B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/175, 75/1.2
B22D 27/20 (2006.01) B22D 7/06 (2006.01)
Patent
CA 1111673
ABSTRACT OF THE DISCLOSURE The invention is concerned with a metal casting having a hardened surface layer formed of a casting metal and alloying elements, wherein the hardened surface layer contains grains of a refractory material uniformly distributed through- out its thickness forming inclusions of the refractory material in the hardened surface layer, the alloying elements being such as to impart to the casting metal alloy adequate toughness to retain the inclusions therein; the casting metal and alloying elements extend between the spaces defined between the grains forming the inclusions of the refractory material, and thus retain the inclusions in the surface layer. The metal casting of the invention is manufactured by preparing a foundry paste by mixing together powder alloying elements with a binder and admixing thereto a powder refractory material in combination with a flux; applying a layer of the foundry paste upon the surface of a foundry mould; drying the layer; contacting the layer with a liquor of the same flux; drying the thus formed layer, and filling the foundry mould with overheated molten casting metal such that the molten metal penetrates into the foundry paste layer to retain the grains of refractory material forming the inclusions in the formed hardened surface layer. The refractory inclusions in the metal castings of the inven- tion which are found in the hardened surface layer make it possible to increase the resistance of the castings to the destructive effects produced by hydrodynamically acting molten metal jet and thus to prolong the service life of the castings.
301552
Akhmetov Gennady S.
Mikhailov Anatoly M.
Sarlin Mikhail K.
Nauchno-Issledovatelsky I. Konstruktorsky Institut Energotekhnik
Swabey Ogilvy Renault
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