The invention relates to the technical field of glass shrinkage measurement and discloses a glass shrinkage measuring method. The method includes 1) a step of providing glass silk, marking two datum lines at intervals on the glass silk, and measuring the length L1 between the two datum lines, 2) a step of subjecting the glass silk to preset thermal treatment, 3) a step of measuring the length L2 between the two datum lines again of the glass silk after the step 2), and 4) a step of calculating the shrinkage [Psi] of the glass silk according to an equation that is [Psi]=(L1-L2)/L1. The method can overcome the problem that glass shrinkage cannot be measured to provide experiment reference data in plane glass development processes due to irregularity and small sizes of artificially molten glass. The method is high in measuring precision and reliability and is of high practical value for glass performance research.

A glass shrinkage measuring method

The invention relates to a thin glass tempering treatment technology, and in particular relates to fused salt for thin glass chemical tempering and a production process thereof. The main component of the fused salt is KNO3, and the auxiliary component is KCl, K2CO3, KSb(OH)6 and gamma-Al2O3, the warming speed of a pre-heating furnace in the production process is 5+/-0.5 DEG C per minute, heat preservation is performed for 30+/-5 minutes after the temperature is raised to 350+/-5 DEG C, and then the glass is placed in the fused salt so as to be subjected to the ion exchange; the glass subjected to the ion exchange is placed in an annealing furnace so as to be cooled, and the temperature of the annealing furnace is 300+/-5 DEG.C; a power source is turned off after the glass is placed therein, so as to slowly cool to 50+/-5 DEG.C, and then the glass is taken out so as to be cleaned, dried and packaged. The surface stress of the normal soda lime silica glass produced by the invention can achieve 650MPa and more, the stress layer depth can achieve 23microns and more; the surface stress of alkaline alumina silicate glass can achieve 850MPa and more, and the stress layer depth can achieve 40 microns and more.

Ion exchange process for thin glass chemical tempering and fused salt

The invention discloses a chemical tempering method and a method for removing impurities in chemical tempering potassium nitrate molten salt. The method for removing impurities in chemical tempering potassium nitrate molten salt is used when the impurity removal is carried out for the first time as the chemical tempering effect cannot meet the production requirements at the beginning of the use of the potassium nitrate molten salt or after the potassium nitrate molten salt is used for a period of time. The method comprises the following steps: (1) keeping the tempering production operation temperature, and adding potassium carbonate into the molten salt to enable the potassium carbonate to be molten; (2) placing potassium silicate into a meshed container, adding the container with the potassium silicate into the molten salt, leaving to stand, and then taking out the container with the potassium silicate; (3) adding silicon dioxide into the molten salt, stirring, leaving to stand, and carrying out the chemical tempering production after the molten salt is clear; if the chemical tempering effect cannot meet the production requirements after the molten salt subjected to first-time impurity removal is used for a period of time, the steps (2) and (3) are repeated for second-time impurity removal. According to the invention, the process is simple, the operation is convenient, the chemical tempering effect of the molten salt subjected to impurity removal is similar to that of the molten salt at the original state, the service life of the molten salt is prolonged, and the production cost is reduced.

Chemical tempering method and method for removing impurities in chemical tempering potassium nitrate molten salt

The invention provides a high-strength chemically-strengthened glass, which belongs to the technical field of glass At least one side of the high-strength chemically-strengthened glass contains an ion exchange layer which contains divalent alkaline earth metal ions entering the high-strength chemically-strengthened glass in virtue of an ion exchange type chemical strengthening process; and the ion exchange layer also contains monovalent alkali metal ions entering the high-strength chemically-strengthened glass in virtue of the ion exchange type chemical strengthening process The invention also provides a strengthening method for a glass substrate The strengthening method comprises a step of placing a to-be-strengthened glass substrate in an ion exchange salt bath for ion exchange strengthening so as to obtain the high-strength chemically-strengthened glass The strengthening method for the glass substrate is simple to operate and convenient for industrial production The provided high-strength chemically-strengthened glass has greater surface pressure stress and ion exchange depth, so the glass has better strength and shock resistance

High-strength chemically-strengthened glass and glass strengthening method

The invention belongs to the technical field of glass performance testing, and relates to a method using a dilatometer to measure the electronic flat glass shrinkage. The method comprises the following steps: measuring the length of a sample to be measured by a screw micrometer, then placing the sample into a dilatometer, carrying out heating-cooling-heating according to a certain temperature, cooling the sample to the room temperature; reading the shrinkage amount after the sample is cooled to the room temperature and the sample temperature becomes stable, using the average value of last six values so as to minimize the error, and finally calculating the glass shrinkage. According to the provided method, the built-in software testing function of the dilatometer can record the change of length after heating, thus the glass shrinkage can be calculated, and the method has the characteristics of simple operation and high measurement precision.

Method using dilatometer to measure electronic flat glass shrinkage

The invention mainly relates to a method for testing the shrinkage rate of electronic flat glass. The method comprises the following steps: drawing measurement reference lines e and f at the two ends of a sample to be tested of the electronic flat glass in the length direction; averagely dividing the sample to be tested into reference samples A and C and a measurement sample B in the width direction; measuring the distance between the measurement reference line e and the measurement reference line f on the sample B, performing reheating-cooling treatment on the sample B through a precision annealing furnace, measuring the displacement of the measurement reference lines of the sample B under an optical microscope, and calculating the shrinkage rates X1 and X2 of the middle upper edge and the middle lower edge of the sample B and the average shrinkage rate X of the sample B. According to the method, the measurement sample is subjected to reheating-cooling treatment through the precision annealing furnace, so that the annealing quality of the glass is improved; the shrinkage rate of the glass is calculated by measuring the length change of the glass sample before and after treatment in the precision annealing furnace through the optical microscope; the method has the characteristics of simplicity for operation and high measurement accuracy.

Feng Xiulao

Papers

Method for testing shrinkage rate of electronic flat glass

Method for removing potassium nitrate impurity ions on line in chemical tempering production

Glass plate with high strain point for microcrystalline silicon solar cell substrate