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A method for preparing layered SIC-based impact-resistant composite ceramic materials by RMI method at low temperature

A composite ceramic and impact-resistant technology, which is applied in the field of low-temperature preparation of layered SiC-based impact-resistant composite ceramic materials by the RMI method, can solve the problems of being unsuitable for industrial production, limited types of layered ceramics, and poor structural designability, etc. Designability, good anti-oxidation performance, and the effect of lowering the preparation temperature

Active Publication Date: 2020-12-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitation of raw material paper and process, the thickness of the prepared substrate is limited, the structure designability is poor, the types of layered ceramics prepared are limited, and the prepared materials have too many residual defects, resulting in low strength and toughness of the materials. , not suitable for industrial production

Method used

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  • A method for preparing layered SIC-based impact-resistant composite ceramic materials by RMI method at low temperature
  • A method for preparing layered SIC-based impact-resistant composite ceramic materials by RMI method at low temperature
  • A method for preparing layered SIC-based impact-resistant composite ceramic materials by RMI method at low temperature

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preparation example Construction

[0042] (1), preparation of casting sheet: adopt casting method to prepare ceramic thin film, ceramic thin film is SiC thin film or TiC thin film or B 4 C film or Si 3 N 4 thin film or Si thin film;

[0043](2) Preparation of layered preform: cutting the ceramic film obtained after drying and demoulding, and designing different layer thickness ratios for alternate lamination to obtain a layered ceramic preform;

[0044] (3) Preparation of ceramic green body: the layered ceramic preform is prepared by dry pressing, low-temperature hot pressing, and cold isostatic pressing;

[0045] (4) Preparation of layered impact-resistant SiC-based composite ceramic material: After the ceramic green body is deglued, it is subjected to high-temperature heat treatment to make it have a corresponding strength, and then RMI is performed to obtain a layered SiC-based impact-resistant ceramic.

[0046] As preferably, the preparation of casting sheet in described step (1) comprises the following ...

Embodiment 1

[0067] as attached figure 1 , 2 , 3, 4, 5 and 6, the RMI method of the present invention prepares the method for layered SiC-based impact-resistant composite ceramic material at low temperature, and the method comprises the following steps:

[0068] (1), the preparation of cast sheet, concrete steps are as follows:

[0069] ①. Add 40kg of SiC powder, 5kg of carbon, 51kg of mixed solution of methyl ethyl ketone and ethanol, and 2kg of triethyl phosphate into the nodular ink tank and mix for 24 hours to obtain a premixed solution. Among them, methyl ethyl ketone and ethanol are mixed at a volume ratio of 1:1; The particle size is 1 μm;

[0070] ②. Add 5kg of polyvinyl butyral, 2kg of glycerol and dioctyl phthalate mixture into the premix and mix for 24 hours to obtain casting slurry, wherein glycerol and dioctyl phthalate are mixed according to Volume ratio 1:1 mixing;

[0071] ③. Vacuum defoaming the casting slurry, and adjust the height of the scraper before and after the ...

Embodiment 2

[0085] as attached Figure 7 Shown, the RMI method of the present invention prepares the method for layered SiC-based impact-resistant composite ceramic material at low temperature, the method comprises the steps:

[0086] (1), the preparation of cast sheet, concrete steps are as follows:

[0087] ①. Add 35kg of SiC powder, 10kg of carbon, 46kg of mixed solution of methyl ethyl ketone and ethanol, and 3kg of triethyl phosphate into a nodular ink tank and mix for 24 hours to obtain a premixed solution. Among them, methyl ethyl ketone and ethanol are mixed at a volume ratio of 2:1; The particle size is 1 μm;

[0088] ②. Add 8kg of polyvinyl butyral, 3kg of glycerol and dioctyl phthalate mixture into the premix and mix for 24 hours to obtain casting slurry, wherein glycerol and dioctyl phthalate are mixed according to Volume ratio 1:2 mixing;

[0089] ③. Vacuum defoaming the casting slurry, and adjust the height of the scraper before and after the casting machine, and obtain t...

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Abstract

The invention relates to a low temperature preparation method for a layered SiC-based anti-shock composite ceramic material by using an RMI method. The method comprises the following steps: preparinga ceramic film by adopting tape casting, cutting the ceramic film obtained after drying and demolding, and stacking alternately to obtain a layered ceramic perform; carrying out dry pressing, low temperature hot-pressing and isostatic cool pressing on the layered ceramic perform to prepare a ceramic biscuit; carrying out high temperature heat treatment, and then carrying out RMI after the ceramicbiscuit is of corresponding strength so as to obtain the layered SiC-based anti-shock ceramic. Compared with the prior art, the layered SiC-based anti-shock composite ceramic material prepared by adopting the RMI method has macroscopic and microcosmic layered toughening and reinforcement improvement effects, and a multi-scale effect is realized; simultaneously, the tape casting is adopted, in combination with a low temperature hot-pressing technology, the gas hole ratio can be effectively reduced, the defects are reduced, the interlayer binding force is strengthened, the strength of the ceramic biscuit is improved, and the material has good popularization and application values.

Description

technical field [0001] The invention belongs to the field of ceramic composite materials, and relates to a method for preparing a layered SiC-based impact-resistant composite ceramic material at low temperature by an RMI method, in particular to a method for preparing a high-strength, high-toughness layered SiC-based impact-resistant composite ceramic by combining a tape casting method and RMI The material method is specifically a method for preparing layered SiC-based impact-resistant composite ceramic materials at low temperature by RMI method. Background technique [0002] Low toughness is one of the common shortcomings of ceramic materials, and layered ceramics can improve the toughness of ceramic materials while ensuring high strength of ceramic materials by referring to the structural design of bionics, forming an energy dissipation structure. Layered ceramics are laminated by two materials with different moduli to achieve modulus matching, thereby improving the toughn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622
Inventor 成来飞孙孟勇范尚武白钰航李明星
Owner NORTHWESTERN POLYTECHNICAL UNIV