Ultra-low-expansion glass ceramic for laser gyro and preparation method thereof

A technology of glass-ceramic and laser gyroscope, applied in Sagnac effect gyroscope and other directions, can solve the problems of mirror polishing and anti-wear of laser gyroscope skeleton, it is difficult to eliminate the center stripe of forming glass-ceramic, and reduce the hardness of glass. , to achieve the effect of no bubbles, enhanced relative motion, and improved stirring effect

Active Publication Date: 2009-09-23
SINOMA SYNTHETIC CRYSTALS CO LTD +1
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Domestic existing two Chinese patent applications whose publication numbers are respectively CN1944300A and CN1847182A relate to this ultra-low expansion glass-ceramic. The flux of the glass, its effect is to reduce the hardness of the glass while fluxing, which is not good for the mirror polishing and anti-wear of the laser gyro frame
According to reports, glass-ceramics usually use center stirring technology in the melting process of basic gl

Method used

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Examples

Experimental program
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preparation example Construction

[0016] The preparation method of the present invention includes the following steps: taking the above-mentioned compound according to the composition of the oxide mass percentage, carrying out metering and proportioning, after accurately weighing with an electronic balance, mixing it evenly in a mixer, and heating it in a smelting furnace at 1570°C to 1590°C Platinum crucible is used for melting at high temperature; the glass melt is homogenized and clarified by eccentric stirring; then the glass frit is poured into cast iron molds by pouring process, and placed in an annealing furnace for precision annealing at a temperature range of 500°C to 600°C .

[0017] Among them, after the batch material is melted at a temperature of 1570 ° C to 1590 ° C, it must be stirred during the homogenization and clarification process. In the traditional technology, the center stirring technology is usually used, and the center stirring will cause the formed glass-ceramics to produce Central st...

example 1

[0024] The raw material formula contained in the basic glass is composed of the oxide mass percentage: SiO 2 : 56%, Al 2 o 3 : 23%, Li 2 O: 4%, MgO: 3%, ZnO: 1.2%, P 2 o 5 : 6.8%, TiO 2 : 2.5%, ZrO 2 : 2.0%, Sb 2 o 3 : Mix evenly with 1.5% ingredients, melt at 1570°C, implement eccentric stirring during the melting process, perform casting molding and annealing after homogenization and clarification; then heat-treat the annealed glass-ceramic, nucleate The rate is 1°C / min, the nucleation temperature is 700°C, the holding time is 6 hours, and then the temperature is raised for crystallization treatment. The crystallization rate is 1°C / min, the crystallization temperature is 800°C, and the holding time is 8 hours. Invented ultra-low expansion glass-ceramics. Its main crystal phase is β-quartz solid solution, the main crystal phase content is 75%, the grain size is 37.6nm, the bending strength is 174MPa, the spectral transmittance (5mm thick) is 90% in the 0.6-2μm band, ...

example 2

[0026] The process steps are basically the same as in Example 1, except that the raw material formula contained in the basic glass is composed of SiO 2 : 58%, Al 2 o 3 : 27%, Li 2 O: 2.7%, Na 2 O: 1.0%, K 2 O: 1.0%, ZnO: 1.5%, P 2 o 5 : 4.8%, TiO 2 : 2.3%, ZrO 2 : 1.0%, Sb 2 o 3 : Mix evenly with 0.7% ingredients, melt at 1590°C, implement eccentric stirring during the melting process, perform casting molding and annealing after homogenization and clarification; then heat-treat the annealed glass-ceramic, nucleate The rate is 1°C / min, the nucleation temperature is 680°C, and the holding time is 10 hours; then the temperature is raised for crystallization treatment. The crystallization rate is 1°C / min, the crystallization temperature is 780°C, and the holding time is 10 hours. Invented ultra-low expansion glass-ceramics, the main crystal phase is β-quartz solid solution, the main crystal phase content is 78%, the grain size is 31.5nm, the bending strength is 183MPa, a...

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PUM

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Abstract

The invention provides an ultra-low-expansion glass ceramic for a laser gyro and a preparation method thereof, wherein, the ultra-low-expansion glass ceramic includes the following ingredients according to mass percentages: 56-68% of SiO2, 21-27% of Al2O3, 2-4% of Li2, 0-1% of Na2, 0-1% of K2, 0-3% of MgO, 0-1.5% of ZnO, 4.5-6.8% of P2O5, 1-2.5% of TiO2, 1-2.5% of ZrO2 and 0.5-1.5% of Sb2O3/As2O3; the principal crystalline phase is beta quartz solid solution; the crystalline phase content is 70-85%; the grain size is lower than 50nm; and the magnitude order of coefficient of heat expansion is 10<-8>. The preparation method comprises the steps of dosing, mixing, melting, evening, clarifying, glass moulding, annealing and sitallization heat treatment, wherein, the steps of melting, evening and clarifying are carried out at 1570-1590 DEG C; the sitallization heat treatment comprises the steps as follows: the materials are crystallized after 6-10 hours of warm keeping at nucleating temperature of 650-750 DEG C with crystallizing rate of 1 DEG C/min; the crystallizing temperature is 750-850 DEG C; and the warm-keeping time is 6-10 hours. The buckling strength of the ultra-low expansion glass ceramic is higher than 170MPa; the process roughness is higher than 2-star; and the spectrum transmittance is more than 90% within the waveband of 0.6-2mum. In addition, the ultra-low-expansion glass ceramic has excellent hardness and abrasion resistance.

Description

technical field [0001] The invention relates to an ultra-low-expansion glass-ceramic and a preparation method thereof, in particular to an ultra-low-expansion glass-ceramic for a laser gyroscope and a preparation method thereof for manufacturing a laser gyroscope resonator frame and a laser gyroscope reflector. Background technique [0002] In recent years, due to the development of inertial guidance technology, the laser gyroscope, as its core component, has also developed rapidly. The laser gyroscope has the advantages of short start-up time, strong impact resistance, high reliability, and long life. It is being used in different fields. Gradually replace the traditional electromechanical gyroscope. Since the laser gyroscope needs to meet the use under different conditions, it also puts forward extremely stringent requirements for its constituent materials. Transmittance, high uniformity, and at the same time, because the laser gyroscope resonator skeleton needs to be pro...

Claims

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Application Information

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IPC IPC(8): C03C10/14G01C19/72
Inventor 范仕刚余明清赵春霞刘杰何粲陈广乐
Owner SINOMA SYNTHETIC CRYSTALS CO LTD
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