Method for manufacturing glass ceramic molded body

Abstract

The invention provides a method for manufacturing a glass ceramic molded body. The manufacturing method of the glass ceramic molded body comprises the following steps: 1) carrying out primary crystallization heat treatment process on basic glass, including heating, heat-preservation nucleation, heating, heat-preservation crystallization and cooling to room temperature, so as to form pre-crystallized glass; and 2) carrying out hot-working molding on the pre-crystallized glass to obtain the glass ceramic molded body. According to the method, primary crystallization heat treatment is performed on the basic glass, so that the 3D heat processing difficulty of the microcrystalline glass is effectively reduced, the yield is increased, the production efficiency is improved, the production cost is reduced, and particularly for the high-transparency microcrystalline glass applied to the 3D front cover plate, the problems that the transmittance is reduced and the haze is increased after the transparent microcrystalline glass is subjected to heat processing and cannot be used are solved; the appearance index of hot-processed finished glass is stable and controllable, and transparent microcrystal curved glass with the same quality as cold-processed glass can be obtained.

Description

technical field [0001] The invention relates to a method for manufacturing a glass molding, in particular to a method for manufacturing a glass-ceramic molding. Background technique [0002] In recent years, with the continuous rise and development of consumer electronics, glass, as a transparent material with good performance, has been widely used in electronic devices. Since electronic equipment has many precise electronic components inside, it is necessary to provide a cover plate or a casing to protect the internal electronic components. In the content disclosed in the existing literature, metal is mostly used as the cover material, but metal has disadvantages such as easy oxidation and shielding of electromagnetic signals. There are also documents disclosing the use of glass as a cover plate. For example, CN101508524A discloses a chemically strengthened glass whose drop resistance and fracture toughness cannot meet the requirements. As a ceramic material that does not...

AI Technical Summary

Problems solved by technology

The basic glass is nucleated first to obtain a glass containing a large number of crystal nuclei and the crystal nuclei are evenly distributed. When the basic glass without nucleation is directly thermally processed, the appropriate temperature on the thermal processing machine can meet the thermodynamic conditions of nucleation. Crossing the nucleation barrier and nucleation by phase separation, but the kinetic time conditions cannot be satisfied. It takes a certain time for phase separation and nucleation growth, usually ranging from 0.5 hours to 6 hours, which is lower than the nucleation time of 0.5h The glass-ceramics cannot be controlled during the production of the basic glass and may not be able to obtain qualified basic glass-ceramics

During thermal processing, the time of each station of the thermal processing machine is controlled between 45 and 90s. Prolonging the station time will lead to a serious decrease in thermal processing efficiency and cannot be mass-produced

Second, the more important reason is that the temperature uniformity of the heating device of the current thermal processing machine cannot meet the requirements of nucleation

This method avoids some of the disadvantages of direct 3D thermal processing of the above-mentioned basic glass, but there are still many shortcomings and difficulties in the thermal processing and crystallization process

The main problem is that glass warping, shrinkage and shrinkage consistency are difficult to control after 3D thermal processing

The warping requirement of 3D front cover glass is ≤0.10mm (take the size of 150×75mm as an example). When the warping amount is more than 0.10mm, there will be problems when the OLED screen is attached to the 3D glass molding body, resulting in abnormal display.

At the same time, coupled with the difference in temperature uniformity of the heating device of the thermal processing machine, there is a great inconsistency in the shrinkage of the glass

When the 3D curved glass is applied to the cover plate, the outer dimension tolerance of the front cover is required to be ≤0.05mm, and the back cover is ≤0.10mm. Therefore, the problem of large size shrinkage and shrinkage inconsistency brings great difficulties to the mold design of 3D thermal processing. , when the mold design is slightly inappropriate, slivers are prone to appear during the thermal processing process (not only can the slivers fail to obtain the product, but will damage the mold and reduce the service life of the mold, the cost of the mold is the highest in the thermal processing process), and the product size and specifications vary greatly And other issues

[0013] It can be clearly seen from Table 1 that as the degree of crystallinity increases, the difficulty of glass thermal processing and pressing increases greatly, and the energy consumption increases rapidly

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