Valve seat rings made of basic Co or Co/Mo alloys, and production thereof
AssigneeDaimler AG
InventorsErnst Esswein, Stefan Grau, Tilmann Haug, Alexander Sagel
Life of this patent
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Abstract
A cylinder head for internal combustion engines, comprising a metallic valve seat ring that is formed by a thermally sprayed homogeneous layer made of a basic Co or Co/Mo alloy. The sum of the Co content and Mo content in the alloy exceeds 50 percent by weight while the Fe content lies below 5 percent by weight. Also disclosed is a method for thermally spraying said valve seat ring by means of an arc wire spraying process with the aid of at least two filler wires and/or composite wires, the essential Co portion in the deposited layer being delivered by the jacket of the filler wire and/or the matrix of the composite wire.
Claims14
A process for producing a thermal sprayed valve seat ring, said process comprising;
- deposition the valve seat ring by an arc wire spray process, with a Co-rich filled wire and a Cr and/or Ni rich filled or solid wire, as a homogenous layer of a Co/Mo base alloy upon a substrate material of a cylinder head,
- wherein said filled wires comprise a jacket and a filler, and wherein a substantial proportion of the Co in the deposited layer is supplied by the jacket of the filled wire.
Dependencies are inferred from the claim text.