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Glass ceramic and preparation method thereof

A technology of glass ceramics and glass, applied in the field of glass ceramics and its preparation, can solve the problems that it is difficult to obtain glass ceramics with microscopic hierarchical structure

Active Publication Date: 2021-10-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies, provide a glass ceramic and its preparation method, solve the technical problem that it is difficult to obtain a glass ceramic with a microscopic hierarchical structure in the prior art, and further improve the mechanical properties

Method used

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  • Glass ceramic and preparation method thereof
  • Glass ceramic and preparation method thereof
  • Glass ceramic and preparation method thereof

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preparation example Construction

[0029] This specific embodiment also proposes a kind of preparation method of glass-ceramic, comprises the following steps:

[0030] S1. Raise the temperature of the precursor glass to T1 at a rate of 1-10°C / min and keep it warm for 1-4h. T1 is 540-580°C;

[0031] S2. Cool the precursor glass at a rate of 1-20°C / min to T2 and keep it warm for 1-4h, where T2 is 480-560°C, T1>T2;

[0032] S3, repeat steps S1-S2, continue to raise the temperature of the precursor glass to T3 and keep it warm for 1-4h, T3 is 560-650°C, T3>T1>T2;

[0033] S4. Continue to raise the temperature of the precursor glass treated in step S3 to 700-800° C. and keep it warm for 0.1-4 hours to obtain the glass-ceramic.

[0034] In some embodiments, before step S4, it further includes raising the temperature of the precursor glass to T4 and keeping it warm for 1-4 hours, where T4 is 610-690° C., and T4>T3.

Embodiment 1

[0037] The present embodiment proposes a kind of glass-ceramic, is made by following steps:

[0038] S1. Raise the temperature of the precursor glass to 580°C at a rate of 1°C / min and keep it warm for 1h;

[0039] S2. Lowering the temperature of the precursor glass to 480° C. at a rate of 1° C. / min and keeping it warm for 4 hours;

[0040] S3. Repeat steps S1-S2 once, continue to raise the temperature of the precursor glass to 600° C. and keep it warm for 1 hour;

[0041] S4. Continue to raise the temperature of the precursor glass to 750° C. and keep it warm for 2 hours to obtain the glass-ceramic.

[0042] The fracture toughness of the prepared glass ceramics is 2.2Mpa·m 1 / 2 , with a haze of 0.12, combined with figure 1 , the glass-ceramic has two micro-level structures; the micro-level structure includes a higher level structure formed by three-dimensional connected skeleton pillars, and the diameter of the higher level structure is about 50-150nm; the micro-level struct...

Embodiment 2

[0044] The present embodiment proposes a kind of glass-ceramic, is made by following steps:

[0045] S1. Raise the temperature of the precursor glass to 550°C at a rate of 5°C / min and keep it warm for 2 hours;

[0046] S2. Lowering the temperature of the precursor glass to 490° C. at a rate of 5° C. / min and keeping it warm for 3 hours;

[0047] S3. Repeat steps S1-S2 once, continue to raise the temperature of the precursor glass to 560° C. and keep it warm for 4 hours;

[0048] S4. Continue to raise the temperature of the precursor glass to 700° C. and keep it warm for 0.1 h to obtain the glass-ceramic.

[0049] The fracture toughness of the prepared glass ceramics is 1.0Mpa m 1 / 2 , with a haze of 0.2; combined with figure 2 , the glass-ceramic has more than two micro-level structures; the micro-level structure includes a higher-level structure formed by three-dimensional connected skeleton pillars, and the diameter of the higher-level structure is about 30-200nm; The mic...

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Abstract

The invention discloses glass ceramic and a preparation method thereof, and belongs to the technical field of glass materials. The glass ceramic comprises the following components in percentage by weight: 40 to 80 percent of SiO2, 5 to 25 percent of Al2O3, 1 to 15 percent of Li2O, 0.5 to 25 percent of Na2O, 0.1 to 1 percent of K2O and 0 to 5 percent of B2O3. The invention also provides a preparation method of the glass ceramic, which comprises the following steps: S1, heating precursor glass to T1 and preserving heat, T1 being 540-580 DEG C; s2, cooling the precursor glass to T2 and preserving heat, T2 being 480-560 DEG C, and T1>T2; s3, repeating the steps S1-S2, heating the precursor glass continuously to T3 and preserving heat, T3 being 560-650 DEG C, and T3>T1>T2; and S4, continuously heating the precursor glass treated in the step S3 to 700-800 DEG C, and carrying out heat preservation to obtain the glass ceramic. The glass ceramic has a microscopic hierarchical structure and excellent mechanical properties.

Description

technical field [0001] The invention relates to the technical field of glass materials, in particular to a glass ceramic and a preparation method thereof. Background technique [0002] As mobile electronic devices such as notebook computers, portable navigators, smart phones, etc. tend to become lighter and more powerful, people rely more and more on them. The increase in the frequency of use further puts forward higher requirements for packaging or casing materials of electronic devices, that is, making the packaging or casing materials lighter and thinner, and at the same time making the packaging or casing materials harder and stronger. [0003] Glass ceramics containing a large number of crystals (i.e., glass-ceramic) can greatly improve the flexural strength and fracture toughness of the material by extending the growth path of microcracks. Glass ceramics are usually crystallized and heat-treated on the precursor glass (mother glass), so that various crystals of unifor...

Claims

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Application Information

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IPC IPC(8): C03C10/00C03B32/02
CPCC03C10/0027C03C10/0018C03B32/02
Inventor 陆平陶海征
Owner WUHAN UNIV OF TECH
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