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High-strength and high-permeability lithium disilicate glass ceramic as well as preparation method and application thereof

A lithium disilicate, glass ceramic technology, applied in glass manufacturing equipment, glass furnace equipment, dental preparations, etc., can solve problems such as strength maintenance, achieve high permeability fracture toughness, reduce the risk of chipping, and the process is simple Effect

Active Publication Date: 2021-10-15
AIDITE (QINHUANGDAO) TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN108069611A discloses a highly permeable lithium silicate glass-ceramics and lithium disilicate glass-ceramics, their preparation method and application. 2 with Li 2 The mass ratio of O, so as to control the crystal size of lithium disilicate to less than 200nm, because the crystal size is lower than the range of 380-780nm of visible light, the prepared glass ceramics show high light transmittance, but the fine crystal size cannot be formed Good three-dimensional interweaving and grain interlocking microstructure, resulting in the strength still maintained at the current level, that is, 360-450MPa
The fracture toughness of IPS series from Ivoclar-Vivadent is 2.0-2.5MPa m 1 / 2 , according to ISO6872, when the fracture toughness is higher than 3.0MPa·m 1 / 2 When the fracture toughness is higher than 3.5MPa m 1 / 2 , it can be used as a three-unit pontic for posterior teeth, but the fracture toughness of most glass ceramics is difficult to meet this requirement

Method used

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  • High-strength and high-permeability lithium disilicate glass ceramic as well as preparation method and application thereof
  • High-strength and high-permeability lithium disilicate glass ceramic as well as preparation method and application thereof
  • High-strength and high-permeability lithium disilicate glass ceramic as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] This embodiment provides a preparation method of high-strength and high-permeability lithium disilicate glass ceramics, the preparation method comprising the following steps:

[0072] (1) Put the raw materials of lithium disilicate glass ceramics into the mixer according to the proportion, mix the ingredients for 40 minutes, put them in a platinum crucible after mixing, and melt them at 1450°C for 5 hours, and wait until the components are evenly distributed and there are no air bubbles After escaping completely, the basic glass liquid is obtained;

[0073] (2) Pour the basic molten glass obtained in step (1) into a mold at 420°C for annealing for 10 hours, and then naturally cool to room temperature to obtain a matrix glass;

[0074] Heat the base glass to 520°C, keep it warm for 130 minutes, and then cool it down to room temperature naturally; then raise the temperature to 660°C, keep it warm for 150 minutes, then cool it down to room temperature naturally; then use C...

Embodiment 2

[0082] This embodiment provides a preparation method of high-strength and high-permeability lithium disilicate glass ceramics, the preparation method comprising the following steps:

[0083] (1) Put the raw materials of lithium disilicate glass ceramics into the mixer according to the proportion, mix the ingredients for 30 minutes, put them in a platinum crucible after mixing, and melt them at 1450°C for 3 hours, until the components are evenly distributed and there are no air bubbles After escaping completely, the basic glass liquid is obtained;

[0084] (2) Pour the basic molten glass obtained in step (1) into a mold at 400°C for annealing for 3 hours, and then naturally cool to room temperature to obtain a matrix glass;

[0085] Heat the base glass to 550°C, keep it warm for 100 minutes, and then cool it down to room temperature naturally; then raise the temperature to 660°C, keep it warm for 180 minutes, then cool it down to room temperature naturally; then use CAD / CAM mac...

Embodiment 3

[0087] This embodiment provides a preparation method of high-strength and high-permeability lithium disilicate glass ceramics, the preparation method comprising the following steps:

[0088] (1) Put the raw materials of lithium disilicate glass ceramics into the mixer according to the proportion, mix the ingredients for 60 minutes, put them in a platinum crucible after mixing, and melt them at 1450°C for 5 hours, and wait until the components are evenly distributed and there are no air bubbles After escaping completely, the basic glass liquid is obtained;

[0089] (2) Pour the basic molten glass obtained in step (1) into a mold at 450°C for annealing for 2 hours, and then naturally cool to room temperature to obtain a matrix glass;

[0090] Heat the base glass to 570°C, keep it warm for 140 minutes, and then cool it down to room temperature naturally; then raise the temperature to 670°C, keep it warm for 210 minutes, and then cool it down to room temperature naturally; then us...

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Abstract

The invention provides a high-strength and high-permeability lithium disilicate glass ceramic and a preparation method and application thereof. The lithium disilicate glass ceramic with lithium disilicate as a main crystalline phase and lithium metasilicate, lithium phosphate or quartz as an impure phase is prepared by optimizing the raw material ratio and regulating and controlling heat treatment conditions, wherein the size of lithium disilicate crystals is larger than 700 nm, and the length-diameter ratio is not less than 3. The three-point bending strength of the lithium disilicate glass ceramic is 450-750 MPa, the fracture toughness of the lithium disilicate glass ceramic is higher than 3.5 MPa.m<1 / 2>, and the optical transmittance of a sample with the thickness of 1 mm at 550 nm is adjustable within 10%-80%. The lithium disilicate glass ceramic has excellent properties of high strength and high permeability, effectively reduces the risk of restoration collapse, better simulates the toughness and light transmittance of natural teeth, and has a better application prospect.

Description

technical field [0001] The invention belongs to the technical field of glass-ceramics, and in particular relates to a glass-ceramic and its preparation method and application, in particular to a high-strength and high-permeability lithium disilicate glass-ceramic and its preparation method and application. Background technique [0002] Lithium disilicate glass-ceramic is a glass-ceramic with uniform distribution of crystalline phase and glass phase and dense structure. Since the refractive index (1.55) of the lithium disilicate crystal formed by crystallization has a good optical match with the refractive index (1.50) of the glass matrix, it has excellent translucency and can simulate the color of natural teeth to the greatest extent. And light-transmitting properties, so it has excellent aesthetic effects. In addition, due to its good mechanical properties and the inherent characteristics that the glass matrix is ​​easily etched by HF, it can better solve the problems of o...

Claims

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Application Information

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IPC IPC(8): C03C10/04C03C10/02C03C10/14C03C4/00C03B5/16C03B25/00C03B32/02A61K6/836
CPCC03C10/0027C03C4/0021C03B5/16C03B25/00C03B32/02A61K6/836C03C3/097A61K6/833C03B5/18C03B19/02C03B25/02C03C10/00C03C2204/00
Inventor 张佳新聂全义赵丽佳周生刚虞勇王晓俊
Owner AIDITE (QINHUANGDAO) TECH CO LTD
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