Aluminosilicate tempered glass and preparation method thereof

Abstract

The invention relates to aluminosilicate tempered glass and a preparation method thereof. According to the aluminosilicate tempered glass, mixed molten salt of NaNO3 and KNO3 is adopted for conducting one-step strengthening on the aluminosilicate glass. The aluminosilicate glass is prepared from the following components in percentage by weight: 48 percent to 61 percent of SiO2, 23 percent to 34 percent of Al2O3, 4 percent to 7 percent of Li2O, 1.5 percent to 6 percent of Na2O, 0.01 percent to 3 percent of K2O, 1 percent to 5 percent of MgO, 0.4 percent to 6 percent of B2O3, 0.1 percent to 1 percent of Y2O3 and 0.4 percent to 3 percent of ZrO2, wherein the ratio of B2O3 to Y2O3 is from 4 to 5. The aluminosilicate toughened glass has excellent mechanical properties, can tolerate rough ground falling resistance and rough surface roller rolling tests, and has a high crushing degree factor gamma.

Description

technical field [0001] The invention relates to the technical field of glass manufacturing, in particular to an aluminosilicate strengthened glass and a preparation method thereof. Background technique [0002] Mobile phones have become a necessity in daily life today, tablet computers are also becoming popular, and various devices with touch screen panels are also widely used in various industries. In recent years, with the development of mobile Internet 5G communication technology and wireless charging technology, more and more mobile phones have begun to use double-sided glass design. At the same time, in order to pursue differentiated and personalized design concepts such as thinness and narrow bezels, more and more mobile phones have adopted 3D curved cover or back panel designs. [0003] The vast number of mobile phone end users are still not satisfied with the simple drop resistance, scratch resistance and falling ball impact resistance. These performance tests are o...

AI Technical Summary

Problems solved by technology

[0009] For example, the upper cover glass does not perform well in the test of rough ground drop resistance and rough surface roller tumbling test, and the degree of toughness is very high. After breaking in practical applications, a large number of fine glass particles will be produced (the broken degree factor γ is relatively small), In this way, the following problems inevitably arise: (1) Dense cracks are generated after being broken into fine particles. Although the corresponding shape is still maintained due to the OCA glue, a large number of broken cracks have blocked the screen display, and the mobile phone or other smart devices will be damaged. It will completely lose the display function and cannot be used; (2) The fine glass particles may enter the user's eyes, mouth, etc., especially children, and may hurt hands and other exposed human body parts because the particles are too fine

Therefore, the mechanical properties of traditional cover glass need to be further improved

At the same time, although the aforementioned aluminosilicate glass also involves research on the coefficient of thermal expansion, its thermal expansion coefficient at 35°C to 50°C is 73 to 95×10 -7 ℃ -1 , 350℃~550℃ thermal expansion coefficient is 80~100×10 -7 ℃ -1 , still needs to be further improved to better meet the temperature requirements of 3D hot bending of cover glass and 3D glass suitable for more complex structures made of 3D molds

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