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A kind of 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 problems such as limitations and failure to meet the mechanical properties of dental crowns and bridges, and achieve cost reduction, excellent processability, and easy large-scale industrialization. The effect of production

Inactive Publication Date: 2019-03-08
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 with low mechanical performance requirements, and cannot meet the mechanical performance requirements of crowns and bridges in the position of posterior teeth.

Method used

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  • A kind of high-strength lithium disilicate glass-ceramic and preparation method thereof
  • A kind of high-strength lithium disilicate glass-ceramic and preparation method thereof
  • A kind of high-strength lithium disilicate glass-ceramic and preparation method thereof

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specific Embodiment 1

[0029] Specific embodiment 1: In the lithium disilicate glass ceramic (#1 sample) of this embodiment, the main chemical component is SiO 2 And Li 2 The molar ratio of O is 2.55 and contains 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 is heated at 675℃ and 830℃ for 30 minutes each for two-stage heat treatment. After the complete crystallization, Li 2 Si 2 O 5 Main crystalline phase with a small amount of Li precipitation 3 PO 4 , Β-cristobalite and MgAl 2 Si 4 O 12 Crystal phase, the obtained glass ceramic has excellent performance, its average three-point bending strength reaches 530MPa and average fracture toughness is 3.4MPa·m 0.5 .

specific Embodiment 2

[0030] Specific embodiment 2: In the lithium disilicate glass ceramics (#2 sample) of this embodiment, SiO 2 And Li 2 The molar ratio of O is 2.47 and contains 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 addition amount of, adopts three-stage heat treatment, that is, pre-nucleating at 500℃ for 1 hour, and heating at 700℃ for 30 minutes. 2 SiO 3 To Li 2 Si 2 O 5 The crystalline phase transition is complete and the crystalline phase transition is completed by keeping it at 820°C for 1 hour. The main crystalline phase Li in the final product 2 Si 2 O 5 A short rod shape with a small amount of Li precipitated 3 PO 4 , Β-quartz (quartz) and Mg 3 Al 2 (SiO 4 ) 3 Crystal phase, the average three-point bending strength of the obtained glass ceramic reaches 574MPa and the average fracture toughness is 3.5MPa·m 0.5 .

specific Embodiment 3

[0031] Specific embodiment 3: In the lithium disilicate glass ceramics (#3 sample) of this 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 It is a glass nucleating agent and contains other components listed in Table 1. Adopt three-stage heat treatment, in the first stage of heat treatment, Li 2 SiO 3 The phase is precipitated first, and the phase is gradually transformed into nano-Li after the second heat treatment 2 Si 2 O 5 Phase, in the final crystallization stage for a longer time of heat preservation. Li in the final glass ceramic 2 Si 2 O 5 And Li 3 PO 4 Main crystalline phase, with a small amount of β-quartz, β-cristobalite and MgAl precipitated 2 Si 4 O 12 Crystalline phase. In the microstructure of the final glass ceramic product, it is found that the lithium disilicate crystal grains are rod-shaped aggregates with three-dimensional interlocking microstructures and excellent crystallization conditions. Because the obt...

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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, and belongs to the technical field of dental all-ceramic materials. Background technique [0002] At present, more and more attention is paid to the aesthetic restoration of teeth. Glass ceramic is a kind of all-ceramic material. It heats (or sinters) a matrix glass block (or powder) with a certain chemical composition. By controlling the nucleation and crystallization process, a uniform distribution of crystal 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, can well present the color and light transmission characteristics of natural teeth, and is the first choice for aesthetic restoration of anterior teeth. The preparation processes of common glass ceramic dental crown products mainly include glass powder raw material p...

Claims

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Application Information

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