Patent ID: 11959404
Assignee: MAHLE INTERNATIONAL GMBH
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 8:
9. A method for producing a layer-sintered valve seat ring, comprising the steps:
producing starting material powders for a support material and a function material, the support material including:
C: 0.5 to 1.8% by weight
Cr: 3 to 16% by weight
Mo: 1 to 5% by weight
W: 0.5 to 5.5% by weight
V: 0.4 to 4.0% by weight
Cu: 12 to 25% by weight
Fe: 41.3 to 82.6% by weight
Mn: up to 0.6% by weight
Si: up to 1.8% by weight
a remainder of production-related contamination in the form of at least one of Ni, Co, Ca, P, and S that are present in contents of <0.3% by weight each;

uniaxial pressing of the starting material powders;
sintering the uniaxially pressed starting material powders under an endogas atmosphere or a nitrogen-hydrogen atmosphere at a sintering temperature in the range ranging from 1055° C. to 1152° C.; and
heat-treating the sintered material by tempering or annealing.