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An ultra-high-porosity hafnium-tantalum-niobium ternary carbide ultra-high temperature thermal insulation material and its preparation method

A ternary carbide and thermal insulation material technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of high thermal conductivity, low strength, low porosity of porous materials, etc., to achieve high porosity, High product performance and excellent ultra-high temperature resistance

Active Publication Date: 2022-01-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of most porous ultra-high temperature ceramics focuses on ZrB 2 , ZrC porous ceramics and ZrB 2 - SiC, ZrC-SiC porous composite materials, the main problems include: 1. The porosity of the porous material is low (65% to 90%); 2. The thermal conductivity is high; 3. The strength is low

Method used

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  • An ultra-high-porosity hafnium-tantalum-niobium ternary carbide ultra-high temperature thermal insulation material and its preparation method
  • An ultra-high-porosity hafnium-tantalum-niobium ternary carbide ultra-high temperature thermal insulation material and its preparation method
  • An ultra-high-porosity hafnium-tantalum-niobium ternary carbide ultra-high temperature thermal insulation material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this example, the preparation method of the ultra-high-porosity hafnium-tantalum-niobium ternary carbide ultra-high temperature insulation material is as follows:

[0030] 1) Preparation of ceramic slurry: Weigh 21 grams of deionized water, 2.5 grams of polyacrylic acid, and 140 grams of hafnium carbide, tantalum carbide and niobium carbide mixed powder with a molar ratio of 1:2:3, add them in sequence and stir After 3 hours, a slurry with evenly dispersed ceramic particles is formed; among them, the original particle size of the raw material hafnium carbide powder is 0.5-1.5 μm, the original particle size of the raw material tantalum carbide powder is 2-3 μm, and the original particle size of the raw material niobium carbide powder is 2-3 μm ; After ball milling for 10 hours, the average particle size of the mixed powder is about 1 μm.

[0031]2) Foaming-gel injection molding: heat the above slurry to 38°C, add 3 grams of sodium lauryl sulfate, and stir and foam at ...

Embodiment 2

[0036] In this example, the preparation method of the ultra-high-porosity hafnium-tantalum-niobium ternary carbide ultra-high temperature insulation material is as follows:

[0037] 1) Preparation of ceramic slurry: Weigh 45 grams of deionized water, 2 grams of ammonium citrate, and 85 grams of mixed powder of hafnium carbide, tantalum carbide and niobium carbide at a molar ratio of 1:1:2, and add them in sequence. Stir for 2 hours to form a slurry with evenly dispersed ceramic particles; wherein, the original particle size of the raw material hafnium carbide powder is 0.5-1.5 μm, the original particle size of the raw material tantalum carbide powder is 0.5-1.5 μm, and the original particle size of the raw material niobium carbide powder is 0.5 ~1.5μm; after ball milling for 36 hours, the average particle size of the mixed powder is about 0.7μm.

[0038] 2) Foaming-gel injection molding: heat the above slurry to 50°C, add 1.5 grams of sodium dodecylsulfonate, and stir and foam...

Embodiment 3

[0043] In this example, the preparation method of the ultra-high-porosity hafnium-tantalum-niobium ternary carbide ultra-high temperature insulation material is as follows:

[0044] 1) Preparation of ceramic slurry: Weigh 25 grams of deionized water, 1.5 grams of polyacetimide, and 115 grams of hafnium carbide, tantalum carbide and niobium carbide mixed powder with a molar ratio of 1:1:1, and add in sequence and stirred for 1 hour to form a slurry with evenly dispersed ceramic particles; wherein, the original particle size of the raw material hafnium carbide powder is 0.5-1.5 μm, the original particle size of the raw material tantalum carbide powder is 1-2 μm, and the original particle size of the raw material niobium carbide powder is 1 ~2μm; after ball milling for 24 hours, the average particle size of the mixed powder is about 0.8μm.

[0045] 2) Foaming-gel injection molding: heat the above slurry to 40°C, then add 2 grams of sodium lauryl sulfate, and quickly mechanically ...

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Abstract

The invention relates to the field of ultra-high-temperature heat-insulating materials, in particular to an ultra-high-porosity hafnium-tantalum-niobium ternary carbide ultra-high-temperature heat-insulating material and a preparation method thereof. (Hf x Ta y Nb 1‑x‑y ) In C ternary carbides, the value range of x and y is: 0 <x<1，0<y<1，x+y<1。以碳化铪、碳化钽和碳化铌粉末为原料，以水为分散介质配制陶瓷浆料，然后加热浆料、加入发泡剂并快速搅拌发泡，随后进行注模和冰冻形成坯体，接着真空干燥、坯体脱模和烘箱干燥，最后分别在管式炉和高温碳管炉中进行烧结，制备出具有超高孔隙率(80％～96％)、轻质、低热导率、高强度和耐超高温(>2000℃) porous hafnium tantalum niobium ternary carbide ultra-high temperature insulation material. The invention has low cost and simple process, is suitable for industrialized production, and has very broad application prospects in the field of aerospace ultra-high temperature thermal protection.< / x<1，0<y<1，x+y<1。以碳化铪、碳化钽和碳化铌粉末为原料，以水为分散介质配制陶瓷浆料，然后加热浆料、加入发泡剂并快速搅拌发泡，随后进行注模和冰冻形成坯体，接着真空干燥、坯体脱模和烘箱干燥，最后分别在管式炉和高温碳管炉中进行烧结，制备出具有超高孔隙率(80％～96％)、轻质、低热导率、高强度和耐超高温(>

Description

technical field [0001] The invention relates to the field of ultra-high-temperature heat-insulating materials, in particular to a hafnium-tantalum-niobium ternary carbide porous ceramic heat-insulation material with ultra-high porosity (80%-96%) and ultra-high temperature resistance (>2000°C) and a preparation method thereof . Background technique [0002] With the rapid development of science and technology in the field of aerospace, hypersonic vehicles are flying faster and faster, and the accompanying aerodynamic heating effect is becoming more and more significant, which can raise the temperature of key parts of the vehicle to the ultra-high temperature range (>2000°C) . Therefore, efficient thermal protection against aerodynamic heat is one of the key technologies for the development of hypersonic vehicles. In the face of the demand for ultra-high temperature insulation, the conventional fiber-based insulation tiles that can withstand temperatures up to 1500 °C ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/10C04B38/00C04B35/56
CPCC04B38/10C04B38/0045C04B35/5607C04B2235/3839C04B2235/96
Inventor 王京阳吴贞梁显鹏邵卓杰孙鲁超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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