Sprayforming bulk deposits of allotropic metal

Details Sprayforming bulk deposits of allotropic metal Sprayforming bulk deposits of allotropic metal

1998-07-30

1999-09-07

Ryan, Patrick

Metal founding

Process

Shaping a forming surface

164 15, 264430, 264400, B22C 700, B29C 3340

Patent

active

059471794

ABSTRACT:
Method of sprayforming bulk metal deposits that replicate a master pattern: (i) casting and solidifying ceramic about a master pattern to form a spraying pattern; (ii) after removing the spraying pattern from the master pattern, heating the ceramic spraying pattern to a sustained temperature to effect an isothermal diffusion dependent microstructural transformation; (iii) while in such heated condition, thermally spraying allotropic metal particles onto the heated spraying pattern to form a deposit having a bulk thickness, the particles impacting the spraying pattern, or previously deposited particles, at a temperature above the sustained temperature of the spraying pattern; (iv) holding the deposit on the heated spraying pattern sufficiently long enough to allow the particles of the deposit to undergo a diffusion reaction that relieves internal stresses due to deposition and solidification; and (v) thereafter gradually cooling the deposit to room temperature to produce a unitary article with essentially no distortion relative to the spraying pattern.

REFERENCES:
patent: 5123970 (1992-06-01), Fang et al.
patent: 5268018 (1993-12-01), Mourer et al.
patent: 5676906 (1997-10-01), Hirata
patent: 5820810 (1998-10-01), Hirata

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