Patent ID: 8844903
Filing Date: 2014-09-30
Classification: B22F,C22C,F01L

Abstract:
1. A valve seat made of an iron-based, composite sintered alloy, in which hard particles and a solid lubricant are dispersed, said solid lubricant comprising solid lubricants having different average particle sizes; at least coarse lubricant particles having an average particle size of 20-100 μm and fine lubricant particles having an average particle size of 2-10 μm, the amounts of said coarse lubricant particles and said fine lubricant particles being respectively 0.3% or more by volume, and their total amount being 10% or less by volume, wherein said hard particles are Fe—Mo—Si alloy particles having an average particle size of 20-60 μm, which comprise by mass 40-70% of Mo, 0.4-2.0% of Si, and 0.1% or less of C, the balance being Fe and inevitable impurities, and wherein the amount of said hard particles is 0.3-5% by volume.