Evaluation of Silicon-Nitride Ceramic Valves
| Autor: | Jiangang G. Sun, Nate S. L. Phillips, M. J. Andrews, Jeff A. Jensen, Jeremy S. Trethewey, Jianmei M. Zhang |
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| Rok vydání: | 2008 |
| Předmět: |
Marketing
Automotive engine Materials science business.industry Condensed Matter Physics Durability chemistry.chemical_compound Brittleness Reliability (semiconductor) Silicon nitride chemistry Nondestructive testing visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Composite material business Material properties |
| Zdroj: | International Journal of Applied Ceramic Technology. 5:164-180 |
| ISSN: | 1744-7402 1546-542X |
| DOI: | 10.1111/j.1744-7402.2008.02185.x |
| Popis: | Silicon-nitride ceramic valves can improve the performance of both light- and heavy-duty automotive engines because of the superior material properties of silicon nitrides over current metal alloys. However, ceramics are brittle materials that may introduce uncertainties in the reliability and durability of ceramic valves. As a result, the lifetime of ceramic valves are difficult to predict theoretically due to wide variations in the type and distribution of microstructural flaws in the material. Nondestructive evaluation (NDE) methods are therefore required to assess the quality and reliability of these valves. Because ceramic materials are optically translucent and the strength-limiting flaws are normally located near the valve surface, a laser-scatter method can be used for NDE evaluation of ceramic valves. This paper reviews the progress in the development of this NDE method and its application to inspect silicon-nitride ceramic valves at various stages of manufacturing and bench and engine tests. |
| Databáze: | OpenAIRE |
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