STEEL VALVE FOR INTERNAL-COMBUSTION ENGINE

摘要

PURPOSE:To improve the abrasion resistance of the contact surface with a locker arm by forming a composite layer in matrix form into which ceramics particles are dispersed, at the top edge of the valve stem of an intake/exhaust valve for an engine. CONSTITUTION:In an exhaust valve 1 for engine which is made of steel, a composite layer 9 is formed onto the contact part with a locker arm at the upper edge part. Said composite layer 9 is made of the heat-resisting steel 7 in matrix form into which TiC particles 8 are dispersed. Said TiC particle is obtained by adding the aqueous solution of polyvinyl alcohol in 5% as bonding agent into TiC powder having an average particle size of 80mu and arranging said TiC powder into a layer form having a thickness of about 1mm except the peripheral edge part having a width of about 1.0mm at the edge surface of the valve and then drying said layer after the heating at about 110 deg.C in the atmosphere for 20min and then melting said layer in argon gas by a laser gun.