In-situ preparation method for SiC reflective mirror blank and device
A technology of in-situ preparation and reflection mirrors, applied in the direction of mirrors, etc., can solve the problems of not too large specific stiffness, difficult to solve support problems, and inability to actively control the optical mirror surface, etc., and achieve the effect of simple and reliable process and small deformation
Inactive Publication Date: 2012-01-11
罗万前
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Problems solved by technology
This kind of open structure cannot be used to actively control the optical mirror surface, and it is not easy to solve the support problem when grinding the mirror surface, and its specific stiffness is not too large
Method used
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[0015] The following is an embodiment of the present invention: in figure 1 Middle, 1. CNC machining tools; 2. Mirror blank; 3. Vacuum pump and vacuum cover; 4. Heat insulation material; 5. Multifunctional self-heating upper mold shell; 6. Side mold; 7. Back panel; 8. Core mold ; 9. Honeycomb wall; 10. Cavity; 11. Reflective panel; 12. Multifunctional self-heating lower mold shell.
[0016] The reflection mirror blank (2) comprises: a reaction sintered silicon carbide reflection panel (9) with a dense reflection layer, a honeycomb core (7) and a back panel (5).
[0017] The device consists of: CNC machining tools (1), multifunctional self-heating upper and lower molds [(5)+(6)+(8)+(12)], heat insulation layer (4), vacuum pump and vacuum cover (3), etc. composition;
[0018] Its preparation method is:
[0019] (1) At the mirror blank preparation place, the CNC processing machine in the device manufactures a rectangular plate of C / C material whose profile matches the reflecti...
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The invention discloses an in-situ preparation method for an SiC reflective mirror blank and a device, belonging to the field of preparation of an optical device. The device comprises a numerically controlled processing machine, a multifunctional self-heating mold, a thermal insulation layer, a vacuum pump, a vacuum cover and the like. The preparation method is characterized in that: 1) the C / C multifunctional mold is manufactured by the numerically controlled processing machine during preparation of the mirror blanks; 2) an SiC bisque is sintered in the cavity of the mold via forming reaction; 3) the multifunctional mold is powered up to be heated to increase the temperature for sintering of the bisque in the mold under insulated and vacuum conditions; 4) the C or C / C core mold is removed via oxidation; 5) silicon doping is carried out for sintering of the bisque; and 6) densification is carried by a reflecting surface. When the mirror blank is prepared in the method, the process is simple and reliable; the prepared mirror blank has high structural stiffness; the amount of deformation is low during sintering; the thickness of each wall of the mirror blank is separately controlled according to the optimized design; and no additional vacuum high-temperature furnace is needed for preparation of SiC mirror blanks with different diameters. The method is particularly suitable for preparation of large-diameter (such as 8m) light SiC and C / SiC mirror blanks.
Description
technical field [0001] The invention relates to an in-situ preparation method and device for a SiC mirror blank, belonging to the field of optical device preparation. Background technique [0002] SiC has been recognized as the mirror blank material with nearly optimal properties. Due to the limitations of the manufacturing process and equipment, the size of the existing SiC telescope mirror blanks is not large. When the size of the mirror blank is large (for example, greater than 1.5 meters), several small mirror blanks are often brazed into a large mirror blank. However, for a single small mirror base, most of them only add reinforcing ribs on the rear surface of the reflective panel. This is an open structure without a back plate, and the large-size mirror blanks formed by soldering and brazing are still open structures without a back plate. This type of open structure cannot be used to actively control the optical mirror surface, and it is not easy to solve the suppor...
Claims
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Login to View More IPC IPC(8): G02B5/08C04B35/565C04B35/622
Inventor 张洪齐
Owner 罗万前