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The Development of a Cobalt-Free Exhaust Valve Seat Insert
Technical Paper
2004-01-0502
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Generally, cobalt-contained sintered materials have mainly been applied for exhaust valve seat inserts (VSI). However, there is a trend to restrict the use of cobalt as well as lead environmental law, and cobalt is expensive. To solve these problems, a new exhaust VSI on the assumption of being cobalt and lead free, applicable for conventional engines, having good machinability, and with a reduced cost was developed. The new exhaust VSI is a material dispersed with two types of hard particles, Fe-Cr-C and Fe-Mo-Si, in the matrix of an Fe-3.5mass%Mo at the ratio of 15 mass % and 10 mass % respectively.
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Fujitsuka, H., Kawata, H., Oyanagi, M., Miyazawa, T. et al., "The Development of a Cobalt-Free Exhaust Valve Seat Insert," SAE Technical Paper 2004-01-0502, 2004, https://doi.org/10.4271/2004-01-0502.Also In
References
- Suzuki K. Ikenoue Y. Endoh H. Uchino M. “New Sintered Valve Seats for Internal Combustion LPG Engines” Modern Development in Powder Metallurgy 18-21 1988 157 170
- Kawata H. Hayashi K. Ishii K. Maki K. Ehira A. Toriumi M. “The Development of a High Speed Steel Based Sintered Material for High Performance Exhaust Valve Seat Inserts” SAE Technical Paper 980328
- Takahashi T. Kakiuchi A. Satoh K. Tominaga K. “Development of Exhaust Valve Seat Insert Material for High Performance Engines” SAE 2002-32-1817