Objective
The goal of this project is to demonstrate a novel laser generated ultrasonic inspection technique for surfaces and interfaces of ceramic components and thin film ceramic coatings. This technique will provide accuracy and resolution up to 2 orders of magnitude better than techniques now in use for identifying residual stresses and defects in thin surface regions (3-10 um).
The following conclusions have been made:-
1. The change in VSAW with stress is measurable and repeatable. A change of 12m/s is seen in silicon nitride bars when a stress of 300MPA is applied. The nominal velocity is 5586m/s.
2. High, single frequency (82MHz) SAW generation was demonstrated to be a practical method, using a tone burst system. Tone burst generation is preferred to full CW as reflections from edges and ends can be avoided using time gating.
3. CW generation is possible using the moving grating method, and different frequencies can be achieved. The amplitude of the SAW generated is too low for non-contact detection.
4. VSAW and best practice Vz measurement accuracy's were demonstrated as comparable using both the CW and pulsed VSAW systems.
5. The pulsed C-MAW system can accurately measure the velocity and attenuation of SAWs propagation over short (2mm) and long (40mm) distances on ceramic substrates and is being used to characterise these materials.
6. The CW C-MAW system can accurately measure velocity and attenuation of SAWs over short (< 1mm) and long (> 50mm on spheres and cylinders) distances on samples with good surface finished (0.1 um).
The specific tasks of this project are as follows :
(i) create a technique for very accurate measurement of residual stress, microstructure, and defects in ceramic components and coating systems
(ii) demonstrate application of the technique to optimisation of selected manufacturing processes. This will involve surface acoustic wave measurements on a range of industrial samples followed by mechanical or thermal testing
(iii) demonstrate capability for in-process control, a second prototype measurement apparatus with in-process monitoring capability will also be assembled.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology mechanical engineering manufacturing engineering
- engineering and technology materials engineering coating and films
- natural sciences chemical sciences inorganic chemistry metalloids
- engineering and technology materials engineering ceramics
- natural sciences physical sciences optics laser physics
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Coordinator
BS12 7QE Filton
United Kingdom
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