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High-strength high-toughness ceramic composite material and preparation method thereof

A ceramic composite material, high-strength and tough technology, applied in the field of ceramic materials, can solve the problems of limited toughening effect of ceramic composite materials, difficulty in being dispersed, and difficult sintering and compacting of ceramic materials, so as to solve the problem of safety in use and improve strength and toughness , a wide range of effects

Active Publication Date: 2021-04-13
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the related technologies mentioned above, the inventor thinks that there are following defects: β-Si 3 N 4 Whiskers are needle-like or fibrous. As a ceramic additive, it is difficult to disperse during use, and will form fluffy flocculent agglomerates of large and small sizes, making it difficult for ceramic materials to be sintered densely, and has a toughening effect on ceramic composite materials. limited

Method used

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  • High-strength high-toughness ceramic composite material and preparation method thereof
  • High-strength high-toughness ceramic composite material and preparation method thereof

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Effect test

Embodiment 1

[0042] Embodiment 1 A method for preparing a high-strength and tough ceramic composite material, comprising the following steps:

[0043] 1) Mixing: Weigh the following raw materials by weight, weigh 500 grams of SiC powder with a median particle size of 2 μm, 500 grams of Si powder with a median particle size of 1 μm, 5 grams of dextrin, and 5 grams of tetramethylammonium hydroxide. gram, 2020 grams of deionized water, put the above various raw materials into a ball mill for ball milling, the ball-to-material ratio is 5:1, and the rotating speed is 30r / min, and ball milling for 5h obtains a mixed slurry.

[0044] 2) Molding: The resulting slurry is spray-dried and granulated. After drying, the average particle size of the pellets is 150 μm. The green body is obtained by dry molding, and the pressing height is limited by a stopper to control the volume of the green body, so that the green body The overall porosity is controlled at 25%.

[0045] 3) In-situ nitriding: put the b...

Embodiment 2

[0051] A method for preparing a high-strength and tough ceramic composite material, comprising the following steps:

[0052] 1) Mixing: Take the following raw materials by weight, B with a median particle size of 50 μm 4 C powder 500g, Si with a median particle size of 50μm 3 N 4 400g powder, 100g Si powder with a median particle size of 30μm, 20g polyvinyl alcohol, 10g dextrin, 10g polyvinyl butyral, 1500g deionized water, put the above raw materials into the mixer , with a rotating speed of 60r / min, stirring for 5h to obtain a mixed slurry.

[0053] 2) Molding: The resulting slurry is spray-dried and granulated. The average particle size of the pellets is 300 μm. The green body is obtained by dry molding. The rate is controlled at 30%.

[0054] 3) In-situ nitriding: put the biscuit into the nitriding furnace, firstly evacuate to 20Pa, then fill with 0.4MPa nitrogen, the nitriding temperature is 1500°C, and the nitriding time is 50 hours. Porous β-Si is obtained after co...

Embodiment 3

[0060] A method for preparing a high-strength and tough ceramic composite material, comprising the following steps:

[0061] 1) Mixing: Weigh the following raw materials by weight, 750 grams of SiC powder with a median particle size of 150 μm, 250 grams of Si powder with a median particle size of 100 μm, 50 grams of methyl cellulose, and 1 gram of n-octanol. 525 grams of ionized water, the above various raw materials are put into a sand mill, the abrasive ratio is 6:1, the rotating speed is 20r / min, sand milling for 5h to obtain a mixed slurry.

[0062] 2) Molding: The obtained slurry is spray-dried and granulated, and the average particle size of the granules is 300 μm, and the green compact is obtained by dry molding, and the pressing height is limited by a stopper, so as to control the volume of the green compact, so that the overall compact The porosity is controlled at about 35%.

[0063] 3) In-situ nitriding: put the biscuit into the nitriding furnace, firstly evacuate ...

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Abstract

The invention relates to the field of ceramic materials, and particularly discloses a high-strength and high-toughness ceramic composite material and a preparation method thereof. The preparation method of the ceramic composite material comprises the steps of weighing ceramic-based powder, elemental Si powder, an adhesive, a dispersing agent and deionized water in proportion, mixing, pulping, molding and preparing into a biscuit, and after the biscuit is subjected to high-temperature nitriding treatment, generating a three-dimensional cross-linked beta-Si3N4 whisker network in situ by the elemental Si powder to obtain a porous beta-Si3N4 / ceramic composite green body; soaking the composite green body into a coupling agent solution for modification treatment, drying, and filling a liquid organic carbon source into pores in the modified composite green body by adopting a soaking process; performing high-temperature vacuum carbonization on the composite green body; and carrying out high-temperature vacuum infiltration on the carbonized green body to obtain Si, reacting the melt Si with residual carbon to generate SiC, and filling residual pores with Si. According to the preparation method of the ceramic composite material provided by the invention, the compact high-strength and high-toughness ceramic composite material can be prepared.

Description

technical field [0001] The application relates to the field of ceramic materials, more specifically, it relates to a high-strength and tough ceramic composite material and a preparation method thereof. Background technique [0002] Ceramic materials have the advantages of high hardness, high strength, high temperature resistance, corrosion resistance and chemical stability, and are widely used in aerospace, communication transmission, mechanical processing, biomedicine, fine chemicals and other fields. However, poor toughness is a common defect of ceramic materials. Toughening modification has always been a difficult problem in the field of engineering ceramics, and it is also an important research direction. The main toughening methods include adding whiskers or fiber toughening, microcrack toughening and phase transformation. Three kinds of toughening. [0003] Ceramic whiskers are small ceramic single crystals with a certain length-to-diameter ratio and few defects, so t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/577C04B35/563C04B35/565C04B35/10C04B35/81C04B35/622C04B35/64
CPCC04B35/565C04B35/563C04B35/10C04B35/622C04B35/64C04B2235/428C04B2235/46C04B2235/5276C04B2235/3882C04B2235/48C04B2235/386C04B2235/422C04B2235/3873C04B2235/402C04B2235/5436C04B2235/5427C04B2235/616C04B2235/96
Inventor 戚明杰邬国平熊礼俊程向前谢方民洪于喆郭岱东
Owner NINGBO VULCAN TECH CO LTD
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