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A kind of measuring method of glass expansion coefficient

A technology of expansion coefficient and measurement method, which is applied in the field of measurement of glass expansion coefficient, can solve the problems of low accuracy and stability of test results, and achieve high accuracy and stability

Active Publication Date: 2018-08-17
DONGXU OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the traditional instrument testing sheet glass, affected by the uneven thickness of the glass end surface and the glass itself, especially for thin glass with a thickness below 1mm, the accuracy and stability of the test results are relatively low

Method used

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  • A kind of measuring method of glass expansion coefficient
  • A kind of measuring method of glass expansion coefficient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Select a bubble-free PDP glass block (between 5-10 grams, from the production line of Dongxu Optoelectronics Technology Co., Ltd.), and use a natural gas-oxygen burner to melt the sample.

[0037] Hold the glass block with tweezers and adjust the flame to a neutral flame. In order to prevent bursting, preheat the glass block at low temperature with a small part of the fire. After the temperature of the glass block is uniform and stable, heat one corner of the glass block and stick it on the end surface. On a hot glass rod, then burn the glass block into a uniform glass liquid (if bubbles are generated, remove them with tweezers), stick them on another glass rod, and then control the flame size of the burner to reduce the viscosity of the glass liquid appropriately (controlled at 10 3 -10 6 Pa seconds), it is uniformly drawn into a glass filament with a diameter of 2mm±0.10mm, and the length of the uniform part is not less than 40mm.

[0038] Cut off both ends of the g...

Embodiment 2

[0040] The coefficient of expansion measurement method is basically the same as that of Example 1. The difference from Example 1 is that the diameter of the glass fiber to be tested is 3 mm ± 0.10 mm, and the length of the glass fiber is 32 ± 1 mm. It is measured 5 times, and the results are shown in Table 1.

Embodiment 3

[0042] The coefficient of expansion measurement method is basically the same as in Example 1. The difference from Example 1 is that the diameter of the glass fiber to be tested is 6 mm ± 0.10 mm, and the length of the glass fiber is 24 ± 1 mm. It is measured 5 times respectively, and the results are shown in Table 1.

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Abstract

The invention discloses a method for measuring the expansion coefficient of glass. The method comprises: sending a flake or block glass sample to be measured into a dilatometer to measure the expansion coefficient. The method is characterized in that, before being sent into the dilatometer for measurement, the method It also includes pretreatment of the glass sample to be tested. The pretreatment method includes: melting the glass sample to be tested and drawing it into a glass filament with a diameter of Φ±0.1 mm, and then annealing the glass filament; wherein, Φ is 1.5-6 mm. The method of the invention has low sample processing difficulty, short sample preparation time, and high stability and accuracy of expansion coefficient test.

Description

technical field [0001] The invention relates to a method for measuring expansion coefficient, in particular to a method for measuring expansion coefficient of glass. Background technique [0002] The expansion coefficient refers to the elongation of the glass length when the temperature rises by 1 °C, in °C -1 . The expansion coefficient of glass is very small, generally around 10 -7 Magnitude. [0003] The thermal expansion coefficient of glass basically depends on the chemical composition of the glass, and it is an important inspection index for borosilicate glass, quartz glass and other glasses. In the research and development process of glass frit, the lower surface is in contact with the steel plate during the glass forming process, and the upper surface is naturally polished in the air. The forming of glass is different from the various forming processes of the production line, so the formed glass is not uniform. [0004] The traditional double-filament test method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/16G01N1/28
CPCG01N1/28G01N25/16
Inventor 李刚王丽红闫冬成李俊锋张广涛
Owner DONGXU OPTOELECTRONICS TECH CO LTD
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