Nondestructive evaluation of silicon-nitride ceramic valves from engine duration test.
In this study, we investigated impact and wear damage in silicon-nitride ceramic valves that were subjected to an engine duration test in a natural-gas engine. A high-speed automated laser-scattering system was developed for the nondestructive evaluation (NDE) of 10 SN235P silicon-nitride valves. The NDE system scans the entire valve surface and generates a two-dimensional scattering image that is used to identify location, size and relative severity of subsurface damage in the valves. NED imaging data were obtained at before and at 100 and 500 hours of the engine duration test. The NDE data were analyzed and compared with surface photomicrographs. Wear damage was found in the impact surface of all valves, expecially for exhaust valves. However, the NDE examination did not detect subsurface damage such as cracks or spalls in these engine-tested valves.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- EE
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 982603
- Report Number(s):
- ANL/NE/CP-58355; TRN: US201015%%1213
- Resource Relation:
- Conference: 31st Annual International Conference & Exposition on Advanced Ceramics & Composites; Jan. 21, 2007 - Jan. 26, 2007; Dayton Beach, FL
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Evaluation of silicon-nitride ceramic valves.
Development of nondestructive evaluation methods for ceramic coatings.