Discussion on tempered glass and nickel sulfide

[China Glass Network] In recent years, there have been incidents of self-explosion of tempered glass in the domestic media, mainly due to the slight damage caused by the debris in the process of scattering after the self-explosion. The problem of self-explosion of tempered glass has always surrounded the idea of ​​fear. In the case that people don't understand it, the word "self-explosive" is mistaken for air bombs and glass cancer. In fact, the tempered glass blew is not as terrible as it is. The potential self-explosion of tempered glass has always been the focus of attention. Experts in developing countries have tried to use effective means to curb it. The original detonation treatment in the factory was carried out in the German standard DIN18516:1990, but the self-explosion rate was still not effectively controlled. Therefore, with the introduction of the EN14179:2005 standard, not only the processing time is shortened, but also the possibility of self-explosion caused by nickel sulfide is more effectively reduced, and the feasibility of its induced burst damage test is verified.

1 homogenization

Glass deep processing enterprises increase the homogenization treatment after finishing the tempering treatment, effectively reducing the probability of self-explosion.

1.1 The homogenization cycle process includes three stages of heating, constant temperature, and cooling.

T glass at any point temperature, °Cd ambient temperature

t time, hour a heating stage

1 by the front glass reaches 280 ° Cb constant temperature stage

2 after a piece of glass reaches 280 ° Cc cooling stage

1.2 heating stage

The heating phase begins when all of the glass is loaded into the homogenizing furnace and begins to contact the ambient temperature, ending when the next glass reaches 280 °C. The time to reach this temperature is determined in the calibration procedure. This time depends on the size of the homogenizing furnace, the amount of treated glass, the spacing between the glass, and the heating capacity of the heating system.

Note 1: The glass spacing and heating rate should be controlled to reduce the glass from being broken by thermal stress. To promote efficient heating, the furnace air temperature can exceed 320 °C. However, the glass surface temperature must not exceed 320 °C. The glass surface temperature should be less than 300 ° C.

Note 2: When the glass temperature exceeds 300 ° C, care should be taken to ensure that the glass characteristics are not significantly changed.

1.3 constant temperature stage

The isothermal phase begins with a surface temperature of 280 ° C for all glasses. The duration is 2 hours.

In order to ensure that the glass surface temperature is maintained within the range of 290 ± 10 ° C throughout the constant temperature period, the homogenizing furnace needs precise control.

1.4 cooling stage

The cooling phase begins at a later temperature of 280 ° C and the glass is at a constant temperature of 290 ± 10 ° C for 2 hours. At this stage the glass temperature should be cooled to ambient temperature.

The cooling phase can be ended when the furnace air temperature reaches 70 °C.

Note: The cooling rate should be controlled so that the glass is reduced to a smaller extent due to thermal stress cracking.

1.5 homogenization treatment system

1.5.1 homogenizing furnace

The homogenizing furnace should use forced convection heating to heat each piece of glass with unrestricted air circulation. If there is damage to the glass, the airflow cannot be blocked. The airflow in the furnace should be parallel to the glass surface.

Note: Air inlets and outlets should be designed to ensure that glass fragments do not block them.

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