silicon carbide mirror in norway

Development of the SOFIA silicon carbide secondary mirror

development of the Telescope Optics. The 352 mm Secondary Mirror is mounted on a chopping mechanism to allow avoidance of background noise during infrared observations. Stiffness associated to lightness is a major demand for such a mirror to achieve high frequency chopping. This leads to select Silicon Carbide for the mirror blank. Its

Science Database | The lightweight silicon carbide …

The lightweight silicon carbide mirror of a new type Description. One of promising materials for space telescopes mirrors is silicon carbide ceramics. Complex of unique silicon carbide ceramic physical properties (small value to the thermal expansion coefficient, high heat conductivity and high specific inflexibility) allows expecting results.

Glass grinding with silicon carbide by hand - …

14/05/2013· In this video, Bob demonstrates how to use loose grit silicon carbide to grind your glass by hand without using any machinery at all. A fairly straightforwar

Seram Coatings – THERMAL SPRAYING OF SILICON …

Seram Coatings´ product ThermaSiC enables SiC (Silicon Carbide) to be applied as a coating by thermal spraying for the first time. ThermaSiC provides superior coating performance in corrosive and abrasive environments as well as at high temperatures (up to …

Exposure to fibres, crystalline silica, silicon carbide

Exposure to fibres, crystalline silica, silicon carbide and sulphur dioxide in the norwegian silicon carbide industry. Føreland S(1), Bye E, Bakke B, Eduard W. Author information: (1)Department of Chemical and Biological Working Environment, National Institute of Occupational Health, PO Box 8149 Dep., N-0033 Oslo, Norway. solveig.foreland

Appliion of silicon carbide to synchrotron …

15/05/1984· TRW silicon carbide mirror beat exchanger design and fabriion experience A minor heat exchanger assely consists of: 1) a substrate for support of the thermal skin portion of the assely and distribution of the coolant, 2) a faceplate, 3) midplates, 4) a backplate and 5) a mounting ring. Laser mirror heat exchangers can be round, square

SiC Optics - Aperture Optical Sciences - Optical …

Silicon Carbide (SiC) is an advanced composite ceramic material developed for appliions in Aerospace, Semiconductor Lithography, and Astronomy. This unique material has the highest coination of thermal and mechanical stability of any material which can be optically polished making it perfect for high performance lightweight mirrors mounted

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China makes breakthrough in vital 4m diameter SiC …

30/07/2018· Researchers with the CAS Changchun Institute of Optics, Fine Mechanics and Physics show a silicon carbide (SiC) single mirror blank with a record-breaking diameter of 4.03 meters in Changchun City

Silicon Carbide - Silicon Carbide - Order Ceramics …

OVERVIEW of Silicon Carbide: Silicon carbide maintains its high mechanical strength up to as high temperature as 1,400. Typical appliion is part for mechanical seal ring and pump due to higher chemical corrosion resistance than other ceramics.

Silicon carbide meets optical grade standards

02/06/2008· Silicon carbide meets optical grade standards. 02 Jun 2008. Silicon carbide boasts properties such as strength and stiffness. Marie Freebody ss to Steve Hastings of optoSiC who believes that recent improvements in manufacturing techniques have enabled the material to be used as mirrors by the laser scanning industry.

Overview | Fiven

Fiven is a worldwide leading producer of silicon carbide powders. With more than a century of experience, we offer all kinds of standard SiC grains and powders. Furthermore, our R&D centers in Brazil and Norway can create products specifically designed to meet the properties requested by customers. Learn about Fiven''s products. Home. World of SiC.

Manufacturers of silicon carbide in Norway and …

157 Export shipments of silicon carbide 18 PLTS = 18 BAGS SILICON CARBIDE-SIKA BTN.NO.284920.000 HAR

silicon carbide ceramic,industrial ceramic,Gas …

The mirror image of sintered silicon carbide materials shows that under 200 ×optical microscope,crystals presents uniform distribution and size is well-proportioned after the chemical corrision. Also the biggest crystal is no more than 10um .

(PDF) Airborne Fibres in the Norwegian Silicon …

N-0315 Oslo, Norway. Received 29 June 2005; in final form 11 October 2005; published online 23 February 2006. Morphology of silicon carbide (SiC) fibres from the Norwegian SiC industry has been

SILICON CARBIDE - World Health Organization

Fig. 1.2 Atomic stacking for silicon carbide polytypes The three most common polytypes in silicon carbide viewed in the [1120] plane. From left to right: 4H-silicon carbide, 6H-silicon carbide, and 3C-silicon carbide; k and h denote crystal symmetry points that are cubic and hexagonal, respectively. From Kordina & Saddow (2006).

