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Acquisition method for precision annealing temperature

A technology of annealing temperature and transition temperature, which is applied in the field of temperature acquisition, can solve the problems of inaccuracy and unspecific fine annealing temperature, and achieve the effect of improving uniformity and quality, and easy measurement and analysis

Active Publication Date: 2016-01-27
CDGM OPTICAL GLASS
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Problems solved by technology

However, the fine annealing temperature obtained by this method is not specific and accurate, and the optimum annealing temperature has always been the key to making high-quality optical glass (especially 10 6 One of the important parameters that must be obtained for large pieces of glass

Method used

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  • Acquisition method for precision annealing temperature
  • Acquisition method for precision annealing temperature
  • Acquisition method for precision annealing temperature

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Embodiment

[0018] Using the DIL402PC thermal expansion meter from NETZSCH, the accuracy of the thermal expansion coefficient and the calorific value of the instrument are corrected. The standard sample of fused high-purity quartz at -100℃~900℃ provided by the instrument company, the measured standard data, temperature and standard Comparing sample literature databases, the measurement accuracy of the instrument satisfies 2×10 -7 / ℃. The expansion coefficient and temperature accuracy of the instrument must be confirmed before the experiment. The glass sample is required to be melted uniformly without bubble streaks and devitrification, Φ6×50mm, and the two end faces must be parallel. Put the cleaned sample into the measuring chamber of the instrument after measuring the length, set the heating rate the same as the annealing rate, test the sample, and get the thermal expansion of the glass heated at 0.5℃ / min~1℃ / min close to the annealing rate Curve, and then perform the first derivative of...

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Abstract

The invention provides a method capable of accurately acquiring a precision annealing temperature. The acquisition method for the precision annealing temperature comprises the following steps: (1) heating a material, and obtaining a heat expansion curve; (2) carrying out first-order differential on the heat expansion curve to obtain a heat expansion first-order differential curve; (3) when a beginning conversion temperature Tg0* of the heat expansion first-order differential curve is a lowest annealing temperature, the first-order differential curve displays that length variation occurs per unit time; when the conversion temperature Tg1* of the heat expansion first-order differential curve is a best annealing temperature, determining the relaxation state of the material to be optimal, wherein the relaxation state of a glass micro structure is an optimum value eliminating the stress. By utilizing the first-order differential curve of the heat expansion curve, the lowest and optimum annealing temperatures needed in a glass or ceramic annealing process can be rapidly and accurately obtained.

Description

Technical field [0001] The invention relates to a method for obtaining temperature, in particular to a method for obtaining temperature when performing fine annealing on glass or ceramic materials. Background technique [0002] The fine annealing treatment of glass or ceramic materials is mainly to eliminate thermal stress and improve the uniformity of glass or ceramics. Since glass is a solid obtained by rapid cooling from a high-temperature liquid, there is always internal stress in the glass body due to rapid cooling when the glass is solidified and frozen. The stress not only affects the optical glass parameters and uniformity, but also affects its processing . In order to eliminate the stress, the glass is usually heated to a temperature that can eliminate the freezing state, that is, about 30°C below Tg. At this time, the microstructure of the glass relaxes (relaxes) before the stress can be relieved. Tg is usually the temperature rise measured by the thermal dilatometer ...

Claims

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Application Information

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IPC IPC(8): C03B25/00
Inventor 欧玲
Owner CDGM OPTICAL GLASS
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