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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, applied in dentures, etc., can solve the problems of large particle size, environmental pollution, agglomeration, etc., and achieve the effects of good fluidity, good sintering activity, and low cost

Inactive Publication Date: 2009-09-23
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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] ZrOCl with a total weight of 35g 2 ·8H 2 O, Y 2 o 3 and AL 2 o 3 The molar ratio is 94:5:1, dissolve in 100ml ethanol, add 200ml of 5% sodium bicarbonate solution, add 0.175g dispersant A15, i.e. acrylate, then wash with ultrasonic cleaning equipment for 25 minutes, send Put it into a high-pressure reactor, and conduct a hydrothermal reaction at 4MPa and 220°C for 8 hours; send the sediment to a high-speed centrifuge washing equipment through a pipeline, wash at 16,000 rpm for 10 minutes, and repeat 3 times to remove sodium chloride ions and residual impurities, that is, pure tetragonal phase composite nano-ceramic powder with high crystallinity is obtained.

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

Embodiment 2

[0028] ZrOCl with a total weight of 70g 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 and mix evenly, then add 0.35g of dispersant A15 (acrylic acid ester), and then wash with ultrasonic cleaning equipment for 25 minutes , sent into a high-pressure reactor, and hydrothermally reacted for 9 hours under the conditions of 5Mpa and 230°C; through the pipeline, the sediment was sent to a high-speed centrifuge washing device for repeated filtration for 3 times, and 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 embodiment is between 20nm and 30nm.

Embodiment 3

[0031] ZrOCl with a total weight of 350g 2 ·8H 2 O, Y 2 o 3 and AL 2 o 3 Dissolve in 1000ml of deionized water at a molar ratio of 89:8:3, add 2000ml of potassium bicarbonate with a concentration of 7% by mass and mix evenly, then add 1.75g ​​of dispersant A15 (acrylic acid ester), and then wash with ultrasonic cleaning equipment for 25 Minutes, sent to the high-pressure reactor, hydrothermal reaction under the conditions of 6Mpa, 240 ° C for 10 hours; through the pipeline, the sediment was sent to the high-speed centrifuge washing equipment for repeated filtration 3 times to remove potassium chloride ions and residual impurities, that is A pure tetragonal phase composite nano-ceramic powder with high crystallinity is obtained.

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

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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 special for ceramic teeth prepared by a spontaneous hydrothermal method. [Background technique] [0002] Zirconia has excellent physical and chemical properties, and is an important structural and functional ceramic material. The crystal transformation and volume change of pure zirconia, if used as structural ceramics and functional ceramic coating materials, will cause excessive thermal stress when subjected to thermal cycles, which will cause cracking and peeling off of ceramic products or coatings. Adding some special elements to zirconia will completely change this situation, increasing the toughness and thermal shock performance of the material. Moreover, depending on the types of elements added, the prepared zirconia powder has different uses. So far, domestic enterprises have...

Claims

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Application Information

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