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Method for measuring practical softening point temperature of glass

A technology of softening point temperature and measurement method, applied in the direction of material thermal expansion coefficient, investigation stage/state change, etc., can solve the problems of large error, high dependence on measurement accuracy and accuracy, etc., to reduce measurement error, improve measurement accuracy, cost saving effect

Active Publication Date: 2020-02-04
湖北戈碧迦光电科技股份有限公司
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The measurement precision and accuracy of this method are highly dependent on the accuracy of measuring the height change and change rate of the glass during the heating process, which is likely to cause large errors

Method used

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  • Method for measuring practical softening point temperature of glass
  • Method for measuring practical softening point temperature of glass

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with embodiment, but is not limited to the content on the description.

[0019] 1.1 Instruments and standard samples

[0020] The DIL402PC thermal dilatometer of NETZSCH, Germany, 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 uncertainty of the linear thermal expansion coefficient of the instrument measured material is ≤2×10 -7 / °C, temperature uncertainty ≤2°C.

[0021] 1.2 Measurement process

[0022] 1.2.1 Sample requirements: uniform melting without bubbles, stones and crystallization, Φ(5~9)×50mm, and the two end surfaces must be parallel.

[0023] 1.2.2 The expansion coefficient and temperature accuracy of the ther...

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Abstract

A method for measuring a practical softening point temperature of glass is characterized in that: first-order differentiation of a thermal expansion curve is utilized to perform analysis, so as to obtain the optimal practical softening point temperature of glass; variation, a variation rate and a contractibility rate of the glass at the practical softening point temperature also can be obtained; and practical softening point temperatures of glass samples with different temperature rise rates and different sizes can be obtained. The method of the invention has the beneficial effects that: through the obtained analysis data, microstructure change characteristics of the glass at a temperature close to a softening point can be known, thereby facilitating formulation of production moulding andsecondary compression processes, and improving product quality.

Description

technical field [0001] The invention relates to glass forming and hot pressing technology, in particular to a method for measuring the practical softening point temperature of glass. Background technique [0002] Glass softening point temperature (ie viscosity is 10 7.6 dPa.s): If the glass sample is higher than this temperature, the density and surface tension will decrease rapidly, and the glass will have spontaneous fluidity (that is, the softening point characteristic of glass). The softening point temperature is the reference temperature for glass molding, solidification and secondary pressing. Therefore, it is very necessary to accurately measure the softening point temperature with fluidity. [0003] At present, the softening point temperature of glass is measured, and most of them are measured by flat-plate viscometer flat-press method. The test principle is: place a glass sample of a specified size under a vertically pressed mandrel, then place it in the center o...

Claims

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Application Information

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IPC IPC(8): G01N25/04G01N25/16
CPCG01N25/04G01N25/16
Inventor 华凯欧玲
Owner 湖北戈碧迦光电科技股份有限公司