Uniformly porous body

Details Uniformly porous body Uniformly porous body

1975-01-17

1976-06-08

Shore, Ronald J.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

291821, 291912, B22F 102, B22F 310

Patent

active

039619095

ABSTRACT:
A method of making a high temperature and stress resistant body of desired porosity in whose practice a green porous body (FIGS. 4, 5, 9, 10) of higher than the desired porosity is formed by compacting different size fractions of spherical particles (A, 23, 27 FIGS. 4, 5) or by winding fine cold-drawn wire (53 FIG. 9) or mesh of fine cold-drawn wire (73 FIG. 10) on a mandrel (51 FIG. 7; 71 FIG. 10). The green body is cemented into a rigid body and at the same time its porosity is decreased to the desired magnitude by depositing cementing material (H5 FIG. 11, 61 FIG. 9, 77 FIG. 10) in the pores (25 FIGS. 5 and 6; 55 FIG. 9) from a gas. Typically a body of tungsten is formed by reducing a tungsten halide in the pores with hydrogen.

REFERENCES:
patent: 2077873 (1937-04-01), Broselton
patent: 3049799 (1962-08-01), Breining et al.
patent: 3137995 (1964-06-01), Othmer et al.
mcGeary, R. K., "Mechanical Packing of Spherical Particles," pp. 513-522, Journal of the American Ceramic Society, vol. 44, No. 10, 1961.

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