This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Analysis of Sintered Silicon Nitride Grinding Damage
Annotation ability available
Sector:
Language:
English
Abstract
Sintered silicon nitride, particularly in structural ceramics, has superior properties such as low weight, heat resistance, wear resistance, etc. It is already being applied to automobile engine parts such as the swirl chamber and the turbine rotor.
In recent years, the strength of silicon nitride has shown to be above 1000MPa. This has been achieved through advances in manufacturing technology such as materials powder, forming, sintering and so on. But the silicon nitride is easily damaged during grinding because it has less fracture toughness than metal. Consequently, the inherent strength of the material is not demonstrated in the actual products presently produced. It is assumed that the main cause of strength reduction is microcrack. In ordinary grinding methods, the length of microcrack has been estimated at approximately twenty micrometers by fracture mechanics analysis. But grinding damage has not yet been satisfactorily determined because microcrack evaluation methods have not been established (1)(2).
Analysis of grinding damage is of great importance in developing highly reliable ceramic parts. We have developed a new metallic solution impregnation method which can be used as a microcrack evaluation method. By this method, the influence of crack depth and residual stress distribution on the strength of the grinding surface can be analyzed.
Authors
Topic
Citation
Mizuno, S., Kobayashi, N., and Miyata, K., "Analysis of Sintered Silicon Nitride Grinding Damage," SAE Technical Paper 930163, 1993, https://doi.org/10.4271/930163.Also In
References
- Ohta “Grinding of Fine Ceramics” FC Report 8 11 457 463 1985
- Takase et al. “Surface Machining Damage and Strength of Silicon-Nitride” Toyota Technical Review 35 1 39 48 1985
- Niihara “Indentation Microfracture of Ceramics” Ceramics 20 1 12 18 1985
- Anstis G.R. et al. J.Am.Ceram.Soc. 64 9 533 538 1981
- Machine System Promotion Association “Investigation/Study on Fine Ceramics Nondestructive Testing System” 200 215 1988
- Kishimoto et al. “X-Ray Residual Stress Measurement of Sintered Si3N4” Materials 36 407 26 32 1986
- Takahashi et al. “Effects of Defect Dimensions and Notch Radius on Structural Ceramics” Journal of Ceramics Industry Association 93 4 1988