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《Powder Metallurgy Technology》 2006-01
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Development of Co-free exhaust valve seat lnsert for automotive engines

Akira Fujiki~(1)),Tomonori Miyazawa~(1)),Mitsushi Oyanagi~(1)),Hiroki Fujitsuka~(2)),Hideaki Kawata~(2))1)(NISSAN MOTOR CO.LTD.,6-1 Daikoku-cho Tsurumi-ku,Yokohama 230-0053,Japan)2)(HITACHI Powdered Metals CO.LTD.,520 Minoridai,Matsudo 270-2295,Japan)  
Sintered materials have been widely used for valve seat insert(VSI)for automotive engines.They have possessed high flexibility in their alloying design to increase their performance in heat and wear resistance in comparison with that of conventional wrought steel and cast alloys.Especially several high cobalt containing sintered materials are used as exhaust valve seat insert materials because(it's) high wear and heat resistant properties.Recently,the circumstance of exhaust valve seat inserts has become sever due to A/F ratio(Air/fuel ratio)of recent engines are set to leaner than that of conventional.This trend is aim to reduce exhaust gases and fuel consumption.On the other hands,the reduction use of high environmental burden materials such as cobalt has also been continually needed.And cobalt is expensive,reduce cobalt content is good for economy of these materials.This paper reports the development and the application detail of cobalt-free,lead-free and environmentally friendly exhaust valve seat insert.
【CateGory Index】: U465
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【References】
Chinese Journal Full-text Database 1 Hits
1 LI Guo-ping1,LU Ai-feng2,XU Shan-chun2,AN Jie2(1.Laiwu Vocational & Technical College,Shandong Laiwu,271100,China)(2.Laiwu Iron & Steel Co.,Ltd.,Shandong Laiwu,271105,China);Research on the Cobalt-free Powder Metallurgy Exhaust Valve Seat Insert of Engine[J];Manufacture Information Engineering of China;2009-13
【Co-references】
Chinese Journal Full-text Database 2 Hits
1 Han Fenglin (The Editorial Office of  Powder Metallurgy Technology,Beijing 100078);Development of PM Valve Seat lnsert for Automobile Engines[J];Powder Metallurgy Technology;2002-01
2 Gao Jiacheng 1) ,Wang Yong 1) ,Li Qing'an 2) ,Wang Ping 2) 1)(College of Materials,Chongqing University,Chongqing 400044, China) 2)(Chongqing Huafu Industry Co Ltd ,Chongqing 400038, China);Study on exhaust valve seat for lead-free gasoline 462Q engines[J];Powder Metallurgy Technology;2003-03
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