Iron-based sintered alloy material for valve seat

An iron-based sintered alloy material for a valve seat having improved wear resistance and reduced opposite aggressibility to a mating valve. The iron-based sintered alloy material contains 10% to 20% by area of first hard particles and 15% to 35% by area of second hard particles dispersed in a base...

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Bibliographische Detailangaben
Hauptverfasser:	SATO KENICHI, OKITA TOMOKI, TAKAHASHI TERUO, KAKIUCHI ARATA, TAKEHANA MASAHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS BLASTING CASTING CHEMISTRY CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES ENGINE PLANTS IN GENERAL FERROUS OR NON-FERROUS ALLOYS HEATING LIGHTING MACHINES OR ENGINES IN GENERAL MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER MECHANICAL ENGINEERING METALLURGY PERFORMING OPERATIONS POWDER METALLURGY STEAM ENGINES TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	An iron-based sintered alloy material for a valve seat having improved wear resistance and reduced opposite aggressibility to a mating valve. The iron-based sintered alloy material contains 10% to 20% by area of first hard particles and 15% to 35% by area of second hard particles dispersed in a base matrix phase, the first and the second hard particles accounting for 25% to 55% by area in total. The first hard particles are composed of a cobalt-based intermetallic compound and have a size of 10 to 150 mum and a hardness of at least 500HV0.1 and less than 800HV0.1. The second hard particles are composed of a cobalt-based intermetallic compound and have a size of 10 to 150 mum and a hardness of at least 800HV0.1 and less than 1100HV0.1. Solid lubricant particles may also be dispersed in the base matrix phase.