The development of stacked core technology for the fabrication of deep lightweight UV-quality space mirrors

Gary W. Matthews, Robert Egerman, Steven P. Maffett, H. Philip Stahl, Ron Eng, Michael R. Effinger, Jacobus M. Oschmann, Mark Clampin, Giovanni G. Fazio, Howard A. MacEwen
2014 Space Telescopes and Instrumentation 2014: Optical, Infrared, and Millimeter Wave  
High Temp Fusion and Slumping > Posts and struts flame welded into square cell core, faying surfaces ground plano > Plano faceplates high temp fused to core, assembly slumped over firebrick form > Light weighting limited by core buckling at high temp 4 Frit Bonding > Frit is a powdered glass that devitrifies into a glass ceramic at a temp below softening point of ULE® and adheres strongly to core and faceplates > Enables much lighter weight near net shape mirrors (very little distortion during
more » ... iring) Key Lightweight Technologies Implemented for Large PMs Lightweight Fused Core > Thin plates fused into triangles then fused into core, faying surfaces ground spherical > Frit slurry applied to interfaces, faceplates added, and assy fired > Light weighting and design options limited by need to machine LW core faying surfaces 5
doi:10.1117/12.2055284 fatcat:aywtk2nijjeyfilmsup5gasoua