Toughened glass processing technology

Abstract

The invention discloses a toughened glass processing technology. The method comprises the following steps: 1) heating: taking a flat glass, heating the flat glass at the temperature of 650-750 DEG C for 3-10 min; 2) cooling: taking the glass out, and uniformly blowing air to two surfaces of the glass until the glass is uniformly cooled to 200-250 DEG C; 3) slow heating: slowly heating the glass tothe temperature of 270-280 DEG C, and performing insulation for 10-25 min; and 4) cooling the glass in the step 3) to room temperature to obtain the toughened glass. The method has the following advantages and effects that during a cooling process, gamma-ray is employed for irradiation, nickel sulfide in the glass is changed from a high-temperature phase alpha-NiS to a low-temperature phase beta-NiS, self-combustion of the toughened glass can be reduced, in the step 3), the glass is slowly heated to 270-280 DEG C, under gamma-ray irradiation, nickel sulfide in the glass changed from the high-temperature phase alpha-NiS to the low-temperature phase beta-NiS is subjected to further promotion, self-combustion of the toughened glass can be reduced, and the toughened glass has the advantages of high intensity, low self-combustion rate, and safe usage.

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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