A kind of preparation method of nanoparticle toughened high-toughness SIC parts

A nano-particle, high-toughness technology, applied in the field of preparation of high-toughness SiC parts, can solve the problems of inability to achieve uniform dispersion, easy agglomeration and combination of nanoparticles, improve sintering driving force, simple operation equipment, and uncomplicated process flow Effect

Active Publication Date: 2021-08-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention solves the problem that in the process of toughening silicon carbide ceramics with silicon carbide nanoparticles, the nanoparticles are easy to agglomerate and combine and cannot achieve uniform dispersion, and provides a method for preparing SiC parts with high toughness toughened by nanoparticles

Method used

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  • A kind of preparation method of nanoparticle toughened high-toughness SIC parts
  • A kind of preparation method of nanoparticle toughened high-toughness SIC parts
  • A kind of preparation method of nanoparticle toughened high-toughness SIC parts

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specific Embodiment approach 1

[0034] Embodiment 1: In this embodiment, a method for preparing a nanoparticle-toughened high-toughness SiC part is carried out in the following steps:

[0035] 1. Powder pretreatment:

[0036] The silicon carbide micropowder, silicon carbide nanopowder and sintering aid are respectively placed in an oven and dried at a constant temperature to obtain pretreated silicon carbide micropowder, pretreated silicon carbide nanopowder and pretreated sintering aid;

[0037] The particle size of the silicon carbide micron powder is 0.3 μm to 10 μm; the particle size of the silicon carbide nano powder is 1 nm to 200 nm;

[0038] 2. Micron powder dispersion:

[0039] adding the pretreated silicon carbide micron powder and the pretreated sintering aid into deionized water containing the aid, and dispersing evenly to obtain a micron powder slurry;

[0040] The mass ratio of the pretreated silicon carbide micron powder to the pretreated sintering aid is 1:(0.001~0.05); the mass ratio of th...

specific Embodiment approach 2

[0058] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the sintering aid described in step 1 is a mixture of one or more of carbon, boron and boron carbide; the constant temperature described in step 1 The drying temperature is 60°C-120°C, and the drying time is 2h-24h. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0059] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the auxiliary agent described in step two is tetramethylammonium hydroxide, polyvinylpyrrolidone, sodium hydroxymethyl cellulose, polyethylene glycol , phenolic resin, polyvinyl butyral, n-octanol, polyvinyl alcohol and polyacrylamide or a mixture of several. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for preparing a nano-particle toughened high-toughness SiC part, which relates to a preparation method for a high-toughness SiC part. The invention mainly solves the problem that in the existing process of toughening silicon carbide ceramics with silicon carbide nano particles, the nano particles are easy to agglomerate and combine, and uniform dispersion cannot be achieved. Preparation method: 1. powder pretreatment; 2. micron powder dispersion; 3. primary granulation; 4. nanometer encapsulation; 5. secondary granulation; The invention is used for the preparation of nano particle toughened SiC parts with high toughness.

Description

technical field [0001] The invention relates to a preparation method of a high-toughness SiC product. Background technique [0002] As a typical covalent bond compound, 78% of the valence bond energy in silicon carbide belongs to the covalent state, and 22% belongs to the ionic state. This structural characteristic determines that silicon carbide has high strength, high hardness, and stable chemical properties. characteristics, but it also leads to the lack of plastic deformation ability of silicon carbide and high brittleness, which limits the further application of silicon carbide to a certain extent. Strengthening and toughening silicon carbide ceramics can further develop the application potential of silicon carbide ceramics and open up new application scenarios for silicon carbide ceramics. [0003] By introducing silicon carbide nanoparticles in the preparation process of silicon carbide ceramics, the nanoparticles are dispersed in the silicon carbide ceramic matrix, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/626C04B35/628
CPCC04B35/62695C04B35/62834
Inventor 王志江
Owner HARBIN INST OF TECH
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