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Crystal seed toughened lithium disilicate glass ceramic composite material and preparation method thereof

A lithium disilicate and glass-ceramic technology, which is applied in the field of glass-ceramic materials and their preparation, can solve the problem that the lithium disilicate glass-ceramic cannot meet the strength requirements, and the lithium disilicate glass-ceramic is difficult to achieve strength, Perfect matching of fracture toughness and light transmission properties to achieve the effect of improved strength and fracture toughness and excellent mechanical properties

Inactive Publication Date: 2019-03-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The strength of the lithium disilicate glass-ceramics prepared by this method cannot meet the strength requirements of the three unit pontics of the clinical front and back crowns and anterior teeth.
[0004] Lithium disilicate glass-ceramics prepared by the above process is difficult to achieve a perfect match of strength, fracture toughness and light transmission properties

Method used

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  • Crystal seed toughened lithium disilicate glass ceramic composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment is a kind of seed crystal toughened lithium disilicate glass-ceramic composite material, the raw material is composed of lithium disilicate glass powder and lithium disilicate crystal seed crystal, the lithium disilicate glass powder is 98wt%, two Lithium silicate seed is 2wt%;

[0024] The lithium disilicate glass powder raw material is made of SiO 2 72.12wt%, Li 2 O is 11.60wt%, P 2 o 53.05wt%, ZrO 2 3.20wt%, Al 2 o 3 3.60wt%, K 2 O is 4.30wt%, CeO 2 1.63wt%, La 2 o 3 Composition of 0.50 wt%.

[0025] The preparation method of this embodiment is:

[0026] Step 1. According to the distribution ratio of lithium disilicate glass powder raw materials, the raw materials are placed in a corundum tank, wet-mixed with absolute ethanol as a medium for 2 hours, and then the uniformly mixed slurry is dried by a rotary evaporator;

[0027] Step 2. Put the raw material dried in step 1 into a quartz crucible, and raise the temperature to 1450°C at a heat...

Embodiment 2

[0035] This embodiment is a kind of seed crystal toughened lithium disilicate glass-ceramic composite material, the raw material is composed of lithium disilicate glass powder and lithium disilicate crystal seed crystal, the lithium disilicate glass powder is 90wt%, two Lithium silicate seed is 10wt%;

[0036] The lithium disilicate glass powder raw material is made of SiO 2 71.61wt%, Li 2 O is 13.82wt%, P 2 o 5 2.05wt%, ZrO 2 3.11wt%, Al 2 o 3 3.32wt%, K 2 O is 3.06wt%, CeO 2 1.87wt%, La 2 o 3 Composition of 1.16 wt%.

[0037] The preparation method of this embodiment is:

[0038] Step 1. According to the distribution ratio of lithium disilicate glass powder raw materials, put the raw materials in a corundum tank, use absolute ethanol as the medium for wet mixing for 1 hour, and then use a rotary evaporator to dry the uniformly mixed slurry;

[0039] Step 2. Put the raw material dried in step 1 into a quartz crucible, raise the temperature to 1500°C in a silicon-m...

Embodiment 3

[0046] This embodiment is a kind of seed crystal toughened lithium disilicate glass-ceramic composite material, the raw material is composed of lithium disilicate glass powder and lithium disilicate crystal seed crystal, the lithium disilicate glass powder is 95wt%, two Lithium silicate seed is 5wt%;

[0047] The lithium disilicate glass powder raw material is made of SiO 2 70.70wt%, Li 2 O is 12.20wt%, P 2 o 5 3.10wt%, ZrO 2 2.89wt%, Al 2 o 3 5.60wt%, K 2 O is 2.00wt%, CeO2 2 1.91wt%, La 2 o 3 Composition of 1.60 wt%.

[0048] The preparation method of this embodiment is:

[0049] Step 1. According to the distribution ratio of lithium disilicate glass powder raw materials, the raw materials are placed in a corundum tank, wet-mixed with absolute ethanol as the medium, and then the uniformly mixed slurry is dried by a rotary evaporator;

[0050] Step 2. Put the raw material dried in step 1 into a quartz crucible, heat up to 1500°C in a silicon-molybdenum rod resista...

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Abstract

The invention relates to a crystal seed toughened lithium disilicate glass ceramic composite material and a preparation method thereof. The composite material is prepared from the following raw materials of lithium disilicate glass powder and lithium disilicate crystal seeds, and the lithium disilicate glass powder is prepared from the following raw materials of SiO2, Li2O, P2O5, ZrO2 and Al2O3, K2O, CeO2 and La2O3. The preparation method comprises the following steps that proportioning is carried out according to the composition proportion of the lithium disilicate glass powder, ball milling,wet mixing and drying are carried out, the mixture is put into a crucible for melting, molten glass is poured into distilled water for water quenching so as to obtain granular original glass, ball milling is carried out on the granular original glass so as to obtain the glass powder, then the lithium disilicate glass powder and the lithium disilicate crystal seeds obtained through corrosion through a solid-phase synthesis method are taken according to the mass percent, alcohol serves as a medium for mixing and ball milling, and finally vacuum hot-pressing sintering is carried out so as to prepare the crystal seed toughened lithium disilicate glass ceramic composite material. The material has the advantages that the bending strength and the fracture toughness index are excellent, the semi-permeability is good, and the problems that the mechanical property of lithium disilicate glass ceramic is low, and the optical performance and the mechanical property are not matched with each othercan be solved.

Description

technical field [0001] The invention relates to a glass-ceramic material and a preparation method thereof, in particular to a seed crystal toughened lithium disilicate glass-ceramic composite material and a preparation method thereof. Background technique [0002] Lithium disilicate glass-ceramic is a series of precipitated lithium disilicate (Li 2 Si 2 o 5 ) is a general term for glass-ceramics with the main crystal phase. Its main component is Li 2 O and SiO 2 , in addition to adding P 2 o 5 , B 2 o 3 , ZrO 2 、K 2 O, Al 2 o 3 , CaO, CeO 2 , La 2 o 3 and other components to improve the mechanical and optical properties of lithium disilicate glass-ceramic materials by acting as a flux and a nucleating agent. Lithium disilicate crystal has a suitable thermal expansion coefficient and light refraction coefficient, and can achieve good thermodynamic and optical matching with the glass phase, so that lithium disilicate glass ceramics can still maintain excellent ...

Claims

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Application Information

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IPC IPC(8): C03C10/04C03B32/02
CPCC03B32/02C03C10/00
Inventor 杨建锋张亚明赵婷吕茜庚侯宝强王波
Owner XI AN JIAOTONG UNIV
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