Thin film metallic glass broad-spectrum mirror coatings …
The co-sputtering of Al 90 Y 5 Ni 5 (at.%) with pure Zr and Zr 44 Cu 40 Ag 8 Al 8 (at.%) alloy compositions were selected to apply thin film mirror coatings by PVD via magnetron sputtering on silicon carbide substrates. The Zr 44 Cu 40 Ag 8 Al 8 (at.%) alloy composition has excellent glass forming ability, relatively high hardness and thermal stability.
Stellafane ATM: Materials & Tools
Mirror Blank This is the focus of all your work - you will turn this flat piece of glass into an accurate parabolic telescope mirror. We recommend a full thickness Pyrex blank for mirrors up to to 12" in size. Full-thickness means the diameter to thickness ratio is 6:1 (i
How to Build a Telescope | eDailyStar
Repeat the process using finer abrasives. When the silicon carbide reaches 500 grit, swap to aluminum oxide. Keep checking the focal length of the mirror while grinding. Polish it! Now you need to start the polishing process. Firstly, cover the mirror in the rouge.
SUBSTRATE MADE OF AN ALUMINUM-SILICON ALLOY …
7/3/2013· 1. A substrate comprising an aluminium-silicon alloy or crystalline silicon and a polishable layer, which layer consists of amorphous silicon, microcrystalline silicon, silicon carbide, silicon nitride, titanium nitride, aluminium oxide, zirconium oxide, chromium and/or
3D Printed Silicon Carbide Scalable to Meter-Class Segments for …
13/11/2019· class silicon carbide primary mirror substrate suitable for GHAPS, and is traceability to future missions that require large mirrors. Print four OAP parts and then AM to make a monolith primary mirror at quarter scale.
FSM Mirrors - OPTOSIC - REFLECTING PERFORMANCE
FSM Mirrors FSM Mirrors optoSiC offers standard and customized SiC Fast Steering Mirrors (FSM) from 25,4mm to 300mm diameter. A wide range of mount solutions allows the user to replace the standard low performance mirrors with SiC high-end mirrors that
Open Access proceedings Journal of Physics: Conference series
material for space telescope mirror . However, the two-phase structure of the silicon carbide material causes the surface to be less dense than the glass material, and the high hardness leads to poor workability. Therefore, the silicon carbide mirror
Silicon carbide | Safran Reosc
Silicon Carbide is today more and more used for advanced space payloads and other demanding appliions thanks to its exceptional properties or high specific stiffness (E/r) and high thermal stability to transients (D/a). Through the years, Safran Reosc developed
Advantages of Silicon Carbide Telescopes for Small Satellite …
Optical Telescope Asselies (OTAs) implemented in silicon carbide (SiC) provide performance advantages for space appliions but have been predominately implemented in the governmentsector.Anewgenerationof lightweightandthermally-stabledesignsis
Stratospheric Observatory for Infrared Astronomy - …
The secondary silicon carbide-based mirror mechanism was manufactured by the Swiss Center for Electronics and Microtechnology (CSEM). A reflective surface was applied to the mirror at a facility in Louisiana but the consortium now maintains a mirror coating facility in Moffett Field , allowing for fast recoating of the primary mirror, a process that is expected to be required 1–2 times per year.
POCO GRAPHITE, INC. | SBIR.gov
In previous work, Silicon carbide (SiC) mirrors have demonstrated excellent optical performance and SiC mirror fabriion processes are well known. However, for maximum optical system performance it
Our expertise in sintered silicon carbide (Boostec® SiC) is a pioneer technology, enabling us to contribute to exploration of the Universe. BOOSTEC® SIC Reaching the highly demanding requirements lead the engineers to design mechanically and thermally ultra-stable space optics .
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Telescope Making Supplies
Silicon carbide is an extremely sharp, synthetic abrasive which approaches the diamond in hardness. It is made by mixing finely ground petroleum coke with pure glass sand. The mixture is loaded into a crucible and heated by electric arc to temperatures in excess of 2000°C.
Silicon Carbide Optical Telescopes in ''Small Satellite'' Constellations
Silicon Carbide (Sic) has been space-proven in "large 1 Aperture Optical Sciences Inc., Durham, CT 06422 3. Process Baseline Baseline Sic Mirror Process th e We have analyzed Sic mirror production costs satellite" programs for both optical and structural
Foam-core mirrors architecture by Ultramet
Silicon carbide foam-based mirror, 10″ diameter, after polishing Contact an Expert Silicon Elemental silicon is an excellent mirror material given its outstanding polishability and, as can be seen in the following table, its extremely low density and outstanding
New Process Developed for Telescope Mirror …
The casting for the mirror is anasil, an aluminum alloy that contains about 22 percent silicon. The electroless nickel surface coating matches Vanasil''s coefficient of thermal expansion to within 5 percent. Advanced Optical produced a 13.5-kg/m 2, 6-in.-diameter mirror that is flat to 1 …
Telescope mirrors successfully lose weight Repliing mirrors with graphite-fiber-reinforced composites keeps them thin. Peter Chen A new generation of extremely lightweight Earth-, space-, or Moon-based telescopes may be possible with a composite-mirror
Jet Propulsion Laboratory Herschel Mission Spacecraft …
The mirror is made of silicon carbide, a lightweight ceramic material resistant to stress, fatigue, and extreme temperatures. It can be polished as if it were glass, deviating from perfect smoothness by no more than one micron - a requirement to avoid distorting the images it receives.
Poco Graphite Inc. 10/27/04 Page 1 of 7 Executive Summary Pictorial of Mirror Segments The “Fabriion of Silicon Carbide Prototype Mirror Segments for Thirty-Meter Telescope” represents the first step forward of an integrated AURA program to produce cost
(PDF) A Φ 3.5 M SiC telescope for Herschel mission
The Herschel Space telescope, using silicon carbide technology will be the largest space imagery Hubble Space Telescope primary mirror mass is about 900 kg for a diameter 2.4 m During previous
Silicon Carbide Optics for Space Situational Awareness and …
Silicon Carbide Optics for Space Situational Awareness and Responsive Space Needs Joseph Robichaud, Jim Green, Dan ropa, Brian Rider, Chris Ullathorne L-3 Communiions, SSG – Tinsley, Inc. 65 Jonspin Rd, Wilmington, MA 01887 1. ABSTRACT
Safran Reosc wins fifth contract in a row for ESO’s …
The ELT will be the most powerful telescope ever built. The M5 mirror for the ELT is a flat elliptical silicon carbide mirror measuring 2.70 by 2.20 meters. It will be the world''s largest mirror with optical precision in the 10 nanometer class built to date.
Fine Ceramics in Space | News | Europe
Silicon infiltrated silicon carbide ’s silicon-infiltrated silicon carbide (SiSiC) and its manufacturing and joining technologies allow the monolithic production of intrie, fine-detailed and complex components in a large-scaled format up to 1 m x 1 m x 650 mm, and in near future even larger.
Waite Research :: 20" F3.5 Telescope Mirror
The fabriion of this 20" F3.5 telescope mirror was a little unusual. In almost all cases, I purchase mirror blanks that are "pre-generated" at the glass fab. That means that they grind the rough curve into the mirror''s face before I receive the glass.