| 학회 | 한국재료학회 |
| 학술대회 | 2013년 가을 (11/06 ~ 11/08, 제주롯데호텔) |
| 권호 | 19권 2호 |
| 발표분야 | E. 구조 재료(Structural Materials) |
| 제목 | Lightweight Space Optical Mirror Technologies utilizing Reaction Sintered Silicon Carbides |
| 초록 | Future large-aperture optical space systems will need to use lightweight materials that meet stringent requirements. Lightweight optical systems produced quickly and cost-effectively, and the resultant lighter payloads, can reduce launch cost. Mirrors for future systems have areal density goals of less than 10 kg/m2 and will need to use new materials. Silicon carbide may be the best material available for mirror optics because of its outstanding combination of thermal and mechanical properties. This material has remarkable dimensional stability even under the disturbances of temperature, humidity and chemicals. Its specific stiffness and elastic modulus are higher than that of beryllium, which has toxicity. The density of SiC is slightly higher than aluminum and its fracture toughness higher than glass. The lower thermal expansion and higher thermal conductivity of SiC promote its use for space optics. Several different SiC ceramic manufacturing processes have been developed around world in recent years. Reaction sintering process with melt silicon infiltration technique are considered to be the suitable way for preparing SiC mirror substrate materials, and chemical vapor deposition(CVD) is suitable to be used in densification of substrate material and preparing SiC coating. The use of SiC to make mirrors and structures is in the developmental stage and has limited space heritage. To ensure the use of this material in space applications, qualification and system performance in the space environment must be addressed. In this presentation, an overview of SiC based lightweight space mirror technology with emphasis on the materials processing is provided. Concept and progress of currently ongoing project for 700mm scale SiC mirror development are also introduced. |
| 저자 | 권도균 |
| 소속 | 한국항공대 |
| 키워드 | SiC; Sapce mirror; Reaction Sintering; CVD |
