Composite cores and metal casting therewith

Details Composite cores and metal casting therewith Composite cores and metal casting therewith

B - Operations, Transporting

22

D

B22D 21/00 (2006.01) B22C 3/00 (2006.01)

Patent

CA 2206487

Beryllium alloys, particularly beryllium-aluminum alloys during melt casting, have been found to react with and corrode materials used to form cores and some molds. Selected coatings have been found which protect the core (and mold when necessary) material during casting of the molten alloys. Of particular interest are alloys of beryllium and aluminum having from about 20 to about 80% by weight beryllium. Cores are formed from metals or ceramics, particularly stainless steels or silica-based ceramics. Coatings found to be stable and to protect such cores (and molds) against the molten alloy during casting include selected oxides, borides, nitrides and cermets.

On a constaté que, durant la coulée en fusion, les alliages de béryllium, particulièrement les alliages de béryllium-aluminium, réagissent avec les matières utilisées pour former les noyaux et certains moules et qu'ils les corrodent. On a trouvé des revêtements choisis qui protègent la matière des noyaux (et du moule au besoin) durant la coulée des alliages en fusion. Sont d'un intérêt particulier les alliages de béryllium et d'aluminium ayant entre environ 20 et environ 80 % en poids de béryllium. Les noyaux sont formés de métaux ou céramiques, particulièrement des aciers inoxydables ou des céramiques à base de silice. Parmi les revêtements qui sont stables et qui protègent ces noyaux (et moules) contre l'alliage en fusion durant la coulée figurent des oxydes, des borures, des nitrures et des cermets choisis.

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