Hyundai Motor Company

Jong Dae Lim

Sang Yoon Park

Chi Hoon Choi

Sung Chul Cha

Seung Hyun Hong

Hee Sam Kang

June Ho Yang

Disclosed herein is a method of treating a composite piston pin, including: preparing the piston pin of which at least surface layer includes a composite material including a reinforcing fiber and a resin; improving roughness by processing the surface layer of the piston pin; and forming a coating layer on the surface layer processed to reduce a friction coefficient of the piston pin.

Method of treating composite piston pin and surface treated composite piston pin

A Fe-base sintered alloy for a valve seat for use in internal combustion engines, which constitutes a chemical composition of 0.4 to 2% of C, 0.5 to 5% of Cr, 5 to 15% of Mo, 0.2 to 2% of Ni, 0.4 to 2% of Co, 8 to 20% of Cu, 0.01 to 0.5% of S, and the balance Fe, wherein percentages are by weight. The Fe-base sintered alloy possesses high strength and high rigidity, and hence exhibits excellent abrasive and corrosion wear resistance properties, as well as excellent lubricity.

Fe-base sintered alloy for valve seats for use in internal combustion

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Hwaseong-si, South Korea

Jong Dae Lim