Lithium disilicate microcrystalline glass and preparation method thereof

A lithium disilicate and glass-ceramic technology, which is applied in the field of lithium disilicate glass-ceramics and its preparation, can solve the problems of decreased transparency, lack of vividness, and ugly appearance of materials, so as to improve strength, toughness and ensure stability and reliability effects

Active Publication Date: 2020-12-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reinforcing phase also forms a heterogeneous interface, which causes additional scattering of light, resulting in a significant decrease in the transparency of the material. The color of the material is whitish and heavy, and the appearance is ugly and lacks vividness, which is far from natural teeth.
Although the introduction of a heterogeneous reinforcement phase improv...

Method used

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  • Lithium disilicate microcrystalline glass and preparation method thereof
  • Lithium disilicate microcrystalline glass and preparation method thereof
  • Lithium disilicate microcrystalline glass and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The invention prepares high-strength and high-toughness lithium disilicate glass-ceramics with coexistence of multi-scale crystals. The method includes melting of transparent hard glass with lithium disilicate composition and heat treatment analysis of transparent hard glass with lithium disilicate composition. Crystallization obtains lithium disilicate glass-ceramics, specifically according to the following steps:

[0038] (1) Mixing of raw materials: Li 2 O, SiO 2 、Na 2 O.B 2 o 3 , ZnO, Al 2 o 3 , MgO, P 2 o 5 , ZrO 2 、K 2 O and rare earth oxides are evenly mixed to obtain a mixture. The specific ratio of raw materials is shown in Table 1 below.

[0039] The mass percent (wt.%) of each raw material of table 1 embodiment 1

[0040] Li 2 o

SiO 2

Na 2 o

B 2 o 3

ZnO Al 2 o 3

MgO P 2 o 5

ZrO 2

K 2 o

rare earth total 22 55 4 2.5 3 3 2 2 3 2 1.5 100

[0041] (2) Use absolute...

Embodiment 2

[0054] (1) Adopt the method as described in embodiment 1 to make the transparent hard glass of lithium disilicate composition.

[0055] (2) The first heat treatment of lithium disilicate glass-ceramics: a three-stage heat treatment process is adopted, and the heating system is ①500°C, 2h, ②675°C, 2h, ③815°C, 24h. After one-step heat treatment, lithium disilicate grains with relatively uniform size are precipitated in the glass.

[0056] (3) The second step heat treatment of lithium disilicate glass-ceramics: the glass-ceramics where lithium disilicate has been precipitated is rapidly heated to 965° C. at a heating rate of 75° C. / min, and then kept for 140 minutes. After the two-step heat treatment, the lithium disilicate crystals are partially remelted, a secondary recrystallization process occurs, and finally coarse lithium disilicate grains are formed.

[0057] (4) The third step heat treatment of lithium disilicate glass-ceramics: heat the lithium disilicate glass-cerami...

Embodiment 3

[0060] (1) Preparation of transparent hard glass with lithium disilicate component as described in Example 1.

[0061] (2) The first heat treatment of lithium disilicate glass-ceramics: a three-stage heat treatment process is adopted, and the heating system is ①550°C, 2h, ②600°C, 12h, ③875°C, 2h. After one-step heat treatment, lithium disilicate grains with relatively uniform size are precipitated in the glass.

[0062] (3) The second heat treatment of lithium disilicate glass-ceramics: the glass-ceramics where lithium disilicate has been precipitated is rapidly heated to 1035° C. at a heating rate of 90° C. / min, and then kept for 12 minutes. After the two-step heat treatment, the lithium disilicate crystals are partially remelted, a secondary recrystallization process occurs, and finally coarse lithium disilicate grains are formed.

[0063] (4) The third step heat treatment of lithium disilicate glass-ceramics: heat the lithium disilicate glass-ceramics that has undergone ...

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Abstract

The invention discloses lithium disilicate microcrystalline glass and a preparation method thereof, belonging to the technical field of microcrystalline glass preparation processes. According to the preparation method, transparent hard glass with a lithium disilicate component is used as a glass matrix, and a microstructure in which multiple scales of lithium disilicate grains with different sizescoexist is obtained through three-step heat treatment. In the first step of heat treatment, common lithium disilicate crystals with fine and uniform crystal grains are obtained; in the second step ofheat treatment, coarse crystal grains playing a toughening role are obtained through crystal remelting and secondary recrystallization; and in the third step of heat treatment, small lithium disilicate crystals are separated out again, a length-diameter ratio is larger, and glass strength is improved. With the three-step heat treatment, fine and uniform lithium disilicate crystals are differentiated into two crystals with obvious size and form difference, so homogeneous toughening effect is achieved, the fracture toughness of the lithium disilicate microcrystalline glass is effectively improved, a heterogeneous phase is not introduced, the transparency and appearance of a material are not influenced, and the use stability and reliability of the material are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of glass-ceramic preparation technology, and relates to a lithium disilicate glass-ceramic and a preparation method thereof. Background technique [0002] Lithium disilicate glass-ceramics is a kind of inorganic non-metallic material which is safe and non-toxic, has good mechanical properties and physical and chemical properties, and has a translucent appearance. It can be used to imitate teeth, repair or restore human natural teeth. Decorate, restore the biological function and beautiful appearance of teeth, and treat various dental diseases such as tooth necrosis, defect, loss, dark spots, and yellow teeth caused by diseases, environments, accidents and other factors. Lithium disilicate has good machinability, simple follow-up heat treatment, and can be processed to the net size. The bending strength is above 360MPa, which is higher than the strength standard of natural teeth (245MPa), and meets the streng...

Claims

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Application Information

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IPC IPC(8): C03C10/04C03B32/02
CPCC03C10/0009C03B32/02
Inventor 冯雪婷张佩南小叶王甜
Owner SHAANXI UNIV OF SCI & TECH
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