Process for preparing weak interface fiber monolith hafnium boride ceramic by wet spinning and co-extrusion method

A technology of co-extrusion and monolithic boron, which is applied in the direction of wet spinning, spinning solution preparation, artificial filament of inorganic raw materials, etc., can solve the difficulty in forming fiber monolithic precursors, poor toughness of hafnium boride ultra-high temperature ceramics, etc. problem, to achieve the effect of thin diameter, fast dissolution speed and uniform thickness

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

[0006] The purpose of the present invention is to solve the problems of poor toughness of existing hafnium boride ultra-high temperature ceramics and difficulty in forming fiber monolithic precursors, and to provide a process for preparing weak interface fiber monolithic hafnium boride ceramics by wet spinning co-extrusion method

Method used

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  • Process for preparing weak interface fiber monolith hafnium boride ceramic by wet spinning and co-extrusion method
  • Process for preparing weak interface fiber monolith hafnium boride ceramic by wet spinning and co-extrusion method

Examples

Experimental program
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Effect test

Embodiment 1

[0029]1. Preparation of fiber monolithic precursor cell body spinning slurry: First, stir and dissolve 10 grams of polyethersulfone and 1 gram of dioctyl phthalate in 80 grams of N-methylpyrrolidone and 20 grams of acetone, and then add fiber The ceramic powder of the monolithic precursor cell body and the ceramic powder of the fiber monolithic precursor cell body are made by mixing 70 grams of hafnium boride powder and 30 grams of silicon carbide powder according to the mass percentage of 70%: 30%, and stir evenly to make Fiber monolithic precursor cell body spinning slurry;

[0030] 2. Prepare fiber monolithic precursor interface layer spinning slurry: first stir and dissolve 10 grams of polyethersulfone and 1 gram of dioctyl phthalate in 160 grams of N-methylpyrrolidone and 40 grams of acetone, then add The ceramic powder for the interface layer of the fiber monolithic precursor, the ceramic powder for the interface layer of the fiber monolithic precursor is made by mixing ...

Embodiment 2

[0036] 1. Preparation of fiber monolithic precursor cell body spinning slurry: First, stir and dissolve 20 grams of polyethersulfone and 4 grams of dioctyl phthalate in 180 grams of N-methylpyrrolidone and 20 grams of acetone, and then add fiber The ceramic powder of the monolithic precursor cell body and the ceramic powder of the fiber monolithic precursor cell body are made by mixing 90 grams of hafnium boride powder and 10 grams of silicon carbide powder according to the mass percentage of 90%: 10%, and stir evenly to make Fiber monolithic precursor cell body spinning slurry;

[0037] 2. Preparation of fiber monolithic precursor interface layer spinning slurry: first stir and dissolve 20 grams of polyethersulfone and 4 grams of dioctyl phthalate in 450 grams of N-methylpyrrolidone and 50 grams of acetone, then add The ceramic powder for the interface layer of the fiber monolithic precursor, the ceramic powder for the interface layer of the fiber monolithic precursor is made...

Embodiment 3

[0043] 1. Preparation of fiber monolithic precursor cell body spinning slurry: First, stir and dissolve 15 grams of polyethersulfone and 2 grams of dioctyl phthalate in 125 grams of N-methylpyrrolidone and 25 grams of acetone, and then add fiber The ceramic powder of the monolithic precursor cell body and the ceramic powder of the fiber monolithic precursor cell body are made by mixing 80 grams of hafnium boride powder and 20 grams of silicon carbide powder according to the mass percentage of 80%: 20%, and stir evenly to make Fiber monolithic precursor cell body spinning slurry;

[0044] 2. Preparation of fiber monolithic precursor interface layer spinning slurry: first stir and dissolve 15 grams of polyethersulfone and 2 grams of dioctyl phthalate in 350 grams of N-methylpyrrolidone and 50 grams of acetone, then add The ceramic powder for the interface layer of the fiber monolithic precursor, the ceramic powder for the interface layer of the fiber monolithic precursor is mixe...

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Abstract

The invention provides a process for preparing weak interface fiber monolith hafnium boride ceramic by a wet spinning and co-extrusion method. The method is characterized by comprising the following steps of: (1) adding a curing agent and a plasticizer into an organic solvent, stirring for dissolving the curing agent and the plasticizer, respectively adding ceramic powder of a fibrous monolith precursor cell and ceramic powder of a fibrous monolith precursor interfacial layer, uniformly stirring to form two spinneret slurries with different components, spraying the spinneret slurries into a gel tank filled with water through a co-extrusion spinneret under mechanical pressure, and carrying out solidification molding to obtain a fibrous monolith precursor with an interfacial layer; (2) carrying out warm-pressing molding; (3) carrying out vacuum degreasing; and (4) carrying out hot-pressing sintering to obtain the weak interface fiber monolith hafnium boride ceramic, the fracture toughness of which can reach 9 MPa.m<1/2> or above. The process for forming the fibrous monolith precursor through the wet spinning co-extrusion method is simplified, mechanical arrangement is facilitated, the microstructure of the obtained fibrous monolith hafnium boride super-high-temperature ceramic is accurately controlled, the fracture mode is non-brittle fracture, and the performance is excellent.

Description

technical field [0001] The invention provides a process for preparing weak interface fiber monolithic hafnium boride ceramics by a wet-spinning co-extrusion method, which belongs to the technical field of preparation of ultra-high temperature ceramics. Background technique [0002] As an excellent special ceramic material, hafnium boride has the dual characteristics of ceramic and metal, because it has a high melting point (3250 ° C), high hardness and excellent electrical conductivity, thermal conductivity and other properties, it is an ultra-high temperature ceramic with excellent performance Material. However, the fracture toughness of hafnium boride ceramics is low, and the toughness value is only 4-5 MPa·m 1 / 2 , which limits its application in harsh operating environments, such as the nose cone and leading edge of supersonic aircraft, hot-end parts of scramjet engines, etc. Therefore, in order to ensure the reliability and safety during use, it is necessary to improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58C04B35/80C04B35/622C04B35/638C04B35/645C04B35/634C04B35/63D01D5/06D01D1/02D01F9/08
CPCC04B35/58078C04B35/622C04B35/632C04B35/63448C04B35/638C04B35/645C04B2235/3826C04B2235/386C04B2235/6562C04B2235/6567C04B2235/658C04B2235/96D01D1/02D01D5/06D01F9/08
Inventor 王鹏周立娟孟凡涛
Owner SHANDONG UNIV OF TECH
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