May 23, 2012 New Aerospace Technologies from EWI Brian Bishop Business Development Manager – Aerospace

Update on LPS Activities Advances in Laser Paint Stripping Stan Ream Laser Technology Leader EWI

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 EWI Scanner, Patent Pending Rotating Polygonal Mirror Laser Beam Source

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

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

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

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

White, Commercial Aircraft? - fiber lasers not a productive option -  Repositionable robot platform for CO 2 laser  Technically feasible but not an attractive solution Laser Chiller Exhaust Filtration Controls

Mobile CO 2 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

Literally “out of the box” concept - CO2 laser pitch-catch system -  CO 2 beam guided and “guarded” by multiple safety beams Yeah, probably too far out for aircraft

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

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 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”

Questions Brian Bishop Business Development Manager – Aerospace