Save money and time by purchasing a telescope mirror kit. This kit includes an 10 inch telescope mirror blank, all the silicon carbide grits, white aluminum oxide powders, gugolz pitch, and cerium oxide polish you will need to grind and polish an 10 inch telescope mirror all bundled in one spot. This will get you on a great start to building your own telescope.
Waite Research :: 15" F4.5 Telescope Mirror
The silicon carbide abrasives were replaced with Microgrit aluminum oxide, and the fine grinding preceded through 25-micron, 12-, 9-, and 5-micron grades. After each grade of abrasive is finished, I use the spherometer to get an exact measurement of the radius, and then adjust the position of the grinding tool on the mirror to move the radius in the desired direction.
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.
Boostec® Silicon Carbide - OPTOSIC - REFLECTING …
Boostec® Silicon Carbide Boostec® Silicon carbide is AN ADVANCED CERAMIC WITH MANY KEY ADVANTAGES high purity composition, with no secondary phase isotropic physical properties low density very high mechanical strength and rigidity (420 GPa)
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
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 …
Converted silicon carbide technology developments for …
Converted silicon carbide technology developments for optics Converted silicon carbide technology developments for optics Duston, Christopher; deBlonk, Brett 2007-09-13 00:00:00 ABSTRACT Silicon carbide structures fabried by converting near-net-shape graphite preforms via Chemical Vapor Conversion (CVC) phase reaction have long provided improved performance components for …
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.
Silicon Carbide is special in the way it breaks down. As it breaks down into smaller particles, the media will expose new, sharp edges. Therefore, black silicon carbide can be best used over and over, such as in a rock tuler.
Reflecting Telescope | Definition of Reflecting Telescope …
‘Unlike conventional reflecting telescopes, Herschel''s telescope mirror is being made from a novel ceramic material called silicon carbide.’ More example sentences ‘There are two main types of telescopes: refracting telescopes, which use lenses to gather the light and form an image; and reflecting telescopes, which use mirrors to accomplish the same purpose.’
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.
Rapid Stressed Mirror Polishing of Silicon Carbide …
SSG proposes the appliion of the stressed mirror polishing process to aggressively lightweighted Reaction Bonded (RB) Silicon Carbide (SiC) mirror substrates. RB SiC is > 5x more fracture tough than ULE glass, making stressed mirror polishing of rib-supported SiC mirrors viable.
Fine Ceramics in Space | Noticias | Spain
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.
Ultrastable materials investigated in depth -- ScienceDaily
Jan. 28, 2016 — Inside a massive clean room at NASA''s Goddard Space Flight Center in Greenbelt, Maryland the James Webb Space Telescope team is steadily installing the largest space telescope
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
DESIGN OF A BASIC ANGLE MONITORING SYSTEM IN SILICON CARBIDE
sintering Silicon Carbide is extremely hard, and the ma-terial must be polished to get the ﬁnal shaping and align-ment. The loions, which should be polished, are there-fore preferably well reachable and the nuer of these loions should be limited. 3.1. Main
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.
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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
Silicon carbide - Wikipedia
Silicon carbide (SiC), also known as carborundum / k ɑːr b ə ˈ r ʌ n d əm /, is a semiconductor containing silicon and carbon.It occurs in nature as the extremely rare mineral moissanite.Synthetic SiC powder has been mass-produced since 1893 for use as an abrasive..
Silicon Carbide Sanding Disc Durable Practical Grinding Polishing Hook&Loop Features: *100% brand new and high quality * M ade of premium material for durable and practical use *Made of high quality silicon carbide and waterproof sandpaper. The abrasive
Affordable, Ultra-stable CVC SiC UVOIR Telescope for …
The common need cited is a mirror technology that is lightweight, dimensionally stable, high performance, and above all else, cost effective. One of these potential future observatory missions is the Advanced Technology Large-Aperture Space Telescope (ATLAST) (Marc Postman et.al., SPIE Journal of Optical Engineering, 51(1), 011007, January 2012).
Actuated Hybrid Mirror Telescope - CORE
The mirror-shape-control actuators will be low-power, high-capacitance lead magnesium niobate electrostrictive actuators that will be eedded in the SiC structures. The mode of operation of these actuators will be such that once power was applied, they will change in length and once power was removed, they will maintain dimensional stability to nanometer precision.
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.
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.