The Development of a Cobalt-Free Exhaust Valve Seat Insert
2004-01-0502
03/08/2004
- Event
- Content
- 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.
- Pages
- 9
- Citation
- 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.