Material for valve guides
AssigneeHitachi Powdered Metals Co., Ltd.
InventorsKatsunao Chikahata, Koichiro Hayashi
Life of this patent
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Abstract
Disclosed is a sintered alloy material for valve guides, containing: 1.5% to 4% by mass of carbon; 1% to 20% by mass of copper; 0.1% to 2% by mass of tin; 0.01% or more than 0.01% and less than 0.1% by mass of phosphorus; and an iron base. The metallographic structure of the sintered alloy material has a matrix phase composed mainly of pearlite, and a free carbon phase being dispersed in the matrix phase.
Claims9
A sintered alloy material for valve guides, comprising:
- 1.5% to 4% by mass of carbon;
- 1% to 20% by mass of copper;
- 0.1% to 2% by mass of tin;
- 0.01% or more than 0.01% and less than 0.1% by mass of phosphorus;
- and an iron base,
- and having a metallographic structure comprising:
- a matrix phase comprising pearlite;
- a free carbon phase being dispersed in the matrix phase;
- a copper-tin alloy phase dispersed in the matrix phase;
- and
- a steadite phase dispersed in the matrix phase.
A sintered alloy material for valve guides, consisting essentially of:
- 1.5% to 4% by mass of carbon;
- 1% to 20% by mass of copper;
- 0.1% to 2% by mass of tin;
- 0.01% or more than 0.01% and less than 0.1% by mass of phosphorus;
- and
- the balance iron,
- and having a metallographic structure comprising:
- a matrix phase comprising pearlite;
- and
- a free carbon phase being dispersed in the matrix phase.
A sintered alloy material for valve guides, consisting essentially of:
- 1.5% to 4% by mass of carbon;
- 1% to 20% by mass of copper;
- 0.1% to 2% by mass of tin;
- 0.01% or more than 0.01% and less than 0.1% by mass of phosphorus;
- 4% or less by mass of a solid lubricant comprising a component which is selected from the group consisting of enstatite and manganese sulfide;
- and
- the balance iron,
- and having a metallographic structure comprising:
- a matrix phase comprising pearlite;
- and
- a free carbon phase being dispersed in the matrix phase;
- and
- a phase of the solid lubricant which is dispersed in the matrix phase.
Dependencies are inferred from the claim text.