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Biological ceramic and preparation method and application thereof

A bio-ceramic and ceramic powder technology, applied in dental preparations, pharmaceutical formulations, dental prostheses, etc., can solve the problems of low density and uniformity, shrinkage of ceramic body structure, easy to appear glue removal, etc., and reduce linear shrinkage. the effect of increasing density, reducing porosity

Active Publication Date: 2019-02-01
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the field of 3D printing technology, the binder used in the preparation of ceramic slurry is mainly polymer gel, but the polymer gel is prone to debinding during the sintering process, resulting in cracking of the embryo body, large openings, low density and uniformity
For example, 3D gel printing of zirconia parts has been reported so far (Ceramics International, 2017, 7, 124). Although the printed ceramic body structure has a high solid content, the thermal decomposition of the gel makes the ceramic body structure shrink seriously, reaching 17%.

Method used

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  • Biological ceramic and preparation method and application thereof
  • Biological ceramic and preparation method and application thereof

Examples

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preparation example Construction

[0023] The invention provides a method for preparing bioceramics, comprising the following steps:

[0024] (1) mixing aluminum hydroxide and phosphoric acid at 95-105°C to obtain a phosphorus-containing binder;

[0025] (2) mixing the ceramic powder with the phosphorus-containing binder obtained in the step (1) and then ball milling to obtain a ceramic slurry;

[0026] (3) using 3D printing technology to print the ceramic slurry obtained in the step (2) into a ceramic green body;

[0027] (4) Dehydrating and sintering the ceramic body obtained in the step (3) sequentially to obtain bioceramics.

[0028] The invention mixes aluminum hydroxide and phosphoric acid at 95-105 DEG C to obtain the phosphorus-containing binder. In the present invention, the molar ratio of aluminum hydroxide to phosphoric acid is preferably 1:2.5-3.5, more preferably 1:2.8-3.2, more preferably 1:3. In the present invention, the phosphoric acid is preferably an aqueous phosphoric acid solution, and t...

Embodiment 1

[0038] Feed phosphoric acid and aluminum hydroxide in a molar ratio of 3:1, stir at 100°C for 3 hours to obtain a transparent and uniform phosphorus-containing binder, keep mechanically stirring during the reaction, and the final mass of aluminum phosphate in the phosphorus-containing binder The fraction is 15% by weight. Cool the phosphorus-containing binder to room temperature, and then add the yttrium-stabilized zirconia nanopowder into the phosphorus-containing binder in batches, wherein the average grain size of the yttrium-stabilized zirconia nanopowder is 25nm, and the yttrium-stabilized zirconia nanopowder The mass ratio of nano-powder to phosphorus-containing binder is 1:1, and mechanically stirred for 3 hours to obtain a uniform ceramic slurry.

[0039] The ceramic slurry is injected into the barrel of the 3D printer, the printing parameters are adjusted, and the designed ceramic body is printed out using a computer control program. Dry the ceramic body naturally at...

Embodiment 2

[0046] The test was carried out according to the method of Example 1, except that yttrium-stabilized zirconia was replaced by alumina, wherein the mass ratio of alumina nanopowder to phosphorus-containing binder was 0.9:1.

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Abstract

The invention provides a biological ceramic preparation method. The method includes: mixing aluminum hydroxide and phosphoric acid at 95-105 DEG C to obtain a phosphorus-containing adhesive; mixing ceramic powder with the phosphorus-containing adhesive, and performing ball milling to obtain ceramic slurry; printing with the ceramic slurry to obtain a ceramic green body in structural design by a 3Dprinting technique; dewatering the ceramic green body, and sintering to obtain biological ceramic. The biological ceramic prepared according to the method is free of evident surface cracks, high in compactness and uniform in texture, the linear shrinkage is 3.26-5.45%, the porosity is 5-8%, and the apparent density is 2.56-3.12g / cm<3>. According to cytotoxicity tests, cytotoxicity of the biological ceramic is level I and meets biomedical requirements.

Description

technical field [0001] The invention relates to the field of biomedical ceramics, in particular to a bioceramic and its preparation method and application. Background technique [0002] Commonly used bioceramic materials include alumina ceramics and zirconia ceramics. In the repair of hard tissues in biological organisms, compared with traditional metal materials and polymer materials, bioceramic materials have high hardness, stable physical and chemical properties, excellent aesthetic effects and biological Good compatibility and other characteristics. [0003] The traditional preparation methods of ceramics include: powder sintering, gel injection molding, hot pressing sintering, etc. These molding methods limit the structural molding of ceramic materials, especially in clinical oral cavity, which needs to be customized according to the actual condition of the patient, making the traditional Forming methods face enormous challenges. 3D printing technology has significant...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/10C04B35/14C04B35/622C04B35/63B33Y10/00B33Y70/00A61L27/12A61K6/033A61K6/02A61K6/838
CPCA61K6/802A61K6/818A61K6/838A61L27/12B33Y10/00B33Y70/00C04B35/10C04B35/14C04B35/48C04B35/622C04B35/6309C04B2235/6026C04B2235/6562C04B2235/6567C04B2235/661C04B2235/77C04B2235/96
Inventor 王晓龙蒋盼闫昌友张昀周峰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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