Heat-resistant bearing material

Abstract

A heat-resistant bearing material consisting of an austenitic iron matrix alloy should, under high temperatures, have good solid lubricant properties with a high heat resistance and a high creep resistance. To this end, an iron matrix alloy is used, containing a sufficient sulphur part for obtaining a solid lubricant action on the bearing surfaces thereof, and between 1 and 6 wt. % of at least one of the following alloy elements: tungsten (W), cobalt (Co), niobium (Nb), rhenium (Re), molybdenum (Mo), tantalium (Ta), vanadium (V), hafnium (Hf), yttrium (Y), zirconium (Zr), and/or comparably high-melting alloy elements.

1 . A heat-resistant bearing material that is an austenitic iron matrix alloy, consisting of:
 a sufficient sulfur percentage to achieve a solid lubricant action on bearing surfaces of the bearing material, and   between 1% w/w and 6% w/w of at least one or more of the melting alloy elements:   tungsten (W), cobalt (Co), niobium (Nb), rhenium (Re), molybdenum (Mo), tantalum (Ta), vanadium (V), hafnium (Hf), yttrium (Y), zirconium (Zr) and an alloy with a comparable melting point to the melting alloy elements; and   wherein the following alloy composition is included, where the individual alloy elements are each indicated in % w/w:   
     C=0.4-0.6 
     Cr=18-27 
     Nb=1.4-1.8 
     Ni=12-22 
     S=0.2-0.5 
     Si=2.9-3.2 
     Residue=Iron 
     Contaminants or unspecified alloy elements up to 3. 
   
   
       2 . The bearing material according to  claim 1 , wherein the following alloy composition is included, where the individual alloy elements are each indicated in % w/w: 
     C=0.4-0.6 
     Cr =18.5-20.5 
     Nb =1.4-1.8 
     Ni =12.5-14 
     S =0.25-0.45 
     Si=2.9-3.15 
     Residue=Iron 
     Contaminants or unspecified alloy elements up to 3. 
   
   
       3 . The bearing material according to  claim 1 , wherein the following alloy composition is included, where the individual alloy elements are each indicated in % w/w: 
     C=0.4-0.6 
     Cr=24.5-26.5 
     Nb=1.4-1.8 
     Ni=19.5-21.5 
     S=0.25-0.45 
     Si=2.9-3.15 
     Residue=Iron 
     Contaminants or unspecified alloy elements up to 3. 
   
   
       4 . The bearing material of  claim 1 , wherein a paddle bearing ring is constructed of the bearing material.