Layer sintered valve seat ring, process for its production, combinations therewith and their use

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.

An internal combustion engine, that is partly or completely operated with hydrogen as fuel gas, comprising:

• a valve;
• and
• a layer-sintered valve seat ring including at least two materials, the at least two materials including a function material for a tribological contact with the valve and a support material for the function material;
• wherein the support material includes:
• 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.