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Nano ceramic water-base gel casting method

A technology of water-based gel injection molding and nano-ceramics, which is applied in the field of water-based gel injection molding of nano-ceramics, can solve the problems of easy agglomeration, large specific surface area and high surface energy of nanoparticles, and achieves convenient industrial production, Simple molding process and high density effect

Inactive Publication Date: 2007-06-13
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the high surface energy and large specific surface area of ​​nanoparticles, it is easy to agglomerate under the action of van der Waals force, and it is difficult to obtain a slurry with high solid content during gel injection molding, so the density of the obtained green body is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the preparation of zirconia nano ceramics

[0021] Preparation of ZrO with an average particle size of 8-12nm by chemical co-precipitation method 2 (3Y) (yttria-stabilized zirconia) ceramic powder, which is ground for later use. Take 10 grams of the above powder, add 2.5ml of water to it, add 0.5 grams of organic monomer acrylamide and 0.05 grams of crosslinking agent N, N'-methylenebisacrylamide, and add 0.12 grams of ammonium polyacrylate as a dispersion agent, and adjusted the pH value to 10 with ammonia water, ultrasonicated for 10 minutes, and then ball milled for 4 hours. Vacuum defoaming the milled slurry for 10 minutes, adding 0.03 g of 10% ammonium persulfate solution and tetramethylethylenediamine solution respectively, and then pouring it into a mold and polymerizing at 40° C. for 30 minutes to obtain a molded body; After the cured green body was removed from the mold, it was cut into thin slices with a thickness of 2 mm, left to stand at room...

experiment example 2

[0023] Experimental example 2: Forming of alumina nano ceramics

[0024] Al with a particle size of 5-10 nm was prepared by polymer network gel method 2 o 3 For the ceramic powder, take 10 grams of the powder, add 3.5ml of water to it, and add 0.2 grams of polyacrylic acid as a dispersant at the same time, and adjust the pH value to 12 with ammonia water. The dried gel injection molded body was pressed unidirectionally in a steel mold with a tablet press, and the pressure was 250 MPa. All the other are with embodiment 1.

[0025] Results: According to relevant performance tests on the prepared ceramic green body, the relative density of the ceramic green body is as high as 51%, and the green body can be sintered at 1400°C for 2 hours to obtain completely dense nano-Al 2 o 3 ceramics.

experiment example 3

[0026] Experimental example 3: Forming of titanium oxide nano ceramics

[0027] TiO with a particle size of 10-15nm was prepared by hydrolysis 2 For the ceramic powder, take 10 grams of the powder, add 3ml of water therein, and add 0.15 grams of polyacrylic acid as a dispersant at the same time, and adjust the pH value to 12 with ammonia water. The dried gel injection molded body was pressed unidirectionally in a steel mold with a tablet press, and the pressure was 250 MPa. All the other are with embodiment 1.

[0028] Results: The related performance test of the prepared ceramic green body found that the relative density of the ceramic green body was as high as 58%. After the green body was sintered at 900°C for 2 hours, fully dense nano-TiO could be obtained. 2 ceramics.

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Abstract

The invention relates to a nano-ceramic water-based gelcasting method. It first models the nano-ceramic powder in the method of gelcasting, and then presses the drying biscuit in the mould to form the model. This invention greatly improves the density of nanometer ceramic biscuit and its microstructure.

Description

technical field [0001] The invention relates to a water-based gel injection molding method for nano ceramics, and mainly relates to a method for preparing nano ceramics by combining water-based gel injection molding and dry pressing molding technology. Background technique [0002] Nanomaterials have attracted widespread attention for more than 20 years because of their extraordinary mechanical, electrical, optical and magnetic properties. With its excellent strength, toughness and superplasticity similar to metals, nano-ceramics show attractive application prospects. However, the preparation of high-density nanoceramics is very difficult. Due to the small grain size and large specific surface area of ​​nano powder, it is easy to introduce defects by traditional molding methods, and it is difficult to distribute the particles inside the green body evenly. The density and uniformity of the green body have an important influence on the subsequent sintering of nano-ceramics, ...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/453C04B35/46C04B35/48C04B35/10B28B1/14
Inventor 张永胜胡丽天胡天昌陈建敏
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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