B - Operations – Transporting – 22 – F
Patent
B - Operations, Transporting
22
F
B22F 3/12 (2006.01) B22F 1/02 (2006.01) B22F 3/10 (2006.01) B23K 35/02 (2006.01) C22C 49/14 (2006.01)
Patent
CA 2122061
Methods for fabricating a sintered element from unsinterable material, utilizing the property that it will form a eutectic composition or alloy with a suitable alloying agent at a temperature which is below the plastic deformation temperature of the material. Discrete particles of the material to be sintered are coated with a thin coating of the alloying agent and are packed into position to be sintered. Then, the coated grains or wire pieces are heated so that at least the coating and the regions of the grains just below the coating are slowly raised in temperature. Diffusion regions of alloying agent into the grains of the sinterable material will occur. Further heating continues so at least the diffusion regions increase in temperature to slightly above the eutectic melting point. Localized melting of the diffusion regions occurs where the eutectic concentration is reached, and adjacent grains begin to share the localized melting regions and become mutually wet. The alloying agent continues to diffuse, and drops in concentration, so that it freezes out of the localized melting regions. The melting point of the melting regions tends to rise, and the wetted melted regions freeze to form a sintered and solid element.
Derafe Ltd.
Marks & Clerk
Powergenix Systems Inc.
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