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

Abstract

The invention provides an ultra-low expansion glass-ceramic for a laser gyroscope and a preparation method thereof, wherein the composition of the ultra-low-expansion glass-ceramic is: SiO2: 56-68%, Al2O3: 21-27%, Li2O: 2~4%, Na2O: 0~1%, K2O: 0~1%, MgO: 0~3%, ZnO: 0~1.5%, P2O5: 4.5~6.8%, TiO2: 1~2.5%, ZrO2: 1 ~2.5%, Sb2O3 / As2O3: 0.5~1.5%; its main crystal phase is β quartz solid solution, the crystal phase content is 70%~85%, the grain size is less than 50nm, and the order of magnitude of thermal expansion coefficient is 10-8. The preparation method includes batching, mixing, melting, homogenization, clarification, glass forming, annealing, and microcrystallization heat treatment; wherein the melting, homogenization, and clarification steps are all carried out at a temperature of 1570 ° C to 1590 ° C; the microcrystallization heat treatment process It is: under the condition that the nucleation rate is 1°C / min and the nucleation temperature is 650-750°C, keep warm for 6-10 hours and then heat up for crystallization, the crystallization rate is 1°C / min, and the crystallization temperature is 750-750°C 850°C, keep warm for 6-10 hours. The bending strength of this product is higher than 170MPa, and the processing roughness is better than that of the spectral transmittance in the 0.6-2μm band, reaching more than 90%; it has good hardness and anti-wear performance.

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...

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 glass, but this center stirring technology is often difficult to eliminate the center stripes of formed glass-ceramics, which seriously affects the quality of glass

So far, there is no report on the ultra-low expansion glass-ceramic and its preparation method that can eliminate the center stripe of the formed glass-ceramics and meet the requirements for the preparation of the laser gyroscope resonant cavity skeleton and the laser gyroscope mirror.