Joy of Mirror Making: Introduction - BBAstroDesigns
Using silicon carbide grit, the curve can be achieved in hours, albeit with heavy damage to the mirror face by the grit particles. Polishing with a pliable material like pitch (first used by Isaac Newton three hundred years ago) results in a smooth polished surface, accurate to a fraction of a wavelength of light, that is ready to begin parabolizing.
9 in. W x 11 in. L 150-Grit Medium Silicon Carbide …
60pc SILICON CARBIDE Wet / Dry SANDPAPER SHEETS 9 x 11 Very Fine Coarse Assorted $19.99 shipping: + $8.95 shipping 1500 Sandpaper 2500 Grit 42pcs 100 Dry 120 For Car Sanding Silicon Carbide
（： silicon carbide，carborundum ），SiC，，，，。 1893。，
New Process Developed for Telescope Mirror …
The new technology has only begun to scratch the surface and prove its merit among the well-budgeted beryllium and silicon carbide mirror technologies." The company is prepared to build a 0.6-m primary mirror and the complete telescope using the new technology.
Advancing aerospace materials - Company - Airbus
The answer was silicon carbide: lighter than metal or glass, it can be optically polished making it perfect for high performance lightweight mirrors. It also has excellent structural stability and thermal properties: vital for the accuracy of a telescope when temperatures in space plummet to -240°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
Optimum structural design of lightweight silicon carbide …
Optimum structural design of lightweight silicon carbide mirror in Cassegrain system Abstract: Major efforts in space optics have inspired research in high performance, low cost, very lightweight reflective telescope systems in which Cassegrain system is widely used.
12.5 Inch Telescope Mirror Kit
Save money and time by purchasing a telescope mirror kit. This kit includes an 12.5 inch telescope mirror blank, all the silicon carbide grits, white aluminum oxide powders, gugolz pitch, and cerium oxide polishyou will need to grind and polish an 12.5 inch telescope mirror all bundled in one spot. This will get you on a great start to building your own telescope.
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.
China telescope development breakthrough - Jilin, China
A silicon carbide mirror blank differs significantly from those made of other materials because it helps to increase resolution for better visual quality when installed in telescope or satellite
SBIR-17-1-S2.03-9958 | Abstract - Additively …
For both beryllium and pure silicon carbide as a mirror substrate, the cost factor and risk is quite high from a schedule perspective due to both these materials being very hard and brittle. Therefore, machining anomalies is a much higher risk than other metal mirror substrate materials.
Advanced SiC Mirror Subsystem for STSS | SBIR.gov
This Phase I effort seeks to evaluate innovative attachment concepts that will lead to the full-scale silicon carbide telescope to meet STSS requirements. A test mirror and structure will be manufactured, then tested at cryogenic conditions to determine stresses induced by attachment of the mirror …
Optical Materials: Silicon carbide mirrors benefit high …
Fabried from silicon carbide, a solid 50 mm galvanometer “x” scan mirror can provide the stiffness for high-speed rotation. The light-weighted design lowers mirror mass and inertia, but needs an optimized rib structure to meet the stiffness requirement at high scan speeds.
Why are telescope mirrors made of glass? - Astronomy …
Silicon carbide is a very popular material in newer space telescopes and is found in the optical system of too man of them for me to remeer, but here is mention of it in GAIA''s optical bench answer and in New Horizion''s LORRI telescope answer.
ESA Science & Technology - Herschel Primary Mirror …
The mirror blank is the biggest silicon carbide structure in the world and, when completed, the mirror will be the largest single-component telescope reflector ever made for use in space. Larger mirrors are planned for future missions but they will be composed of multiple, deployable sections.
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.
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The one-meter silicon carbide primary mirror was cast in the St. Petersburg facility of the Vavilov State Optical Institute (VSOI) and was sent to Moscow in June 1996 for the carbonization and siliconization phases. A hairline fracture in the silicon carbide matrix
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
Grinding a 40 cm f3 telescope mirror with 220 grit …
2017/4/11· Grinding a 40 cm f3 telescope mirror with 220 grit silicon carbide. João Carlos P Gonçalves Glass grinding with silicon carbide by hand - …
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. This is
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.
Silicon Carbide | Definition of Silicon Carbide by Oxford …
‘The team from the university''s School of Engineering are the first to manufacture these engines in a durable, heat resistant material such as ceramic or silicon carbide.’ ‘Unlike conventional reflecting telescopes, Herschel''s telescope mirror is being made from a novel ceramic material called silicon carbide.’
AOA Xinetics – Image Metrology – Northrop Grumman
Next best are single crystal silicon and CERAFORM silicon carbide which contains 30% free silicon in an alpha SiC matrix. The silicon based materials feature a Da at 5 Kelvin of 20 to 30 ppb/K. The metals, beryllium and aluminum, have the highest thermal expansivity with beryllium becoming more attractive as the temperature drops into the 77 Kelvin regime.
Microscopic surface structure of C/SiC composite mirrors for space cryogenic telescope…
silicon carbide (C/SiC) composite mirrors that have been improved for Space Infrared telescope for Cosmology and Astrophysics (SPICA) and other cooled telescopes. The C/SiC composite consists of carbon-ﬁber, silicon carbide and residual silicon. Speciﬁc