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

Patent metadata

Field	Value
Publication number	US-11959404-B2
Application number	US-202217945973-A
Country	US
Kind code	B2
Filing date	Sep 15, 2022
Priority date	Sep 16, 2021
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

A layer-sintered valve seat ring is disclosed. The layer-sintered valve seat ring includes at least two materials including a function material for a tribological contact with an opposite runner and a support material for the function material. 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; and 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.

First claim

The invention claimed is:

1. A layer-sintered valve seat ring, comprising:
at least two materials, wherein one material is a function material for a tribological contact with an opposite runner and another material is 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;
wherein a remainder of the support material is production-related contaminations 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.

2. The layer-sintered valve seat ring according to claim 1 , wherein the support material contains:
C: 1.0 to 1.8% by weight;
Cr: 10 to 15% by weight;
Mo: 2.5 to 5% by weight;
W: 0.8 to 1.5% by weight;
Si: 0.2 to 1.8% by weight;
V: 0.4 to 1.5% by weight;
Cu: 12 to 25% by weight;
Fe: 47.8 to 73.1% by weight;
Mn: up to 0.6% by weight; and
wherein the remainder are production-related contaminations 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.

3. The layer-sintered valve seat ring according to claim 1 , wherein the support material contains:
C: 0.7 to 1.1% by weight;
Cr: 3 to 5% by weight;
Mo: 3 to 5% by weight;
W: 3.5 to 5.5% by weight;
V: 1.0 to 2.0% by weight;
Cu: 15 to 25% by weight;
Fe: 54.8 to 73.8% by weight;
Mn: up to 0.6% by weight;
Si: up to 1.0% by weight;
wherein the remainder are production-related contaminations in the form of at least one of Ni, Co, Ca, P and S, which are present in contents of <0.3% by weight each where applicable.

4. The layer-sintered valve seat ring according to claim 1 , wherein the support material contains:
C: 1.0 to 1.8% by weight;
Cr: 12 to 16% by weight;
Mo: 1 to 2.5% by weight;
W: 0.8 to 2.0% by weight;
Si: 0.2 to 1.2% by weight;
V: 0.4 to 1.5% by weight;
Cu: 12 to 25% by weight;
Fe: 49.4 to 72.6% by weight;
Mn: up to 0.6% by weight;
wherein the remainder are production-related contaminations in the form of at least one of Ni, Co, Ca, P and that are present in contents of <0.3% by weight each.

5. The layer-sintered valve seat ring according to claims 1 , wherein the function material includes:
C: 0.7 to 1.5% by weight;
Cr: 2 to 4% by weight;
Mo: 12 to 18% by weight;
W: 2 to 4% by weight;
V: 1 to 2% by weight;
Cu: 10 to 20% by weight;
Co: 6 to 14% by weight;
Fe: 34.5 to 66.3% by weight;
Mn: up to 1.0% by weight;
Si: up to 1% by weight;
wherein a reminder of the function material is production-related contaminations in the form of at least one of Ni, Ca, P and S that are present in contents of <0.3% by weight each.

6. A combination of the layer-sintered valve seat ring according to claim 1 and a valve, wherein the valve is hard-faced or nitrided.

7. A combination of the layer-sintered valve seat ring according to claim 1 and a valve, wherein the valve is composed of a nickel-based alloy or an iron-based alloy with an Ni content of 10 to 40% by weight.

8. A combination of the layer-sintered valve seat ring according to claim 1 and a cylinder head of a cast iron alloy, wherein the cast iron alloy contains lamellar graphite, vermicular graphite or spheroidal graphite, and wherein the layer-sintered valve seat ring is inserted into the cylinder head with a press fit.

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.

10. The method according to claim 9 , wherein the uniaxial pressing is carried out at a pressure in the range from 40 MPa to 140 MPa, at a temperature ranging from 12° C. to 60° C. and for a time ranging from 0.5 s to 1.8 s.

11. The method according to claim 9 , wherein the sintering is carried out at the sintering temperature for a time ranging from 10 min to 30 min.

12. The method according to claim 9 , wherein the heat-treating is carried out by tempering.

13. The method according to claim 12 , wherein the tempering is carried out by hardening at 850° C. to 950° C., oil-quenching and annealing at 510° C. to 610° C. in this order.

14. The method according to claim 9 , wherein the heat-treating is carried out by annealing.

15. The method according to claim 14 , wherein the annealing is carried out by heating at 550° C. to 620° C.

16. 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.

17. The internal combustion engine according to claim 16 , wherein the valve is hard-faced or nitride.

18. The internal combustion engine according to claim 16 , wherein the valve is composed of a nickel-based alloy or an iron-based alloy with an Ni content of 10 to 40% by weight.

19. The internal combustion engine according to claim 16 , wherein the function material includes:
C: 0.7 to 1.5% by weight;
Cr: 2 to 4% by weight;
Mo: 12 to 18% by weight;
W: 2 to 4% by weight;
V: 1 to 2% by weight;
Cu: 10 to 20% by weight;
Co: 6 to 14% by weight;
Fe: 34.5 to 66.3% by weight;
Mn: up to 1.0% by weight;
Si: up to 1% by weight; and
a reminder of the function material is production-related contaminations in the form of at least one of Ni, Ca, P and S that are present in contents of <0.3% by weight each.

20. The internal combustion engine according to claim 16 , wherein the support material contains:
C: 1.0 to 1.8% by weight;
Cr: 10 to 15% by weight;
Mo: 2.5 to 5% by weight;
W: 0.8 to 1.5% by weight;
Si: 0.2 to 1.8% by weight;
V: 0.4 to 1.5% by weight;
Cu: 12 to 25% by weight;
Fe: 47.8 to 73.1% by weight;
Mn: up to 0.6% by weight; and
wherein the remainder are production-related contaminations 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.

Assignees

• Mahle Int Gmbh

Inventors

• Gutmann Andreas
• Ortlieb Marco
• Sutter Patrick
• Wintrich Klaus

Classifications

• F01L3/02 Primary

  Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials · CPC title

• F02F1/24

  Cylinder heads · CPC title

• F01L2301/00

  Using particular materials · CPC title

• F02F2200/06

  Casting · CPC title

• F01L2820/01

  Absolute values · CPC title