Unlock instant, AI-driven research and patent intelligence for your innovation.

Wet-spinning-dipping method to prepare ultra-high temperature ceramics with weak interface fiber monolithic zirconium boride

A technology of ultra-high temperature ceramics and impregnation method is applied in the field of preparation of ultra-high temperature ceramics, which can solve the problems of difficulty in forming fiber monolith precursors, and achieve the effects of reducing deformation and improving compactness.

Active Publication Date: 2022-06-07
SHANDONG UNIV OF TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the difficulty in forming the existing fiber monolithic precursor, and to provide a wet spinning-impregnation method for preparing ultra-high temperature ceramics with weak interface fiber monolithic zirconium boride

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Wet-spinning-dipping method to prepare ultra-high temperature ceramics with weak interface fiber monolithic zirconium boride
  • Wet-spinning-dipping method to prepare ultra-high temperature ceramics with weak interface fiber monolithic zirconium boride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Preparation of fiber monolith precursor: First, 10 grams of polyvinyl butyral and 10 grams of polyethylene glycol are stirred and dissolved in 100 grams of anhydrous ethanol, and then zirconium boride ceramic powder is added, and zirconium boride ceramic powder is added. The powder is made up of 80 grams of 1µm zirconium boride powder and 20 grams of 0.5µm silicon carbide powder mixed in a mass percentage of 80%: 20%, vigorously stirred for 48h to make a spinning liquid, and then the spinning liquid is moved to a stainless steel storage tank , Vacuum degassing for 1h, under 0.2MPa nitrogen pressure, spray the spinneret into the gel tank filled with water through the spinneret, the water temperature of the gel tank is 0 ℃, soak for 8h after solidification and molding, that is, the fiber unique Stone precursor, the diameter of the fiber monolith precursor is 1000µm;

[0025] 2. Coating coating by dipping method: first add 2 grams of carboxymethyl cellulose into 500 gra...

Embodiment 2

[0030]1. Preparation of fiber monolith precursor: First, 20 grams of polyvinyl butyral and 20 grams of polyethylene glycol are stirred and dissolved in 200 grams of anhydrous ethanol, and then zirconium boride ceramic powder is added, and zirconium boride ceramic powder is added. The powder is made by mixing 90 grams of 5µm zirconium boride powder and 10 grams of 2µm silicon carbide powder by mass percentage of 90%: 10%. Stirring vigorously for 48 hours to prepare a spinning liquid, and then transferring the spinning liquid to a stainless steel storage tank. Vacuum degassing for 5h, under 0.5MPa nitrogen pressure, spray the spinneret into the gel tank filled with water through the spinneret, the water temperature of the gel tank is 10 ℃, and soak for 24h after solidification and molding to obtain the fiber monolith The precursor, the diameter of the fiber monolith precursor is 200µm;

[0031] 2. Coating coating by dipping method: first add 5 grams of carboxymethyl cellulose in...

Embodiment 3

[0036] 1. Preparation of fiber monolith precursor: First, stir and dissolve 15 grams of polyvinyl butyral and 15 grams of polyethylene glycol in 150 grams of anhydrous ethanol, and then add zirconium boride ceramic powder, zirconium boride ceramic powder The powder is made by mixing 85 grams of 2µm zirconium boride powder and 15 grams of 1µm silicon carbide powder by mass percentage of 85%: 15%, stirring vigorously for 48 hours to prepare a spinneret, and then transferring the spinneret to a stainless steel storage tank. Vacuum degassing for 2h, under 0.4MPa nitrogen pressure, spray the spinneret into the gel tank filled with water through the spinneret, the water temperature of the gel tank is 5 ℃, and soak for 12h after solidification and molding to obtain the fiber monolith The precursor, the diameter of the fiber monolith precursor is 800µm;

[0037] 2. Coating coating by dipping method: first add 4 grams of carboxymethyl cellulose into 800 grams of deionized water and sti...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
bending strengthaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a wet-spinning-dipping method for preparing ultra-high-temperature ceramics with weak interface fiber monolithic zirconium boride, which is characterized in that the following steps are adopted: 1) the wet-spinning method is used to prepare the fiber monolithic precursor, and the curing agent and the plasticizer are first mixed Stir and dissolve in an organic solvent, then add zirconium boride ceramic powder, stir vigorously to make a spinneret liquid, and then spray the spinneret liquid into the gel tank through the spinneret, solidify and form, and obtain the fiber monolithic precursor ; 2) Coating by dipping method, immersing the fiber monolithic precursor in graphite slurry, and controlling the thickness of the coating by dipping and pulling times; 3) Warm pressing; 4) Vacuum degreasing; 5) Hot pressing sintering, that is Weak interface fiber monolithic zirconium boride ultra-high temperature ceramics, the fracture toughness can reach 8MPa•m 1 / 2 above. The fracture mode of the fiber monolithic zirconium boride ultra-high temperature ceramics obtained in the present invention is non-brittle fracture, that is, successive fracture with a certain tolerance to crack damage, and excellent performance.

Description

technical field [0001] The invention provides a weak interface fiber monolithic zirconium boride ultra-high temperature ceramic prepared by a wet spinning-dipping method, which belongs to the technical field of preparation of ultra-high temperature ceramics. Background technique [0002] Zirconium boride ceramics have excellent high temperature and corrosion resistance properties and relatively low theoretical density, so they have always been considered as one of the most promising materials in the ultra-high temperature ceramics (UHTCs) family. At present, zirconium boride ceramics have been widely used as various high-temperature structural and functional materials, such as turbine blades in the aviation industry, magneto-hydrogen power generation electrodes, etc. However, the fracture toughness of zirconium 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 leadi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622C04B35/638C04B35/645
CPCC04B35/58078C04B35/622C04B35/638C04B35/645C04B2235/3826C04B2235/5248C04B2235/6562C04B2235/6567C04B2235/602Y02E60/36
Inventor 魏春城王鹏李双
Owner SHANDONG UNIV OF TECH