Method for preparing ceramic through micro-nano grain-size grading

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

Active Publication Date: 2015-11-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for preparing ceramic through micro-nano grain-size grading
  • Method for preparing ceramic through micro-nano grain-size grading
  • Method for preparing ceramic through micro-nano grain-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 ceramic through micro-nano grain-size grading and relates to a ceramic preparing method. The method aims at solving the problems that in an existing ceramic powder forming technology, high-density ceramic green bodies and sintering bodies are difficult to obtain, and the comprehensive performance of ceramic materials cannot be effectively promoted. The method includes the steps that firstly, an even mixing solution is prepared; secondly, single-phase or multi-phase ceramic slurry is prepared; thirdly, a ceramic body is prepared; fourthly, sintering densification is conducted, and therefore the ceramic is completed. The method is started with the combination of the problem of micro-nano powder grading in ceramic particle stacking under the centrifugal gel-casting technology, and ceramic materials good in performance are obtained by selecting proper particle size grading proportions. According to the method, the requirement for equipment in the whole preparing technology is low, operation is simple, and the method is suitable for centrifugal gel-casting forming of various ceramic materials through a grading 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 Applications(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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