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How to obtain fine 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: 2018-02-16
CDGM OPTICAL GLASS
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  • Description
  • Claims
  • Application Information

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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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  • How to obtain fine annealing temperature
  • How to obtain fine annealing temperature
  • How to obtain fine annealing temperature

Examples

Experimental program
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Embodiment

[0018] The DIL402PC thermal dilatometer from NETZSCH is used. The accuracy of the thermal expansion coefficient and the temperature calorific value of the instrument are corrected by the fused high-purity quartz standard sample of -100 ℃ ~ 900 ℃ provided by the instrument company. The measured standard sample data, temperature and standard Compared with the sample literature database, the measurement accuracy of the instrument meets 2×10 -7 / °C. The expansion coefficient and temperature accuracy of the instrument must be confirmed before the experiment. The glass sample requires uniform melting without bubbles, streaks and crystallization, Φ6×50mm, and the two end surfaces must be parallel. After measuring the length of the cleaned sample, put it into the measuring room of the instrument, set the same heating rate as the annealing rate, and test the sample to obtain the thermal expansion of the glass heated at 0.5°C / min~1°C / min close to the annealing rate curve, and then per...

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Abstract

The invention provides a method for accurately obtaining the finishing annealing temperature. A method for obtaining a fine annealing temperature, the method comprising the following steps: 1) heating a material to obtain a thermal expansion curve; 2) performing a first-order differential on the thermal expansion curve to obtain a first-order differential curve of thermal expansion; 3) starting the first-order differential curve of thermal expansion The transition temperature Tg0* is the lowest annealing temperature, and the first-order differential curve shows that there is a change in length per unit time; the transition temperature Tg1* of the first-order differential curve of thermal expansion is the optimum annealing temperature, and at this time the state of material relaxation reaches the maximum Optimally, the relaxed state of the glass microstructure is the best value for stress relief. The invention uses the first-order differential curve of the thermal expansion curve to quickly and accurately obtain the lowest and best annealing temperature required in the glass or ceramic annealing process.

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 from high-temperature liquid through rapid cooling, in the state of glass solidification and freezing, there is always internal stress in the glass due to rapid cooling, and the stress not only affects the parameters and uniformity of optical glass, but also affects its processing. . In order to eliminate 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 is relaxed (relaxed) before stress can be relieved. Tg is usually the temperature rise measured by a therma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B25/00
Inventor 欧玲
Owner CDGM OPTICAL GLASS
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