-01), Farmand et al.
patent: 4013461 (1977-03-01), Elbert
patent: 4293777 (1981-11-01), Kucza et al.
patent: 4327154 (1982-04-01), Rossmann

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