ALIAJ DE NICHEL-CROM-ALUMINIU CU CONTINUT DE METALE PLATINICE

摘要

The invention relates to nickel- chromium based gamme prime alloys consisting in percentages by weight (apart from impurities) of aluminium (4 to 13.5%), chromium (trace to 6%), one or more metals of the platinum group (trace to 20% total) and balance nickel. Alloys according to the invention possess good corrosion resistance at elevated temperatures in excess of 900 DEG C. They may also contain up to 5% Hf, 6% Ti, 12% Ta, 6% Nb, 0.15% C, 0.1% B, 10% Co, 14% Mo, 14% W, 1.75% Zr, 0.25% Si and/or 3% of one or more of Sc, Y, R.E. metals. Those elements listed from Nb onward may be present wholly or partially as their oxides.