Fast Economical Fabriion of Silicon Carbide Mirrors

Read how silicon carbide is an excellent material for fabriing optical mirrors because it coines high hardness, high stiffness, low density, high thermal conductivity, and low coefficient of thermal expansion with corrosion resistance and a long life.

Silicon carbide │ Technical ceramics

Silicon carbide (SiC) is a high-performance ceramic material made of high-quality, non-oxide powders and can be manufactured to the specific requirements of a wide range of appliions. Due to its excellent tribological properties in coination with low weight, universal chemical resistance and ready availability, SiC is a frequently used

Silicon Carbide Optical Bench | Poco Graphite Inc

The pictured optical bench was designed to hold five silicon carbide mirrors also produced from Poco Supersic. It was machined in four subcomponents, asseled and subjected to the CVC process to produce this pure, monolithic silicon carbide structure that would be near impossible to achieve by any other silicon carbide production method.

Lung cancer incidence among Norwegian silicon …

18/05/2012· Previous studies have shown that workers in the silicon carbide (SiC) industry have an overall increased risk of lung cancer. In a Canadian study, the standardised mortality ratio of lung cancer was 1.7 (95% CI 1.1 to 2.5). 1 Cancer incidence among Norwegian SiC workers is previously studied in two follow-ups, with end points 1996 and 2005, with standardised incidence ratios (SIR) of lung

US4856887A - Lightweight silicon carbide mirror - …

A lightweight mirror comprises a silicon carbide (SiC) foam core having a bulk density of approximately five percent. The mirror further comprises two solid facesheets each of which is integrally formed upon a surface of the SiC foam core, the facesheets being comprised of SiC. Upon a machined surface of one or both of the facesheets a further layer of SiC is deposited to reinforce the SiC

INTERNATIONAL COLLABORATION FOR SILICON CARBIDE …

scope used ZerodurTM for its secondary mirror (Moun-tain 1998). Their areal densities were 180 kg/m2 and 47 kg/m2, respectively (Kendrick & Stahl, 2008). Re-cently, JWST (the James Webb Space Telescope) uti-lized Be segmented primary mirrors with 14.5 kg/m2 of areal density (Kendrick & Stahl, 2008). To reduce areal density, Silicon Carbide (SiC

Masdar Institute Solar Platform - Khalifa University

New lightweight silicon carbide (SiC) mirrors testing in collaboration with Ibiden Co., Ltd. (Japan) & Masdar. The new Silicon Carbide coated mirrors developed by IBIDEN were tested at the Solar Platform from August 2014 to Deceer 2015. The advantages of these innovative mirrors are: Lightweight and durable; High reflectivity; Maximum scratch

Silicon Carbide (SiSiC/SSiC)

Silicon carbide masters corrosion, abrasion and erosion as skillfully as it stands up to frictional wear. Components are used in chemical plants, mills, expanders and extruders or as nozzles, for example. "The variants SSiC (sintered silicon carbide) and SiSiC (silicon infiltrated silicon carbide) have established themselves.

Fine Ceramics in Space | News | Europe

16/10/2019· Corporate. Fine Ceramic Components. Kyoto/London - During Space Tech Expo 2019, will showcase, amongst other materials and components, its specializations in cordierite, silicon-infiltrated silicon carbide, alumina and zirconia materials which are well-suited for the demanding requirements of this industry. Cordierite mirror.

China develops large aperture optical mirror with …

20/08/2018· Developed by Changchun Institute of Optics, Fine Mechanics, and Physics of the Chinese Academy of Sciences, the silicon carbide aspheric optical mirror measures 1.6 tonnes. The silicon carbide

Lightweighted telescope mirrors: Outstanding properties of

Larry Stepp “Silicon Carbide Tertiary Mirror for TMT” May,17,2010. E. Tobin, M. Magida, S. Kishner and M. Krim “Design, Fabriion, and Test of a Meter-Class Reaction Bonded SiC Mirror Blank”, SPIE Vol. 2543 Davide Alfano “Spectroscopic properties of carbon fiber reinforced silicon carbide composites for

Optical Materials: Silicon carbide mirrors benefit high

01/04/2008· Silicon carbide mirrors offer an optimal solution for high-speed scanning in a 50 mm scan head. The classic galvanometer mirror is a first surface mirror of uniform substrate thickness, a solid slab design. Silicon carbide has the inherent stiffness required for high-speed scanning, but the density of the material will produce a mirror that has