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1. (WO2013117315) METHOD FOR PRODUCING A TURBINE ROTOR OF AN EXHAUST GAS TURBOCHARGER

Pub. No.:    WO/2013/117315    International Application No.:    PCT/EP2013/000338
Publication Date: Fri Aug 16 01:59:59 CEST 2013 International Filing Date: Wed Feb 06 00:59:59 CET 2013
IPC: F01D 5/02
F01D 5/28
C23C 8/08
Applicants: AUDI AG
Inventors: HENKER, Oliver
STICH, Anton
Title: METHOD FOR PRODUCING A TURBINE ROTOR OF AN EXHAUST GAS TURBOCHARGER
Abstract:
The invention relates to a method for producing a turbine rotor (1) of an exhaust gas turbocharger, wherein the turbine rotor (1) comprises a turbine wheel (2) with a hub (4) and turbine blades (5) that extend from the hub (4), and a shaft (3), said method comprising the steps of: providing a turbine wheel (2), which is made of a first material, and a shaft (3) made from a second material that is different from the first material; connecting the shaft (3) to the hub (4) of the turbine wheel (2); and forming a protective layer by applying or introducing a halogen on or in the surface of the turbine wheel (2) and subsequently heat-treating the turbine rotor (1), wherein the heat treatment is carried out in an environment having an oxygen partial pressure which is greater than a first oxygen partial pressure from which the first material is oxidized and is less than a second oxygen partial pressure from which the second material is oxidized.