Wear-resistant sintered ferrous alloy for valve seat

A wear-resistant, sintered, ferrous alloy, for use as valve seat, comprises an iron-based matrix with a sorbite or pearlite structure, and two types of hard particles (A and B). The matrix comprises (wt.%): 0.5-1.5 C, 0.5-3 Ni, 0.5-2 Mo, 0.1-8 Co, 0.05-1 Mn and the balance Fe, and has a Vickers hard...

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Bibliographische Detailangaben
Hauptverfasser:	ITO, KOZO, TAKANO, YOSHISHIGE
Format:	Patent
Sprache:	eng ; fre ; ger
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:	A wear-resistant, sintered, ferrous alloy, for use as valve seat, comprises an iron-based matrix with a sorbite or pearlite structure, and two types of hard particles (A and B). The matrix comprises (wt.%): 0.5-1.5 C, 0.5-3 Ni, 0.5-2 Mo, 0.1-8 Co, 0.05-1 Mn and the balance Fe, and has a Vickers hardness of 300-450. Hard particles (A) comprise (wt.%): 1.5-2.5C, 38-45 Cr, 18-30 W, 5-15 Co, 0.5-3 Mo, 0.03-0.5 Ti and the balance Fe, and have an average particle dia. of 30-80 microns. Hard particles (B) comprise (wt.%): 60-70 Mo and 0.5-2 Si, balance Fe, and have an average particle dia. of 30-80 microns. Particles A and B are uniformly dispersed in the matrix, and constitute 10-25 wt.% of the alloy.