Short carbon-fiber-reinforced ceramic -- Cesic -- for optomechanical applications

Kroedel, Matthias; Kutter, G. S.; Deyerler, Michael; Pailer, Norbert M.

doi:10.1117/12.482164

Cited by 7 publications

(6 citation statements)

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“…Reportedly, the CVD-SiC coating is one of the most promising materials for the coating of C/SiC composites, because it is the only material which has been found which the surface roughness can be be polished to around 0.3nm [5] , however, the application of CVD is limited because of the high cost and long cycles of such method and the thermal mismatch between coatings and the basement [6] . By contrast, slurry method and tape-casting method have the advantages of easy operation and low cost, but the coatings formed by both methods cannot be polished to less than 1 nm as reported by Krödel and Song [1,7] . At present, the preparation of optical coatings with high performance as well as low-cost is still a challenge.…”

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confidence: 99%

“…carbide (C/SiC) composites have been considered in view of their outstanding performance, including the low specific density (2.65g/cm 3 ), low coefficient of thermal expansion (CTE: 2×10 -6 ·K -1 at room temperature and near zero bellow 100 K), high thermal conductivity (~125W/mK), high stiffness (220GPa) and bending strength (160MPa), very high chemical corrosion resistance, etc [1][2][3][4] . However, the short carbon fiber could be oxidized during the optical process, resulting in the roughness of the C/SiC composites (~60nm) cannot meet the demand of high optical performances.…”

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confidence: 99%

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Si/SiC optical coatings for C/SiC composites via gel-casting and gas silicon infiltration: Effects of carbon black content

Huang

Liu

Zhang

et al. 2017

Journal of Alloys and Compounds

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The dense Si/SiC coatings are fabricated by means of gel-casting (GC) and gas silicon infiltration (GSI) for the first time, using carbon black and α-SiC as raw materials. The influences of the carbon black content on the properties of the coating samples have been investigated. Resultsshow that, with the increase of the carbon black content, the viscosity of the slurry increase dramatically, the density and the porosity are closer to theoretical results, leading to the higher density after GSI. And the β-SiC content increases as well as the Si content decreases, resulting in the increase of the mechanical and the thermal matching properties. It is also worth noting that the roughness of the coating of υ160mm comes to 0.57nm after polished. The study highlights that the combined application of the GC and the GSI processes can produce high-quality Si/SiC coatings that are suitable in the space optical applications.

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confidence: 99%

Si/SiC optical coatings for C/SiC composites via gel-casting and gas silicon infiltration: Effects of carbon black content

Huang

Liu

Zhang

et al. 2017

Journal of Alloys and Compounds

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“…Subsequently, when LSI is performed the Pg. 8 of 13 joint is reaction bonded, with the joint strength being roughly equal to the bulk strength [5].…”

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confidence: 99%

Advanced CSiC Composites for High-temperature Nuclear Heat Transport with Helium, Molten Salts, and Sulphur-iodine Thermochemical Hydrogen Process Fluids

Peterson¹,

Forsberg

Pickard

2004

Nuclear Science

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This paper discusses the use of liquid-silicon-impregnated (LSI) carbon-carbon composites for the development of compact and inexpensive heat exchangers, piping, vessels and pumps capable of operating in the temperature range of 800 to 1100°C with high-pressure helium, molten fluoride salts, and process fluids for sulfur-iodine thermochemical hydrogen production. LSI composites have several potentially attractive features, including ability to maintain nearly full mechanical strength to temperatures approaching 1400°C, inexpensive and commercially available fabrication materials, and the capability for simple forming, machining and joining of carbon-carbon performs, which permits the fabrication of highly complex component geometries. In the near term, these materials may prove to be attractive for use with a molten-salt intermediate loop for the demonstration of hydrogen production with a gas-cooled high temperature reactor. In the longer term, these materials could be attractive for use with the moltensalt cooled Advanced High Temperature Reactor, molten salt reactors, and fusion power plants.

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“…It is suitable for space structure manufacture taking its good characteristics into account. [3] Its material parameters are listed below: Density 2.65E-6 Kg/ mm3 Poisson ratio 0.17 Elastic modulus 249 GPa The total weight of the initial design is 19.58Kg. The spectrograph is joined into a single unit and mounted to the Optical Bench (OB) bottom base.…”

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confidence: 99%

Optimization of a space spectrograph main frame and frequency response analysis of the frame

2009

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A space spectrograph main structure is optimized and examined in order to satisfy the space operational needs.The space spectrograph will be transported into its operational orbit by the launch vehicle and it will undergo dynamic environment in the spacecraft injection period. The unexpected shocks may cause declination of observation accuracy and even equipment damages. The main frame is one of the most important parts because its mechanical performance has great influence on the operational life of the spectrograph, accuracy of observation, etc.For the reason of cost reduction and stability confirming, lower weight and higher structure stiffness of the frame are simultaneously required. Structure optimization was conducted considering the initial design modal analysis results.The base modal frequency raised 10.34% while the whole weight lowered 8.63% compared to the initial design.The purpose of this study is to analyze the new design of main frame mechanical properties and verify whether it can satisfy strict optical demands under the dynamic impact during spacecraft injection. For realizing and forecasting the frequency response characteristics of the main structure in mechanical environment experiment, dynamic analysis of the structure should be performed simulating impulse loads from the bottom base. Therefore, frequency response analysis (FRA) of the frame was then performed using the FEA software MSC.PATRAN/NASTRAN.Results of shock response spectrum (SRS) responses from the base excitations were given. Stress and acceleration dynamic responses of essential positions in the spacecraft injection course were also calculated and spectrometer structure design was examined considering stiffness / strength demands. In this simulation, maximum stresses of Cesic material in two acceleration application cases are 45.1 and 74.1 MPa, respectively. They are all less than yield strengths. As is demonstrated from the simulation, strength reservation of the frame is adequate, but amplitudes of some key positions' dynamic responses are numerically too high. It need be emphasized in the next stage of design and experimental research.

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Short carbon-fiber-reinforced ceramic -- Cesic -- for optomechanical applications

Cited by 7 publications

References 0 publications

Si/SiC optical coatings for C/SiC composites via gel-casting and gas silicon infiltration: Effects of carbon black content

Si/SiC optical coatings for C/SiC composites via gel-casting and gas silicon infiltration: Effects of carbon black content

Advanced CSiC Composites for High-temperature Nuclear Heat Transport with Helium, Molten Salts, and Sulphur-iodine Thermochemical Hydrogen Process Fluids

Optimization of a space spectrograph main frame and frequency response analysis of the frame

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