Patent ID: 9051844
Filing Date: 2015-06-09
Classification: C22C,F01D,F05C,F05D

Abstract:
1. A method of manufacturing a turbine wheel for a turbocharger, the method comprising: providing a nickel-based alloy having 0.01-0.2 percent in weight of carbon, 8-10 percent in weight chromium, 4-6 percent in weight aluminum, 2-4 percent in weight titanium, 1.5-2.8 percent in weight molybdenum, 10-13.5 percent in weight tungsten, 1.5-2.5 percent in weight niobium, less than or equal to 0.04 percent in weight boron, less than or equal to 0.15 percent in weight zircon, between 0.3 to 0.6 percent in weight the hafnium, and optionally lanthanum, provided that the total hafnium and lanthanum is less than or equal to 1.5 percent in weight; casting the nickel-based alloy to form a geometry of the turbine wheel; performing high temperature isostatic pressing on the turbine wheel; and forming an aluminum oxide layer along a surface of the turbine wheel.