C - Chemistry – Metallurgy – 30 – B
Patent
C - Chemistry, Metallurgy
30
B
148/1.2
C30B 21/00 (2006.01) B22D 27/04 (2006.01) C30B 11/00 (2006.01) C30B 11/14 (2006.01) C30B 17/00 (2006.01)
Patent
CA 1142840
SEED AND METHOD FOR EPITAXIAL SOLIDIFICATION ABSTRACT A seed and method for epitaxial solidification of materials, a preferred seed having at least a portion with a melting point 20-45°C depressed from that of the alloy being solidified into an article. Boron and silicon are preferably added to nickel superalloys seeds when direc- tionally solidified columnar grain and single crystal articles are formed. Improved seeds also have surface compositions which promote the dissolution of surface contamination films that interfere with epitaxy. EH-7047 - 1 -
340563
Swabey Ogilvy Renault
United Technologies Corporation
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