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Preparation method of rod-like lithium disilicate crystal

A lithium disilicate and crystal technology is applied in the field of preparation of rod-shaped lithium disilicate crystals, which can solve the problems of affecting the light transmittance properties of lithium disilicate materials, unable to meet the matching of strength and toughness, etc., and achieve a controllable aspect ratio. , low cost, the effect of increasing the ion diffusion rate

Active Publication Date: 2015-09-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using traditional glass crystallization or powder compact sintering to control matrix crystallization cannot meet the requirement of matching strength and toughness. On the basis of not affecting its optical properties, the addition of strong and tough phases is limited. The choice of color Makes it possible to add almost no strengthening and toughening phases, such as ZrO 2 Particles, Si 3 N 4 Rod crystals, fibers, etc. will affect the light transmission properties of dental lithium disilicate materials

Method used

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  • Preparation method of rod-like lithium disilicate crystal
  • Preparation method of rod-like lithium disilicate crystal

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Embodiment 1

[0022] A method for preparing rod-shaped lithium disilicate crystals, comprising the following steps:

[0023] (1) Obtaining of raw material mixed powder: according to the molar ratio of SiO 2 / Li 2 CO 3 =1.5, carry out mass conversion: mass ratio SiO 2 / Li 2 CO 3 =1.216, take by weighing average particle diameter and be 5 μ m high-purity lithium carbonate powder (purity is 99.99%) 4.52g, nanometer high-purity silicon dioxide powder (purity is 99.99%) 5.48g, add dehydrated alcohol 40g, adopt oxidation Zirconium balls were wet-milled for 10 hours, mixed evenly, and then evaporated on a rotary evaporator to dry the alcohol, took it out, put it in a drying oven at 80°C, dried and sieved;

[0024] (2) Obtaining of raw powder of seed crystal: the raw material mixed powder after drying and sieving is mixed with adding flux to analyze pure Na 2 SO 4 Powder (purity ≥ 99%), by mass ratio: Na 2 SO 4 Powder / raw material mixed powder = 4 for weighing and mixing, adding 75g of abs...

Embodiment 2

[0029] A method for preparing rod-shaped lithium disilicate crystals, comprising the following steps:

[0030] (1) Obtaining of raw material mixed powder: according to the molar ratio of SiO 2 / Li 2 CO 3 =1.5, carry out mass conversion: mass ratio SiO 2 / Li 2 CO 3 =1.216, taking by weighing average particle diameter is 5 μ m high-purity lithium carbonate powder (purity is 99.99%) 9.04g, nanometer high-purity silicon dioxide powder (purity is 99.99%) 10.96g, adds dehydrated alcohol 80g, adopts oxidation Zirconium balls were wet-milled for 10 hours, mixed evenly, and then evaporated on a rotary evaporator to dry the alcohol, took it out, put it in a drying oven at 80°C, dried and sieved;

[0031] (2) Obtaining of raw powder of seed crystal: the raw material mixed powder after drying and sieving is mixed with adding flux to analyze pure Na 2 SO 4 Powder (purity ≥ 99%), by mass ratio: Na 2 SO 4 Powder / raw material mixed powder = 2 for weighing and mixing, adding 90g of ab...

Embodiment 3

[0036] A method for preparing rod-shaped lithium disilicate crystals, comprising the following steps:

[0037] (1) Obtaining of raw material mixed powder: according to the molar ratio of SiO 2 / Li 2 CO 3 =2, carry out mass conversion: mass ratio SiO 2 / Li 2 CO 3 =1.62, taking by weighing average particle diameter is 5 μm high-purity lithium carbonate powder (purity is 99.99%) 6.18g, nanometer high-purity silicon dioxide powder (purity is 99.99%) 3.82g, adds dehydrated alcohol 40g, adopts oxidation Zirconium balls were wet-milled for 10 hours, mixed evenly, and then evaporated on a rotary evaporator to dry the alcohol, took it out, put it in a drying oven at 80°C, dried and sieved;

[0038] (2) Obtaining of raw powder of seed crystal: the raw material mixed powder after drying and sieving is mixed with adding flux to analyze pure Na 2 SO 4 Powder (purity ≥ 99%), by mass ratio: Na 2 SO 4 Powder / raw material mixed powder = 4 for weighing and mixing, adding 75g of absolut...

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Abstract

Disclosed is a preparation method of a rod-like lithium disilicate crystal. The method comprises: performing wet ball-milling, drying and sieving of lithium carbonate and silica powder; mixing the dried and sieved mixed powder of raw materials and Na2SO4 via wet ball-milling by using zirconia balls, and performing drying and sieving; loosely putting raw powder of crystal seeds into an alumina crucible for sintering; finally cooling the obtained product to a room temperature to obtain the crystal seeds, and taking the crystal seeds out; stirring the crystal seeds in deionized water at a temperature of 60 DEG C to enable the crystal seeds to be fully dissolved; filtering the obtained solution; performing corrosion with 5 vol% of HF for 1-3h; washing the obtained product with deionized water; and drying the resultant product to obtain the Li2Si2O5 crystal. The rod-like lithium disilicate crystal obtained in the invention is controllable in length-diameter ratio and high in purity, can be taken as an enhancement phase and a toughening phase to be added into a composite material matrix, and has the characteristic of improving mechanical properties of a composite material.

Description

technical field [0001] The invention relates to a preparation process that can be used to improve the mechanical properties of the second phase and composite materials, in particular to a preparation method of rod-shaped lithium disilicate crystals. Background technique [0002] Lithium disilicate glass-ceramics is a type of ceramic material with outstanding mechanical and biological properties in bioceramics. 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 high strength and high toughness, which makes the wear resistance of this glass-ceramic theoretically close to that of tooth enamel, and will not cause excessive wear of natural teeth. Its unique aesthetics and biological properties are unmatched by metal materials and polymer materials. In addition, the expansion coefficient and light refraction coefficient of lithium disilicate rod-shaped cry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/60C30B29/34C30B28/02
Inventor 杨建锋张辉张亚明邓宇宸吴桐何志龙王波
Owner XI AN JIAOTONG UNIV
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