Method for producing a valve seat ring by powder metallurgy
AssigneeMahle International GmbH
InventorsHeiko Heckendorn, Alexander Mueller, Roland Scholl, Klaus Wintrich
Life of this patent
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Abstract
A method for producing a valve seat ring via powder metallurgy may include compacting a powder mixture including 4% by weight to 16% by weight particles of cobalt to form the valve seat ring. The method may also include sintering the powder mixture after compacting the powder mixture. Before compacting the powder mixture, 80% of the particles of cobalt may have a particle diameter of approximately 4.4 μm to 17.5 μm.
Claims17
A valve seat ring, produced via a powder metallurgy process comprising:
- compacting a powder mixture including 4% by weight to 16% by weight particles of cobalt to form the valve seat ring;
- and
- sintering the powder mixture after compacting the powder mixture;
- wherein 80% of the particles of cobalt have, before compacting the powder mixture, a particle diameter of approximately 4.4 μm to 17.5 μm;
- wherein the powder mixture further includes an iron-based powder including Cr;
- and
- wherein the iron-based powder is 0% by weight to 3% by weight Cr.
A tribological system, comprising a valve seat ring and a valve body configured to close a valve opening which is surrounded by the valve seat ring, wherein the valve seat ring is produced by a process including:
- compacting a powder mixture including 4% by weight to 16% by weight particles of cobalt to form the valve seat ring;
- and
- sintering the powder mixture after compacting the powder mixture;
- wherein 80% of the particles of cobalt have, before compacting the powder mixture, a particle diameter of approximately 4.4 μm to 17.5 μm;
- wherein 0% by weight to 5.5% by weight of the powder mixture is formed by at least one of bronze and brass, respectively;
- wherein the powder mixture further includes an iron-based powder including Cr;
- and
- wherein the iron-based powder is 0% by weight to 3% by weight Cr.
An internal combustion engine for a motor vehicle, comprising a cylinder head and a tribological system including a valve seat ring and a valve body configured to close a valve opening which is surrounded by the valve seat ring;
- wherein the valve opening and the valve seat ring are disposed on the cylinder head;
- wherein the valve seat ring is produced by a process including:
- compacting a powder mixture including 4% by weight to 16% by weight particles of cobalt to form the valve seat ring;
- and
- sintering the powder mixture after compacting the powder mixture;
- wherein 80% of the particles of cobalt have, before compacting the powder mixture, a particle diameter of approximately 6.5 μm to 12 μm;
- wherein the powder mixture further includes an iron-based powder including Cr;
- and
- wherein the iron-based powder is 0% by weight to 3% by weight Cr.
Dependencies are inferred from the claim text.