34 How are the high strength properties of tempered glass formed?

Tempering is due to the uniform heating and rapid cooling to complete the improvement of glass strength. There is basically no stress in ordinary glass.

Tempering is the use of a uniform speed to raise the temperature of ordinary glass by about 650 degrees Celsius, and then use cold air to quench, and the outer layer of the glass will quickly cool down. The internal temperature is still relatively high, resulting in the thermal expansion and contraction of the glass outside and the contraction and extrusion of the glass. At this time, the wind pressure is being lowered.

And the constant cooling rate maintains the expansion force inside the glass (that is, the surface shrinks, but there is no inside. This force is locked in the glass when an external force is received. First of all, it contradicts this power, and if it exceeds this power, the glass will burst, and if it does not exceed this power, the glass will not break.

This is the stress of glass.

Tempered glass changes the crystal structure of the glass during the tempering process, and is arranged in a regular hexagonal shape, so the strength is increased.

Tempered glass is divided into two types: physical tempering and chemical tempering. Chemical tempering is to change its atomic structure to improve strength, and physical tempering is to heat the glass to the softening point and then quench, so that the surface of the glass produces uniformly distributed compressive stress, so the tempered glass has changed the original mechanical properties. Tempered glass, also known as reinforced safety glass, is impact-resistant, and the small particles that form obtuse angles after breaking are not much harmful to the human body.

The strength of tempered glass is generally divided into several categories and what is the value.

Hello, There are 3 kinds of tempering; Steel this sail mega glass: tempering degree = 2 4n cm, glass curtain wall tempered glass surface stress 95mpa; Semi-tempered glass: tempering degree = 2n cm, glass curtain wall semi-tempered glass surface stress 24MPa 69MPa; Super strong car friend tempered glass:

4n/cm.Tempered glass is produced in a single piece, but can be reprocessed into laminated glass, insulating glass and other multi-layer composite glass. Compared with Fusen rental glass, the direct monolithic use is monolithic tempered glass.

Hope it helps.

1. High mechanical strength: The flexural strength of tempered glass can reach more than 125MPa, which is 4 5 times larger than that of ordinary glass. Poor pure late.

2. After being stressed, the bending deflection of up to 100mm can occur, and it can still be restored to its original state when the external force is removed.

3. Good thermal stability, the glass is not easy to burst when it is subjected to quenching and quenching.

Detect the authenticity of tempered glass:

Tempered glass can see color stripes on the edge of the glass through the polarizer, and on the surface of the glass, you can see the black and white spots polarizer can be found in the camera lens or glasses, pay attention to the adjustment of the light source when observing, so that it is easier to observe.

How to understand the influence of surface stress on the strength of glass jujube rock in the process of glass tempering, tempered glass is actually a kind of prestressed glass stool to call the glass, in order to improve the strength of the glass, usually use chemical or physical methods to form compressive stress on the surface of the glass, the glass first offset the surface stress when bearing external force, thereby improving the bearing capacity and improving the tensile strength of the glass. There are two main advantages of tempered glass, the first is that the strength is several times higher than that of ordinary glass, the bending strength is 3 5 times that of ordinary glass, and the impact strength of jujube is 5 10 times that of ordinary glass, which improves the strength and safety at the same time. Hope it helps.

High-strength tempered glass:

1. High-strength tempered glass is a kind of prestressed glass, which improves the strength and bearing capacity compared with ordinary glass.

2. High-strength tempered glass is based on the ordinary glass file using chemical or physical methods to form compressive stress on the surface of the glass, and the surface stress is first offset when the glass bears external force, so as to raise the bearing capacity of the eggplant cover and enhance the wind pressure, cold and heat resistance, impact and so on.

3. The impact strength of high nanobi strength tempered glass is 3 5 times that of ordinary glass, and the bending strength is 3 5 times that of ordinary glass.

Because Chinese tempered glass, in fact, is ordinary silicate glass, in tempering, generally through physical tempering, that is, after heating the surface of the rapid cooling of the surface to form a layer of stress and this kind of glass is generally used in construction The thickness is very large, so it gives people a very hard feeling. The glass on the mobile phone is generally Corning's alumina silicate glass is strengthened by ion exchange to form a pressure layer on the surface, in fact, the strength is higher than that of ordinary glass, but because the mobile phone glass is generally thick, it feels inferior to the so-called Chinese tempered glass, in addition to hardness and strength are two concepts, hardness is only the ability to resist foreign objects pressed into the surface of the material.

Tempered glass reinforced glass is a type of safety glass. Tempered glass is actually a kind of prestressed glass, in order to improve the strength of the glass, chemical or physical methods are usually used to form compressive stress on the surface of the glass, and the glass first counteracts the surface stress when it bears external force, thereby improving the bearing capacity and enhancing the wind pressure resistance, cold and heat resistance, impact and so on. Note the difference with FRP.

Physical tempered glass is also known as quenched tempered glass. It is to heat the ordinary flat glass in the heating furnace to close to the softening temperature of the glass (600), through its own deformation to eliminate the internal stress, and then move the glass out of the furnace, and then use a multi-head nozzle to blow high-pressure cold air to both sides of the glass, so that it can be quickly and evenly cooled to room temperature, can be made of tempered glass. This kind of glass is in a state of stress under internal tension and external compression, once the local damage occurs, the stress will be released, and the glass will be broken into countless small pieces, these small fragments have no sharp edges and corners, and are not easy to hurt people.

Chemical tempered glass is to improve the strength of the glass by changing the chemical composition of the surface of the glass, and the ion exchange method is generally used for tempering. The method is to immerse the silicate glass containing alkali metal ions into the lithium (Li+) salt in the molten state, so that the Na+ or K+ ions on the surface of the glass are exchanged with Li+ ions, and the Li+ ion exchange layer is formed on the surface, because the expansion coefficient of Li+ is less than Na+, K+ ions, so that the outer layer shrinks less and the inner layer shrinks more in the cooling process, when cooled to room temperature, the glass is also in the state of inner layer tension and outer layer compression, and its effect is similar to physical tempered glass.

Because China's technology is very high. When the tempered glass is broken, due to the release of internal "freezing" energy, the glass is broken into countless small particles, which reduces the possible injury to people, so the safety is greatly improved compared with ordinary glass.

China is excellent, tempering is due to the uniform temperature rise, rapid cooling to complete the improvement of glass strength. There is basically no stress in ordinary glass.

This depends on the brilliant minds of Chinese scientists, because they worked hard day and night to make such a good tempered glass.

Because China's science and technology are progressing, technology is developing, tempered glass has reached that level, which is a good reflection of national strength.

The technical level of China's tempered glass is indeed good, used in mobile phones, it is easy to use, and it is resistant to bumps, even if the mobile phone falls to the ground, it will not break, from these aspects, it shows that China has reached the world's advanced level in its manufacturing industry?

This is because China has the know-how to produce high-strength tempered glass.

Because Chinese workers are more serious and careful in their work, and China has developed science and technology in this area.

Because, made in China is originally of very good quality, and tempered glass is also of high quality.

Because China is very good in the tempered glass manufacturing process.

Because China's tempered glass technology has reached the top of the world.