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Spontaneous hydro-thermal method for preparing special composite nano ceramic powder for ceramic tooth

A technology of nano-ceramic powder and hydrothermal method, which is applied in the direction of dentures, etc., can solve problems such as agglomeration, environmental pollution, and large particle size, and achieve the effects of low cost, good sintering activity, and good fluidity

Inactive Publication Date: 2012-01-25
上海景文材料科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN1389405 (publication date: 2003.01.08) describes the preparation of zirconia ceramic powder by calcining. This method is easy to cause agglomeration, the particle size is too large, and a large amount of hydrogen chloride gas is discharged, which has great pollution to the environment.

Method used

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  • Spontaneous hydro-thermal method for preparing special composite nano ceramic powder for ceramic tooth
  • Spontaneous hydro-thermal method for preparing special composite nano ceramic powder for ceramic tooth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] ZrOCl with a total weight of 35 g 2 ·8H 2 O, Y 2 O 3 and AL 2 O 3 According to the molar ratio of 94:5:1, dissolve in 100ml of ethanol, add 200ml of sodium bicarbonate solution with a mass percentage of 5%, add 0.175g of dispersant A15, that is, acrylate, then wash with ultrasonic washing equipment for 25 minutes, send Into the autoclave, hydrothermally reacted for 8 hours under the conditions of 4MPa and 220°C; the sediment was sent to the high-speed centrifuge washing equipment through the pipeline, washed at 16,000 rpm for 10 minutes, repeated 3 times, to remove the sodium chloride ions and residual impurities to obtain pure tetragonal composite nano-ceramic powder with high crystallinity.

[0026] The particle size of the nano-ceramic powder obtained in this example is between 20 and 30 nm.

Embodiment 2

[0028] ZrOCl with a total weight of 70 g 2 ·8H 2 O, Y 2 O 3 and AL 2 O 3 Dissolve in 200ml of ethanol at a molar ratio of 93:4:3, add 400ml of sodium bicarbonate with a concentration of 6% by mass, mix well, add 0.35g of dispersant A15 (acrylate), and then wash with ultrasonic washing equipment for 25 minutes , sent into the autoclave, hydrothermally reacted under the conditions of 5Mpa and 230 ° C for 9 hours; the sediment was sent to the high-speed centrifuge washing equipment through the pipeline for repeated filtration 3 times, and the sodium chloride ions and residual impurities were removed to obtain Pure tetragonal composite nano-ceramic powder with high crystallinity.

[0029] The particle size of the nano-ceramic powder obtained in this example is between 20 and 30 nm.

Embodiment 3

[0031] ZrOCl with a total weight of 350 g 2 ·8H 2 O, Y 2 O 3 and AL 2 O 3 Dissolve in 1000ml deionized water at a molar ratio of 89:8:3, add 2000ml of potassium bicarbonate with a concentration of 7% by mass, and mix well, add 1.75g ​​of dispersant A15 (acrylate), and then wash 25 minutes, sent into the autoclave, hydrothermally reacted under the conditions of 6Mpa and 240 ° C for 10 hours; the sediment was sent to the high-speed centrifuge washing equipment through the pipeline for repeated filtration 3 times, and the potassium chloride ions and residual impurities were removed, namely A pure tetragonal composite nano-ceramic powder with high crystallinity is obtained.

[0032] The particle size of the nano-ceramic powder obtained in this example is between 20 and 30 nm.

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Abstract

The invention relates to ceramic powder and a preparation method thereof in the technical field of ceramic materials, in particular to a spontaneous hydro-thermal method for preparing special composite nano ceramic powder for a ceramic tooth. The components are as follows according to molar percentage: 5 to 8 percent of yttrium oxide, 1 to 3 percent of aluminum oxide and 89 to 94 percent of zirconium oxide; and the particle diameter of composite nano ceramic powder particles is from 20 to 30 nanometers. The method has the characteristics of good toughness, nearly no crystal imperfection and favorable sintering activity; after being further processed by surface modification, the ceramic powder can form a spherical or subspherical structure; and the inner components are tightly combined with one another, are endued with favorable flowability and transport property, and can be directly used for the injection molding of a ceramic tooth piece. The preparation method has the advantages of simplicity, low cost and easy realization of industrial production.

Description

[Technical field] [0001] The invention relates to a ceramic powder in the technical field of ceramic materials and a preparation method thereof, in particular to a composite nano-ceramic powder specially prepared for ceramic teeth by a spontaneous hydrothermal method. [Background technique] [0002] Zirconia has excellent physical and chemical properties and is an important structural and functional ceramic material. This crystal transformation and volume change of pure zirconia, if used as a structural ceramic and functional ceramic coating material, will cause excessive thermal stress when subjected to thermal cycling, resulting in cracking and spalling failure of the ceramic finished product or coating. The addition of some special elements of zirconia will completely change this situation, increasing the toughness and thermal shock properties of the material. Moreover, the types of added elements are different, and the prepared zirconia powder has different uses. So fa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61C13/083C04B35/48C04B35/626
Inventor 陶景超
Owner 上海景文材料科技发展有限公司
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