1. New Aerospace Technologies from EWI May 23, 2012 Brian Bishop Business Development Manager – Aerospace 614-270-7052 bbishop@ewi.org

2. Update on LPS Activities Advances in Laser Paint Stripping Stan Ream Laser Technology Leader EWI 614-688-5092 sream@ewi.org

3. Another way to scan a beam- polygon scanner by EWI and CWA - • Up to 50 m/s scan speed • All reflective optics • One moving part • Constant scan velocity across scan width • Constant velocity across scan width Rotating Polygonal Mirror Laser Beam Source EWI Scanner, Patent Pending

4. Polygon “Beta” Scanner- “COTS” availability from WTT - • More robust • Contamination resistant Protective “door” Single body component Water cooling Servo Drive Patent Pending

5. Why the polygon scanner works • Scan speed reduces flame height • Reduced flame height reduces beam interference • Reduced flame height improves effluent removal • Reduced flame height supports cleaner combustion • Reduced flame height permits better vision High speed video (approximately 300X ) with diode laser illumination

6. Need for process control- more important for shorter wavelength - • Paint thickness is not constant • Undocumented paint layers may exist • Overlap between passes cannot be assured

7. System Considerations • LPS of component parts can be relatively simple • Many off-aircraft components are candidates

8. White, Commercial Aircraft? - fiber lasers not a productive option - • Repositionable robot platform for CO2 laser • Technically feasible but not an attractive solution Laser Chiller Exhaust Filtration Controls

9. Mobile CO2 LPS Platform?- we’ll never know if we don’t ask - • Large mobile platforms are commercially available • Many questions about laser tolerance to motion Image from SwRI

10. Literally “out of the box” concept- CO2 laser pitch-catch system - • CO2 beam guided and “guarded” by multiple safety beams Yeah, probably too far out for aircraft

11. But, maybe not too far out for a tougher class of transportation- CO2 laser pitch-catch system -

12. Summary • Novel brazing approach developed for silicon carbide joining • Material has a low neutron cross section and is stable at temperatures >1200C • Forms unique composite microstructure • Preliminary reactor testing at OSURR, a fast fluence (E> 0.1 MeV) of 1E18 n/cm2, or 1E22 n/m2 • EWI process does not require high pressure • Other approaches for SiC brazing require high pressures of 30-40 MPa or more; fuel clad tubes are only 1cm in diameter and have thin wall thickness • This provides key advantage in manufacturability to other competitor processes Patent Pending: Provisional Application #61/538,409 “Method for Joining Ceramic Bodies to One Another”

13. Questions Brian Bishop Business Development Manager – Aerospace 614-270-7052 bbishop@ewi.org