This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Development of High Strength Si3N4 Sintered Body for the Valve Systems of Automotive Engines
Annotation ability available
Sector:
Language:
English
Abstract
The high reliability silicon nitride sintered body and the mirror finish grinding machining technique have been developed, which improved fuel efficiency by reducing weight and friction loss of the valve systems. This ceramics, consists of finer grains (mean grain size:1-3μm) has high strength (σ 3b=1600MPa) and high Weibull modulus (m>20).
In the case of motoring test by using this ceramics as the cam follower of the valve systems, it has a durability of more than 10,000rpm., which is approx. 30% higher than that of conventional silicone nitride, against the impact load to which the cam followers were subjected at occurrence of valve bouncing.
Authors
Citation
Nishioka, T., Matsunuma, K., Yamamoto, T., Yamakawa, A. et al., "Development of High Strength Si3N4 Sintered Body for the Valve Systems of Automotive Engines," SAE Technical Paper 920384, 1992, https://doi.org/10.4271/920384.Also In
References
- SAE Paper No. 880441 “Ceramic Valve Train Components,” Updike S.H. Nagle P.D.
- SAE Paper No. 880670 “Ceramic Valve Analysis, Reliability and Test Results,” Kabat D.M. Garwin I.J. Hartsock D.L.
- SAE Paper No. 890175 “Si3N4 Ceramic Valves for Internal Combustion Engines,” Hori Y. Miyakawa Y. Asami S. Kajihara T.
- Powder Metallurgy International “Powder Characteristics and Sintering Behavior of Si3N4-Powders,” 18 25 32 1986 Wotting G. Ziegler G.
- Sumitomo Electric Technical Review “Development of a High-Strength Si3N4 Sintered Body,” 29 262 269 1990 Nishioka T. Matsunuma K. Kuwagaki Y. Takano Y. Higuchi M. Honda M. Miyake M.
- Yogyo-Kyokai-Shi “Behavior of Mirror-Like Region of Sintered Si3N4 under Rotary Bending,” 95 472 475 1987 Ko H.N.
- Proceedings of 6th ICPE “Prevention of Thermomechanical Cracking in Fine Grinding of Ceramics,” Tanaka Y. Nishioka T. Hwan P.J.