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Lithium disilicate microglass fiber and preparation method thereof

A lithium disilicate, glass fiber technology, applied in the direction of glass manufacturing equipment, manufacturing tools, etc., can solve the influence of semi-permeability that is not clearly mentioned, the light transmittance of lithium disilicate glass ceramics is reduced, and the appearance of teeth is difficult to natural. Comparing with other problems, to achieve the effect of low cost, improved mechanical properties and good spinnability

Active Publication Date: 2022-04-26
晶瓷(北京)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These studies focus on the strengthening and toughening of lithium disilicate glass ceramics. Although the toughening mechanisms such as phase transition of heterogeneous phases, crack deflection / bifurcation, bridging, and pull-out effects are analyzed, they are not explicitly mentioned. The effect of these toughening measures on its semipermeability
The introduction of the heterogeneous toughening phase will inevitably cause unfavorable factors such as non-uniformly dispersed second phases, heterogeneous interfaces, and refractive index mismatches that strongly scatter and refract photons, thereby making lithium disilicate glass ceramics transparent. Decreased light rate, difficult to match the appearance of natural teeth

Method used

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  • Lithium disilicate microglass fiber and preparation method thereof
  • Lithium disilicate microglass fiber and preparation method thereof

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preparation example Construction

[0027] A preparation method of lithium disilicate glass-ceramic fiber, comprising the following steps:

[0028] (1) Take tetraethyl orthosilicate (TEOS) as silicon source and add in dehydrated alcohol, obtain A solution after dissolving;

[0029] (2) Lithium acetate was taken as lithium source and dissolved in deionized water to obtain solution B; the molar ratio of lithium source and silicon source was always kept at 1:1.

[0030] (3) Mix the A solution prepared in step (1) with the B solution prepared in step (2), stir, slowly add ammonia water to adjust the pH value, and slowly add the spinning aid polyvinyl alcohol dropwise, stir at room temperature for 2-8 Obtain the precursor sol in 1 hour, wherein the addition of polyvinyl alcohol is 5~15% of the quality of the precursor sol;

[0031] (4) Concentrating the precursor sol in step (3) in a water bath at 20-70°C to the sol to be spun;

[0032] (5) the sol to be spun in step (4) is spun by electrospinning equipment to obta...

Embodiment 1

[0036] (1) Take 2g of absolute ethanol in a beaker, add 9g of TEOS, and stir magnetically at room temperature for 10 minutes to obtain A solution;

[0037] (2) Take 2.85g of lithium acetate as a lithium source and dissolve it in 3.1g of deionized water, and stir it with a magnetic stirrer for 3 minutes to obtain solution B; the molar ratio of lithium source and silicon source is always kept at 1:1.

[0038] (3) Mix A solution and B solution, stir, slowly add ammonia water to adjust the pH value to 7, and slowly add spinning aid polyvinyl alcohol, and stir at room temperature for 5 hours to obtain a uniform slightly white precursor sol, wherein , the addition of polyvinyl alcohol is 10% of the mass of the mixed sol; the degree of polymerization of polyvinyl alcohol is 2000, and the degree of alcoholysis is 50%.

[0039] (4) Concentrate the precursor sol in a water bath at 50° C. to the sol to be spun; the concentration time is 36 hours, and it is aged at room temperature until ...

Embodiment 2

[0043] (1) Take 2g of absolute ethanol in a beaker, add 9g of TEOS, and stir magnetically at room temperature for 10 minutes to obtain A solution;

[0044] (2) Take 2.85g of lithium acetate as a lithium source and dissolve it in 3.1g of deionized water, and stir it with a magnetic stirrer for 5 minutes to obtain solution B; the molar ratio of lithium source and silicon source is always kept at 1:1.

[0045] (3) Mix A solution and B solution, stir, slowly add ammonia water to adjust the pH value to 5, and slowly add spinning aid polyvinyl alcohol, and stir at room temperature for 2 hours to obtain a uniform slightly white precursor sol, wherein , the addition of polyvinyl alcohol is 5% of the mass of the mixed sol; the degree of polymerization of polyvinyl alcohol is 1500, and the degree of alcoholysis is 45%.

[0046] (4) Stir and concentrate the precursor sol at 20° C. to the sol to be spun; the concentration time is 72 hours, and it is aged at room temperature until the viscos...

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Abstract

The invention discloses a preparation method of lithium disilicate glass-ceramic fiber, using TEOS as the silicon source, lithium acetate as the lithium source, polyvinyl alcohol as the spinning aid, stirring at room temperature for a certain period of time, concentrating and aging Finally, a precursor sol with a suitable viscosity is obtained, which is collected continuously by electrospinning and sintered at 800-950°C in air to obtain dense lithium disilicate glass-ceramic fibers. The preparation method of the invention is simple, easy to operate, low in cost and less in pollution, and provides a material basis for preparing fiber-toughened lithium disilicate glass-ceramic glass with matching light transmittance and mechanical properties.

Description

technical field [0001] The invention belongs to the field of preparation of engineering ceramics, and relates to a lithium disilicate glass-ceramic fiber 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 whose crystals are the main crystal phase. Its excellent mechanical properties and perfect natural luster can achieve the color and appearance close to natural teeth. Moreover, the lithium disilicate crystal itself has suitable thermodynamic properties and light refraction coefficient, so that the glass-ceramics of this series can maintain a good semi-permeability effect while having a high crystal phase content, and can achieve high strength and aesthetic effects. unity. It is the first choice material in the all-ceramic restoration system, especially the single crown restoration, and it shows broad application prospects in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C13/00C03B37/01
CPCC03C13/006C03B37/011
Inventor 赵婷陈倩秦毅朱建锋张佩方媛方园
Owner 晶瓷(北京)新材料科技有限公司
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