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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
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机译:内燃发动机用铁基烧结合金制成的耐磨性优异的阀座插入件,以及阀座插入件和阀的组装
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摘要
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.
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