High-strength lithium disilicate glass ceramic and preparation method thereof

A technology of lithium disilicate and glass ceramics, which is applied in the field of dental all-ceramic materials, can solve the problems that cannot meet the requirements and limitations of the mechanical properties of dental crowns and bridges, achieve excellent processability, reduce costs, and facilitate large-scale industrialization. The effect of production

Inactive Publication Date: 2014-10-22
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nevertheless, the clinical application of lithium disilicate glass-ceramics currently on the market is still relatively limited, mainly used in dental products

Method used

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  • High-strength lithium disilicate glass ceramic and preparation method thereof
  • High-strength lithium disilicate glass ceramic and preparation method thereof
  • High-strength lithium disilicate glass ceramic and preparation method thereof

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specific Embodiment 1

[0029] Specific embodiment one: in the lithium disilicate glass-ceramic (#1 sample) of the present embodiment, main chemical composition SiO 2 and Li 2 The molar ratio of O is 2.55, containing a small amount of MgO and Al 2 o 3 As a reinforcing component, P 2 o 5 as a glass nucleating agent, and other components listed in Table 1. The base glass was heat-treated in two stages at 675°C and 830°C for 30 minutes each, and Li 2 Si 2 o 5 as the main crystal phase, and a small amount of Li is precipitated 3 PO 4 , β-cristobalite and MgAl 2 Si 4 o 12 crystal phase, the obtained glass-ceramics have excellent properties, with an average three-point flexural strength of 530MPa and an average fracture toughness of 3.4MPa m 0.5 .

specific Embodiment 2

[0030] Specific embodiment two: in the lithium disilicate glass-ceramic (#2 sample) of the present embodiment, SiO 2 and Li 2 The molar ratio of O is 2.47, containing P 2 o 5 Glass nucleating agent and other components listed in Table 1. Compared with the chemical composition of specific example 1, more MgO is introduced and Al is reduced 2 o 3 The amount of addition, using three-stage heat treatment, that is, at 500 ° C for 1 hour for pre-nucleation, 700 ° C for 30 minutes for Li 2 SiO 3 to Li 2 Si 2 o 5 The crystal phase transformation, and the temperature at 820°C for 1 hour makes the crystal phase transformation complete. The main crystal phase Li in the final product 2 Si 2 o 5 It is in the shape of a short rod, and a small amount of Li is precipitated 3 PO 4 , β-quartz (quartz) and Mg 3 al 2 (SiO 4 ) 3 crystal phase, the average three-point flexural strength of the obtained glass ceramics reaches 574MPa, and the average fracture toughness is 3.5MPa m 0...

specific Embodiment 3

[0031] Specific embodiment three: in the lithium disilicate glass-ceramic (#3 sample) of the present embodiment, SiO 2 : Li 2 The molar ratio of O is 2.49, MgO:Al 2 o 3 The molar ratio is 1:1, P 2 o 5 is a glass nucleating agent and contains other components listed in Table 1. Three-stage heat treatment is adopted, and in the first stage heat treatment, Li 2 SiO 3 The phase is first precipitated, and after the second stage of heat treatment, the phase gradually transforms into nano-Li 2 Si 2 o 5 Phase, in the last stage of crystallization for a longer time of heat preservation. In the final glass ceramics, Li 2 Si 2 o 5 and Li 3 PO 4 Main crystal phase, and a small amount of β-quartz, β-cristobalite and MgAl are precipitated 2 Si 4 o 12 crystal phase. In the microstructure of the final glass-ceramic product, it is found that the lithium disilicate grains are rod-shaped aggregates with a three-dimensional interlocking microstructure, and the crystallization co...

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Abstract

The invention discloses high-strength lithium disilicate glass ceramic and a preparation method thereof. The glass ceramic comprises the following chemical components in percentage by weight: 59-80% of SiO2, 10-18% of Li2O, 0.1-14% of MgO, 0-15% of Al2O3, 1-8% of P2O5, 0-5% of Na2O, 0-7% of CaO, 0-9% of K2O, 0.5-8% of stabilizer and 0-10% of colorant, wherein the stabilizer is selected from one or more of ZrO2, SrO, BaO and Y2O3, and the colorant is selected from one or more of Eu2O3, CeO<+>, Tb4O7, La2O3, Ta2O5, MnO2 and Fe2O3. The lithium disilicate glass ceramic is a material which contains a residual glass phase, a Li2Si2O5 principal crystalline phase and a small quantity of Li3PO1, quartz, cristobalite, zirconium oxide or magnesium-aluminum silicate phase and is prepared by controlling nucleation and crystallization processes after carrying out heat treatment on lithium disilicate matrix glass. The lithium disilicate glass ceramic is very high in bending strength and fracture toughness and favorable in translucence and chemical stability and can serve as a full-ceramic dental material applied to the field of dental restoration.

Description

technical field [0001] The invention relates to a high-strength lithium disilicate glass ceramic and a preparation method thereof, belonging to the technical field of dental all-ceramic materials. Background technique [0002] At present, the aesthetic restoration of teeth has been paid more and more attention. Glass-ceramic is a kind of all-ceramic material. It is heat-treated (or sintered) to a matrix glass block (or powder) with a certain chemical composition. By controlling the nucleation and crystallization process, a uniform distribution of crystalline phase and glass phase is obtained. , Dense polycrystalline solid material. Because it contains a certain amount of glass phase, glass-ceramic has excellent translucent properties, and can well present the color and light transmission properties of natural teeth. It is the material of choice for aesthetic restoration of anterior teeth. The preparation process of common glass-ceramic dental crown products mainly includes...

Claims

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Application Information

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IPC IPC(8): C03C10/10
Inventor 黄赛芳曹鹏黄朝晖高唯
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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