Valve seat insert excellent in wear resistance made of iron-base sintered alloy for internal combustion engines, and assembly of valve seat insert and valve

Valve seat insert excellent in wear resistance made of iron-base sintered alloy for internal combustion engines, and assembly of valve seat insert and valve

A valve seat insert made of an iron-base sintered alloy is configured to have a structure in which the base matrix phase is a fine carbide precipitation phase in which a fine carbide being 10 μm or less in size is precipitated and which has a hardness of 550 HV or more in Vickers hardness; and in th...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Oshige, Hiroshi, Takaki, Seisuke, Oikawa, Ayato
Format: Patent
Sprache:eng
Schlagworte:
ACTUATING-FLOATS
ALLOYS
BLASTING
CHEMISTRY
COCKS
COMBUSTION ENGINES
DEVICES FOR VENTING OR AERATING
ENGINEERING ELEMENTS AND UNITS
FERROUS OR NON-FERROUS ALLOYS
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
METALLURGY
SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF
TAPS
THERMAL INSULATION IN GENERAL
TREATMENT OF ALLOYS OR NON-FERROUS METALS
VALVES
WEAPONS
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Beschreibung
Zusammenfassung:A valve seat insert made of an iron-base sintered alloy is configured to have a structure in which the base matrix phase is a fine carbide precipitation phase in which a fine carbide being 10 μm or less in size is precipitated and which has a hardness of 550 HV or more in Vickers hardness; and in the base matrix phase, hard-particles having a hardness of 650-1200 HV in Vickers hardness are dispersed in an area percentage of 20-40%, a diffusional phase is formed in an area percentage of more than 0% and not more than 5%, and solid-lubricant particles are dispersed in an area percentage of 0-5%. Even if a valve having a high face hardness of 400 HV or more, or 600 HV or more is used, a facing valve seat insert wears only slightly, improving valve train durability.