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...

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Bibliographische Detailangaben
Hauptverfasser:	OSHIGE, Hiroshi, OIKAWA, Ayato, TAKAKI, Seisuke
Format:	Patent
Sprache:	eng
Schlagworte:	ACTUATING-FLOATS ALLOYS BLASTING CHEMISTRY COCKS 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 LIGHTING MECHANICAL ENGINEERING METALLURGY 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.