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Method for preparing exoskeleton structure fiber monolith zirconium carbide ceramic through wet spinning and co-extrusion

A technology of structural fiber and exoskeleton, which is applied in the field of preparation of ultra-high temperature ceramics, can solve the problems of poor toughness, poor ablation resistance, and difficulty in forming fiber monolithic precursors of zirconium boride ultra-high temperature ceramics, so as to improve the anti-oxidation performance , Improve interface bonding, high strength effect

Inactive Publication Date: 2020-10-30
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problems of poor toughness of existing zirconium boride ultra-high temperature ceramics, difficulty in forming fiber monolithic precursors, and poor ablation resistance of the cell interface of fiber monolithic zirconium carbide ceramics as weak materials, and to provide a wet Fabrication of Exoskeleton Structural Fibrous Monolithic Zirconium Carbide Ceramics by Spun Coextrusion

Method used

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  • Method for preparing exoskeleton structure fiber monolith zirconium carbide ceramic through wet spinning and co-extrusion
  • Method for preparing exoskeleton structure fiber monolith zirconium carbide ceramic through wet spinning and co-extrusion

Examples

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Embodiment 1

[0032] 1. Preparation of fiber monolithic precursor cell body spinneret: First, stir and dissolve 20 grams of polyvinyl butyral and 20 grams of polyethylene glycol in 200 grams of absolute ethanol, and then add the ceramic fiber monolithic precursor cell body Powder, the ceramic powder of the fiber monolithic precursor body is made of 70 grams of boron nitride powder and 30 grams of zirconium carbide powder according to the mass percentage of 70%: 30%. Stir evenly to make the fiber monolithic precursor body spray silk liquid;

[0033] 2. Prepare the spinneret for the interface layer of the fiber monolithic precursor cell body: first stir and dissolve 10 grams of polyvinyl butyral and 10 grams of polyethylene glycol in 100 grams of absolute ethanol, and then add the fiber monolithic precursor cell body The ceramic powder of the interface layer, the ceramic powder of the fiber monolith precursor cell body interface layer is made of 70 grams of zirconium carbide powder and 30 gra...

Embodiment 2

[0039] 1. Preparation of fiber monolithic precursor cell body spinneret: first stir and dissolve 30 grams of polyvinyl butyral and 30 grams of polyethylene glycol in 300 grams of absolute ethanol, and then add the ceramic fiber monolithic precursor cell body Powder, the ceramic powder of the fiber monolithic precursor body is made of 90 grams of boron nitride powder and 10 grams of zirconium carbide powder according to the mass percentage of 90%: 10%. Stir evenly to make the fiber monolithic precursor body spray silk liquid;

[0040] 2. Prepare the spinneret for the interfacial layer of the fiber monolithic precursor cell body: first stir and dissolve 20 grams of polyvinyl butyral and 20 grams of polyethylene glycol in 200 grams of absolute ethanol, and then add the fiber monolithic precursor cell body The ceramic powder of the interface layer, the ceramic powder of the fiber monolith precursor cell body interface layer is made of 90 grams of zirconium carbide powder and 10 gr...

Embodiment 3

[0046] 1. Preparation of fiber monolithic precursor cell body spinneret: first stir and dissolve 25 grams of polyvinyl butyral and 25 grams of polyethylene glycol in 250 grams of absolute ethanol, and then add the ceramic fiber monolithic precursor cell body Powder, the ceramic powder of the fiber monolithic precursor body is made of 80 grams of boron nitride powder and 20 grams of zirconium carbide powder according to the mass percentage of 80%: 20%, and stirred evenly to make the fiber monolithic precursor body spray silk liquid;

[0047] 2. Prepare the spinneret for the interface layer of the fiber monolithic precursor cell body: first stir and dissolve 15 grams of polyvinyl butyral and 15 grams of polyethylene glycol in 150 grams of absolute ethanol, and then add the fiber monolithic precursor cell body The ceramic powder of the interface layer, the ceramic powder of the fiber monolith precursor cell body interface layer is made by mixing 80 grams of zirconium carbide powd...

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Abstract

The invention provides a method for preparing exoskeleton structure fiber monolith zirconium carbide ceramic through wet spinning and co-extrusion. The method is characterized by comprising the following steps of: (1) adding a curing agent and a plasticizer into an organic solvent and stirring for dissolving the curing agent and the plasticizer, respectively adding ceramic powder of a fibrous monolith precursor cell and ceramic powder of a cell interface layer, uniformly stirring to form two spinneret slurries with different components, pouring the spinneret slurries into different injectors,and spraying the spinneret slurries into a gel tank through a co-extrusion spinneret under mechanical pressure to obtain an exoskeleton structure fibrous monolith precursor; (2) carrying out warm-pressing molding; (3) carrying out vacuum degreasing; and (4) carrying out hot pressing sintering to obtain the exoskeleton structure fiber monolith zirconium carbide ceramic, the fracture toughness of which can reach 8MPa. M<1 / 2> or above. According to the obtained exoskeleton structure fiber monolith zirconium carbide ceramic, the toughening mode in which strong and weak layers of a biomimetic material are alternately arranged is reserved, meanwhile, the three-dimensional communication structure of a weak material is changed, and the fracture toughness and the oxidation ablation resistance of the material are synergistically improved.

Description

technical field [0001] The invention provides an exoskeleton structure fiber monolithic zirconium carbide ceramic prepared by wet spinning co-extrusion, which belongs to the technical field of ultra-high temperature ceramic preparation. Background technique [0002] Ultra-high-temperature ceramic materials have properties such as oxidation resistance, high melting point, high-temperature mechanical properties and resistance to aerodynamic wear. Among carbide ceramics, ZrC is considered to be a very promising ultra-high temperature material. However, the fracture toughness of ZrC ceramics is low, and the toughness value is only 4-5 MPa•m 1 / 2 , limiting its application in harsh operating environments. Therefore, in order to ensure the reliability and safety during use, the fracture toughness of ZrC ceramics must be improved. Inspired by the microstructure of shells and bamboo in nature, high-temperature-resistant soft materials are added to brittle ceramic materials, and bi...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/638C04B35/645C04B35/80C04B35/634
CPCC04B35/5622C04B35/6342C04B35/63488C04B35/638C04B35/645C04B2235/3813C04B2235/3826C04B2235/386C04B2235/5248C04B2235/6562C04B2235/6567C04B2235/6586C04B2235/96
Inventor 李双孟凡涛董抒华
Owner SHANDONG UNIV OF TECH
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