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Self Lubrication Type P/M Materials for the Lead Free Valve Seat
Technical Paper
2000-01-0395
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2000 World Congress
Language:
English
Abstract
Recent automotive engines are being produced with various types of fuel injection systems. One variation is the natural gas engine (LPG, CNG, etc. ) in which lubricating conditions become more severe than in conventional engines. Valve seats in such severe conditions require wear resistance.
At the same time, automotive components are strictly regulated to exclude hazardous elements such as lead, a well known self lubricating element.
New lead free materials have been developed for both inlet and exhaust valve seats. Some show better durability than lead infiltrated materials.
For the purpose of heat and wear resistance, a tough matrix can be obtained from several types of homogeneously distributed alloy particles. Calcium fluoride ( CaF2 ) has also been found to provide a positive effect on wear resistance and self-lubrication.
Based on simulated and actual engine test results, newly developed lead free materials have achieved greater properties than conventional and lead-containing valve seat materials.
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Authors
Topic
Citation
Sakai, M., "Self Lubrication Type P/M Materials for the Lead Free Valve Seat," SAE Technical Paper 2000-01-0395, 2000, https://doi.org/10.4271/2000-01-0395.Also In
References
- Miura H. et al “Development of Self-lubricating Wear-Resistant Materials Through MIM Process” Journal of Japan Society of Powder and Powder Metallurgy 45 5 1998
- Cheng Shi-wai Steve “The Effects of Engine Oils on intake Valve Deposits and Combustion Chamber Deposits” SAE Paper 932792 1993