Multi-crystal-nucleus composite transparent glass ceramic and preparation method thereof

Abstract

The invention discloses multi-crystal-nucleus composite transparent glass ceramic and a preparation method thereof. The preparation method of the multi-crystal-nucleus composite transparent glass ceramic comprises the following steps that: S1, multiple nucleating agents are added during glass melting; S2, plain glass with a certain boundary dimension is obtained after processing; S3, the plain glass obtained in S2 is placed under the condition that the temperature is T1 and heated for 1-6 hours for annealing treatment, after annealing treatment is completed, the plain glass is placed under thecondition that the temperature is T2 and is heated for 1-6 hours and subjected to nucleation treatment, after nucleation treatment is completed, the plain glass is placed under the condition that thetemperature is T3 and heated for 0-3 hours for crystallization treatment, and T1 is smaller than T2. According to the invention, the glass ceramic containing various crystal nucleuses and crystal phases of lithium disilicate and petalite is prepared, the nucleation and crystallization energy required by the crystal precipitation is reduced through the multiple crystal nucleuses, the heat treatment temperature and the heat treatment time can be reduced, the crystal ratio can be adjusted, and the glass ceramic prepared through the preparation method has characteristics of enhanced damage resistance, good fracture toughness and wide application range.

Description

technical field [0001] The invention relates to the technical field of glass production and manufacturing, in particular to a polycrystalline core composite transparent glass ceramic and a preparation method thereof. Background technique [0002] Glass-ceramics is a kind of composite material combined with crystal phase and glass made by high-temperature melting, molding and heat treatment. Generally, crystal nucleating agents are added to glass raw materials, and nucleation and crystallization are controlled during heat treatment. , to obtain bulk crystallization containing a large number of microcrystals. Compared with glass, glass ceramics are widely used in large-area touch-screen electronic products such as smartphones and tablet computers because they have uniform crystals generally smaller than 10 μm, and their strength is an order of magnitude higher than that of ordinary glass. [0003] At present, glass ceramic products on the market are based on adding a certain ...

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Problems solved by technology

[0004] Known glass-ceramic materials, because only a single type of crystal nucleating agent is added in the preparation process, the crystal phase is single, resulting in limited structural strength of glass-ceramics; at the same time, due to the small number of crystal nuclei in ceramic glass, the proportion of precipitated crystals Limited, often showing inherent brittleness, low tensile strength, resulting in poor damage resistance and fracture toughness of glass ceramic materials, and the small number of crystal nuclei can easily lead to large crystals (greater than 100nm), affecting the visible light transmission of glass ceramics rate, thereby limiting the scope of application of glass ceramics and reducing their practicability. For example, the existing glass ceramics have a visible light transmittance of less than 85%, and cannot be used for display covers of electronic products.

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