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A method for preparing ceramics using micro-nano particle size grading

A micro-nano and ceramic technology, which is applied in the field of micro-nano powder grading technology to prepare ceramics, can solve the problems that it is difficult to obtain relatively high-density ceramic green bodies and sintered bodies, and cannot effectively improve the comprehensive performance of ceramic materials. Uniform and dense stacking, dense stacking, and performance-enhancing effects

Active Publication Date: 2017-11-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing ceramic powder molding technology is difficult to obtain higher density ceramic green bodies and sintered bodies, and cannot effectively improve the comprehensive performance of ceramic materials

Method used

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  • A method for preparing ceramics using micro-nano particle size grading
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  • A method for preparing ceramics using micro-nano particle size grading

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specific Embodiment approach 1

[0034] Specific implementation mode one: a kind of method of adopting micro-nano particle size gradation to prepare ceramics in the present embodiment, it is carried out according to the following steps:

[0035] 1. Prepare a uniform mixed solution: first dissolve the organic monomer and crosslinking agent in deionized water, adjust the pH value of the solution, and then perform ultrasonic treatment to obtain a uniformly mixed colloidal solution;

[0036] The content of the organic monomer accounts for 2% to 10% of the mass of deionized water;

[0037] The mass ratio of the organic monomer to the crosslinking agent is (8~20):1;

[0038] The pH value is adjusted to 5-12;

[0039] 2. Preparation of single-phase or multi-phase ceramic slurry: to the colloidal solution obtained in step 1, add micro-nano ceramic powder to prepare single-phase ceramic slurry or add micro-nano matrix ceramic powder and second phase micron ceramic powder to prepare Multi-phase ceramic slurry, then a...

specific Embodiment approach 2

[0054] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the monomer described in step 1 is acrylamide, polyoxyethylene ether, polyethylene glycol methacrylate or N,N-dimethyl Acetylacetamide. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0055] Embodiment 3: This embodiment is different from Embodiment 1 in that the crosslinking agent described in step 1 is N,N-methylenebisacrylamide, polyacrylate or diisocyanate. Others are the same as in the first embodiment.

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Abstract

The invention discloses a method for preparing ceramics by micro-nano particle size distribution, which relates to a method for preparing ceramics. The present invention aims to solve the problem that the existing ceramic powder molding technology is difficult to obtain relatively dense ceramic green bodies and sintered bodies, and cannot effectively improve the comprehensive performance of ceramic materials. The method of the invention is as follows: 1. preparing uniform mixed solution; 2. preparing single-phase or multi-phase ceramic slurry; 3. preparing ceramic green body; 4. sintering and densifying; that is, completion. The method of the present invention is based on the centrifugal gel injection molding process in combination with the micro-nano powder gradation problem in the stacking of ceramic particles, and obtains a ceramic material with excellent performance by selecting a suitable particle size gradation ratio. The whole preparation process of the invention has low requirements on equipment and simple operation, and is suitable for centrifugal gel injection molding of different kinds of ceramic materials by adopting gradation technology.

Description

technical field [0001] The invention relates to a method for preparing ceramics by micro-nano powder gradation technology of ceramic materials such as borides, oxides, nitrides and carbides. Background technique [0002] Ceramic materials are widely used in structural or functional materials because of their high melting point, high strength, high modulus, and high temperature resistance. However, since most ceramic materials are strongly covalently bonded and have a low self-diffusion coefficient, it is difficult to sinter and densify ceramic materials, which also limits its application range to a certain extent. Therefore, the preparation of ceramic materials with dense particle stacking, high strength and uniform microstructure is the focus of research at home and abroad. [0003] At present, dry forming and wet forming are mainly used in the preparation method of ceramic green bodies. The cold isostatic pressing method is mainly used in ceramic dry forming, which mainl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/58C04B35/565C04B35/10
Inventor 张东洋胡平桂凯旋张幸红方成
Owner HARBIN INST OF TECH
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