High precision optical finishing of lightweight silicon carbide aspheric mirror

2010 ◽  
Author(s):  
John Kong ◽  
Kevin Young
Keyword(s):  
Silicon Carbide ◽  
High Precision ◽  
Aspheric Mirror

MeV Self Ion Beam Induced Amorphisation of Silicon Carbide Surfaces and Its Effect on Their Trdbomechanical Propertdzs

1991 ◽  
Vol 235 ◽  
Author(s):  
D. K. Sood ◽  
V. C. Nath ◽  
Yang Xi
Keyword(s):  
Silicon Carbide ◽  
Raman Scattering ◽  
High Precision ◽  
Friction And Wear ◽  
Ion Beam ◽  
Steel Ball ◽  
Carbon Ions ◽  
Ion Energy ◽  
Number Of Cycles ◽  
Tribomechanical Properties

ABSTRACTAmorphisation of sintered SiC by bombardment with self (C, Si) ions has been studied. Ion doses ranged from 1×1015 to 1×1017 ions/cm2; and ion energy was varied from 0.09 to 5 MeV. Amorphisation was detected by micro-focus Raman scattering. Tribomechanical properties-friction and wear were studied with a high precision pin (steel ball) and disc (implanted) machine. Results show substantial improvements in friction and wear, which persist to a large number of cycles. Tribomechanical properties are shown to correlate with surface amorphisation and carburisation. Carbon ions are found to be much more effective than Si ions (with similar damage distributions) in reducing friction and wear.

scholarly journals High-Precision Angle-Resolved Magnetometry with Uniaxial Quantum Centers in Silicon Carbide

2015 ◽  
Vol 4 (1) ◽  
Author(s):  
D. Simin ◽  
F. Fuchs ◽  
H. Kraus ◽  
A. Sperlich ◽  
P. G. Baranov ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
High Precision

scholarly journals Fabrication of SiC Off-axis Aspheric Mirror by Using Robot Polishing

2019 ◽  
Vol 215 ◽  
pp. 09004
Author(s):  
Haitao Liu ◽  
Fengtao Yan ◽  
Wenchuan Zhao ◽  
Jieli Wu ◽  
Min Zhou
Keyword(s):  
Silicon Carbide ◽  
Industrial Robot ◽  
The Other ◽  
Surface Shape ◽  
Shape Error ◽  
Primary Mirror ◽  
Surface Polishing ◽  
Final Surface ◽  
Aspheric Mirror

Two silicon carbide (SiC) lightweight off-axis aspheric mirrors were fabricated by using robot polishing technology. One is a primary mirror with dimension 380mm×328mm, the other is a tertiary mirror with dimension 294mm×238mm. The robot polishing technology is the combination of CCOS technology and a 6-axises industrial robot. The setup of robot polishing system is discussed, and the mirror aspheric grinding, surface polishing and figuring process are reported in this paper. The final surface shape error of primary mirror is 11.4nm RMS, and the tertiary is 12.1nm RMS. The capability of off-axis aspheric mirror fabricating on robot polishing system is verified.

High-precision centering measurement of large-aperture aspheric mirror

2019 ◽  
Author(s):  
Jiayi Chen ◽  
Haichao Wang ◽  
Tengfei Huo ◽  
Cong Wang ◽  
Bin Li ◽  
...  
Keyword(s):  
High Precision ◽  
Large Aperture ◽  
Aspheric Mirror

Optical shaping of a large aspheric mirror composed of silicon carbide

2007 ◽  
Vol 74 (2) ◽  
pp. 133 ◽  
Author(s):  
Yu. P. Khimich ◽  
G. V. Evteev ◽  
D. B. Nikitin
Keyword(s):  
Silicon Carbide ◽  
Aspheric Mirror

Irradiation behavior of pyrolytic silicon carbide

1983 ◽  
Vol 41 ◽  
pp. 72-73
Author(s):  
R. J. Lauf
Keyword(s):  
Silicon Carbide ◽  
Fission Products ◽  
Thermodynamics And Kinetics ◽  
Neutron Fluences ◽  
Fuel Particles ◽  
Sic Coatings ◽  
Irradiation Behavior ◽  
Kinetics Of ◽  
Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.

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