Sprayforming bulk deposits of allotropic metal

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

C - Chemistry, Metallurgy

23

C

C23C 4/02 (2006.01) B22C 7/00 (2006.01) B22C 7/02 (2006.01) B29C 33/40 (2006.01) C23C 4/00 (2006.01) C23C 4/12 (2006.01)

Patent

CA 2278986

Method of sprayforming bulk metal deposits that replicate a master pattern: (i) casting and freezing 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.

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