Compact layered silicon carbide ceramic and preparation method thereof

A silicon carbide ceramic and silicon carbide technology, which is applied in the field of preparation of layered ceramics, can solve problems such as limiting the scope of application, and achieve the effects of strong operability, simple method and small degree of deformation.

Active Publication Date: 2021-11-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inherent brittleness of silicon carbide ceramics limits its range of applications as structural components

Method used

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  • Compact layered silicon carbide ceramic and preparation method thereof
  • Compact layered silicon carbide ceramic and preparation method thereof
  • Compact layered silicon carbide ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this embodiment, the weight ratio is respectively 50%: 25%: 5%: 20% of silicon carbide powder with an average particle size of 2 μm, aminophenol-formaldehyde resin, p-toluenesulfonic acid, and absolute ethanol. The mixture is ball milled for 3 hours and filtered. Slurry. Cut the aluminum foil with a thickness of 0.5mm into the required shape and size, apply the hanging slurry evenly on one side, remove the excess slurry with a limit scraper to control the thickness of the slurry to 0.6mm, and semi-cure in an oven after air drying at a temperature of 50 °C for 10 minutes to obtain a single-layer silicon carbide ceramic precursor. Laminate 30 layers of silicon carbide ceramic precursors, and drill holes on the laminated precursors according to the determined aperture size Φ4mm and hole spacing of 10mm. Put the laminated precursor with uniformly drilled holes into a heated mold for high temperature and high pressure curing, the pressure is 12MPa, the temperature is rai...

Embodiment 2

[0049] In this embodiment, the weight ratio is respectively 50%: 20%: 3%: 27% of silicon carbide powder with an average particle size of 7 μm, aminophenol-formaldehyde resin, p-toluenesulfonic acid, and absolute ethanol, which are ball milled for 1 hour and filtered. Slurry. Cut the aluminum foil with a thickness of 0.3mm into the required shape and size, apply the hanging slurry evenly on one side, remove the excess slurry with a limit scraper to control the thickness of the slurry to 0.5mm, and put it in an oven for semi-curing after air drying. 50° C. for 10 minutes to obtain a single-layer silicon carbide ceramic precursor. Laminate 30 layers of silicon carbide ceramic precursors, and drill holes on the laminated precursors according to the determined aperture size Φ4mm and hole spacing of 10mm. Put the laminated precursor with uniformly drilled holes into a heated mold for high temperature and high pressure curing, the pressure is 20MPa, the temperature is raised to 250°...

Embodiment 3

[0051] In this embodiment, the weight ratio is respectively 45%: 25%: 3%: 27% of silicon carbide powder with an average particle size of 2 μm, aminophenol-formaldehyde resin, p-toluenesulfonic acid, and absolute ethanol ingredients, ball milled for 1 hour, and filtered to produce Slurry. Cut the aluminum foil with a thickness of 0.5mm into the required shape and size, apply the hanging slurry evenly on one side, remove the excess slurry with a limit scraper to control the thickness of the slurry to 0.6mm, and semi-cure in an oven after air drying at a temperature of 50 °C for 10 minutes to obtain a single-layer silicon carbide ceramic precursor. Laminate 30 layers of silicon carbide ceramic precursors, and drill holes on the laminated precursors according to the determined aperture size Φ3mm and hole spacing 8mm. Put the laminated precursor with uniformly drilled holes into a heated mold for high temperature and high pressure curing, the pressure is 40MPa, the temperature is ...

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Abstract

The invention relates to a preparation technology of layered ceramic, in particular to a compact layered silicon carbide ceramic and a preparation method thereof. According to the compact layered silicon carbide ceramic, lamellar silicon carbide ceramics are used as basic units, and each basic unit is of a structure with more than three layers connected by discrete silicon carbide ceramic columns in a laminated manner; in the layered silicon carbide ceramic, the relative density of the silicon carbide ceramic basic units and the silicon carbide ceramic columns is greater than or equal to 99%; the silicon carbide ceramic basic units and the silicon carbide ceramic columns are composed of, by weight, 90%-98% of silicon carbide and 10%-2% of silicon, and the average grain size ranges from 50 nm to 50 microns. According to the compact layered silicon carbide ceramic and the preparation method thereof of the invention, the layered structure gaps of the layered silicon carbide ceramic are filled with tough phases(such as metal, polymer and the like), so that when the layered silicon carbide ceramic bears an impact load, the transmission path and the expansion mechanism of cracks can be changed, the sensitivity of the material to the cracks is reduced, and the toughness of the ceramic is further improved.

Description

technical field [0001] The invention relates to the preparation technology of layered ceramics, in particular to a dense layered silicon carbide ceramic and its preparation method. Background technique [0002] Silicon carbide has excellent high hardness, high temperature resistance, oxidation resistance, acid and alkali corrosion resistance, thermal shock resistance and semiconductor characteristics, and has been widely used in the fields of armor protection, wear resistance, ablation resistance and sealing. However, the inherent brittleness of silicon carbide ceramics limits its application range as structural components. Layered silicon carbide ceramics provide sufficient design space for the design of ceramic composites, and are one of the effective methods to achieve toughening of ceramics. [0003] At present, there are several methods for the preparation of layered ceramics: tape casting method, freeze drying method, electrophoretic deposition method, 3D additive man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/591C04B35/622
CPCC04B35/591C04B35/622C04B2235/6562C04B2235/6567C04B2235/48C04B2235/3826C04B2235/428C04B2235/6581C04B2235/786C04B2235/781C04B2235/96
Inventor 张劲松曹小明杨永进金鹏徐奕辰刘强
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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