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Preparation method and apparatus of nano porous biologic ceramics

A bioceramic and nanoporous technology, which is applied in ceramic products, bone implants, applications, etc., can solve the problem of microwave sintering hindered hot spots, thermal runaway of cracking and non-uniform heating, pore size that cannot meet the requirements of bone tissue, and complicated thermal insulation chamber devices. and other problems, to achieve the effect of uniform grain size distribution, reduced drying process and small grain size

Inactive Publication Date: 2007-03-14
SICHUAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the grain size of the porous ceramic obtained in this research is 280nm, which does not reach the nanometer size (<100nm), and the pore size of the obtained sample cannot meet the requirement of 100μm-400μm for bone tissue growth.
[0007] Compared with conventional sintering, microwave sintering has shown obvious advantages, but microwave sintering has been hindered by problems such as hot spots, cracks, thermal runaway and non-uniform heating, and the insulation chamber device set up to prevent the above problems is complicated.

Method used

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  • Preparation method and apparatus of nano porous biologic ceramics
  • Preparation method and apparatus of nano porous biologic ceramics

Examples

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Embodiment 1

[0031] Measure 160ml of 1.0M calcium nitrate solution into a 400ml beaker, control the reaction temperature at 60°C, add ammonia water dropwise to adjust the pH value to 9.0, then add concentrated ammonia water and 1.0M phosphoric acid dropwise under constant stirring 100 ml of diammonium hydrogen solution to maintain the pH at 9.0. After the addition, stop and stir for 30 minutes, let stand and age for 24 hours (keep the reaction temperature unchanged), and centrifugally wash the powder until the pH value is 7.0. Add about 10 ml of 5% hydrogen peroxide and 1 g of polyethylene glycol to the powder slurry to make a flowable slurry, move it into a mold and place it in an oven for molding at a molding temperature of 30-120°C. The porous green body can be obtained by demolding and biscuiting at 400°C.

[0032] The porous green body is placed in the SiC sintering container, and the SiC powder is used as the sintering medium, and the microwave sintering is carried out in the air at...

Embodiment 2

[0034] Take about 10 grams of commercial nano-scale titanium dioxide powder, add about 10 grams of water to make a slurry, and add about 5 ml of 5% hydrogen peroxide and 1 gram of polyvinyl alcohol to the slurry to make a flowable slurry, and transfer it to The molds are placed in an oven for molding, and the molding temperature is 30-120°C. The porous green body can be obtained by demolding and biscuiting at 400°C.

[0035] The porous green body is placed in a SiC sintering container, and titanium dioxide powder is used as a sintering medium for microwave sintering in an air atmosphere. The heating rate was set at 30°C / min. After the temperature rose to 900°C, the temperature was kept for 5 minutes. The cooling rate was set at 80°C / min. After the sample was cooled to room temperature, the porosity of the sample was measured to be 60%. The compressive strength is about 18MPa, and the grain size is 50-70nm.

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Abstract

The present invention discloses the preparation process and apparatus for nanometer porous bioceramic. Slurry with nanometer structure is synthesized and centrifugally separated to form thick slurry; the thick slurry is added with foaming agent and formed into the initial blank; the initial blank is plasticized, and microwave sintered at 800-1400 deg.c for 0.5-30 min in the temperature raising rate of 25-200 deg.c / min; and the sintered product is cooled in the temperature lowering rate of 50-200 deg.c / min to room temperature to obtain the bioceramic product with nanometer structure. The preparation process is fast, simple and cheap, and the prepared bioceramic material has high bioactivity and high mechanical performance.

Description

1. Technical field [0001] The invention relates to a preparation method and device of nanoporous bioceramics. 2. Background technology [0002] The preparation of ceramic samples involves many processes such as synthesis, drying, homogenization, injection molding, molding, and sintering. Among them, the agglomeration of powders is inevitable during the synthesis and drying of powders, and the growth of grains exists during sintering. [0003] At present, the preparation of all bioceramic samples starts from the synthesis of dried powders. After the powders are dried, the nano-sized particles in the solution will be agglomerated into micron-sized or even larger particles; in addition, the sintering of the samples is often The muffle furnace is used for sintering, which is characterized in that the powders obtained after various synthesis are formed into dense or porous green bodies according to different molding methods, and then sintered at high temperature for at least 2 ho...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/10C04B35/447C04B38/02A61F2/28
Inventor 王辛龙范红松张兴栋顾忠伟
Owner SICHUAN UNIV
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