Processing technology of tempered glass

Abstract

The invention discloses a processing technology of tempered glass, which comprises the following steps: step 1, heating, taking flat glass, and heating at 650°C-750°C for 3-10min; step 2, cooling, taking out the glass, and spraying evenly on both sides of the glass Blow air to cool the glass uniformly to 200-250°C; step 3, slowly heat the glass to 270-280°C, and keep it warm for 10-25min; step 4, cool the glass in step 3 to room temperature to obtain tempered glass. The present invention has the following advantages and effects: gamma ray irradiation is used in the cooling process to promote the transformation of nickel sulfide in the glass from the high-temperature phase α-NiS to the low-temperature phase β-NiS, reducing the self-explosion of the prepared tempered glass; secondly, step 3 In the process, the glass is slowly heated to 270-280°C, and under the irradiation of gamma rays, it can further promote the transformation of nickel sulfide from the high-temperature phase α-NiS to the low-temperature phase β-NiS, further reducing the self-explosion of the tempered glass and reaching the strength High, low self-explosion rate of tempered glass, safe to use.

Description

technical field [0001] The invention relates to the technical field of glass manufacturing, in particular to a processing technology of tempered glass. Background technique [0002] Tempered glass is a kind of safety glass that forms a compressive stress layer on the surface of glass after heating-quenching method or other methods. Tempered glass has high strength and good thermal stability. Obtuse angle broken small particles are not easy to cause serious damage to the human body and improve the safety during use. Since tempered glass cannot be cut again, when preparing tempered glass, ordinary glass is first cut into the designed size, then heated to about 700 degrees Celsius near the softening point, and then rapidly and uniformly cooled to obtain tempered glass. [0003] However, compared with ordinary glass, tempered glass has the defect of self-explosion. The automatic explosion of tempered glass without direct mechanical external force is called self-explosion of tem...

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Problems solved by technology

[0003] However, compared with ordinary glass, tempered glass has the defect of self-explosion. The automatic explosion of tempered glass without direct mechanical external force is called self-explosion of tempered glass. There are many reasons for tempered glass self-explosion, among which the phase change of nickel sulfide crystals It is the main cause of self-explosion of tempered glass. At present, the mechanism of how nickel sulfide is mixed into tempered glass is not clear. Nickel sulfide is a crystal with two crystal phases, high-temperature phase α-NiS and low-temperature phase β-NiS, phase transition The temperature is 379 degrees Celsius. In the process of preparing tempered glass, the heating temperature is much higher than the phase transition temperature of nickel sulfide, so that all nickel sulfide is converted into the high-temperature phase α-NiS. In the subsequent rapid cooling process, the high-temperature phase α-NiS is too late Converted into low-temperature phase β-NiS, it is frozen in tempered glass. At room temperature, high-temperature phase α-NiS is in an unstable state and tends to gradually transform into low-temperature phase β-NiS. This transformation is accompanied by 2%- The volume expansion of 4% makes the tempered glass bear huge phase change tensile stress, which leads to the self-explosion of the tempered glass

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