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A long-time ablation-resistant ultra-high melting point nitrogen-containing carbide ultra-high temperature ceramic and its application

一种超高温陶瓷、氮碳化物的技术，应用在碳化物陶瓷领域，能够解决耐烧蚀温度低、高温烧蚀损耗快等问题，达到熔点高、效果佳、制备周期短的效果

Active Publication Date: 2021-07-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The new ultra-high melting point ceramics designed and prepared by the present invention overcome the defects of the existing ultra-high temperature ablation-resistant ceramics, such as too low ablation resistance temperature or too fast high-temperature ablation loss; Ablation Protection

Method used

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  • A long-time ablation-resistant ultra-high melting point nitrogen-containing carbide ultra-high temperature ceramic and its application
  • A long-time ablation-resistant ultra-high melting point nitrogen-containing carbide ultra-high temperature ceramic and its application
  • A long-time ablation-resistant ultra-high melting point nitrogen-containing carbide ultra-high temperature ceramic and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to the mass ratio of HfC and HfN powders 3:2, the amount of carbon powder added is 5% of the total mass of the powder, the amount of carbon nitride added is 5% of the total mass of the powder, and ball milled on a planetary ball mill for 15 hours, the powder particle size is 1um, the purity is greater than 99.9%, the ball milling medium is ethanol solution, the rotation speed is 200r / min, the ball-to-material ratio is 8:1, and then placed in a drying oven at 80°C for 10 hours, and the mixed powder is obtained after sieving.

[0038] Place the mixed powder in a graphite mold for spark plasma sintering, the vacuum in the furnace is less than 5Pa, the temperature is raised to 2100°C at a heating rate of 100°C / min, kept for 15 minutes, the pressure is 45Mpa, and then the cooling rate is 100°C / min Let cool to room temperature. Electron probe characterization of the sintered ceramic block showed that the atomic ratio of C and N was 0.60:0.40, resulting in homogeneou...

Embodiment 2

[0040] According to the mass ratio of HfC and HfN powder of 3:1, the amount of carbon powder added is 4% of the total mass of the powder, the amount of carbon nitride added is 6% of the total mass of the powder, ball milled on a planetary ball mill for 20h, and the particle size of the powder is 1um, the purity is greater than 99.9%, the ball milling medium is ethanol solution, the rotation speed is 200r / min, the ball-to-material ratio is 8:1, and then placed in a drying oven at 50°C for 10 hours, and the mixed powder is obtained after sieving.

[0041] Place the mixed powder in a graphite mold for spark plasma sintering, the vacuum in the furnace is less than 5Pa, and the temperature is raised to 2000°C at a heating rate of 100°C / min, kept at a temperature of 40Mpa for 10 minutes, and then cooled at a rate of 100°C / min After cooling to room temperature, a high-purity single-phase face-centered cubic structure ceramic is obtained. Electron probe characterization of the sintere...

Embodiment 3

[0043] According to the mass ratio of HfC and HfN powder 7:1, the carbon powder addition is 5% of the total mass of the powder, the addition of carbon nitride is 5% of the total mass of the powder, ball milled on a planetary ball mill for 20h, and the particle size of the powder is 1um, the purity is greater than 99.9%, the ball milling medium is ethanol solution, the rotation speed is 200r / min, the ball-to-material ratio is 8:1, and then placed in a drying oven at 70°C for 10 hours, and the mixed powder is obtained after sieving.

[0044] Place the mixed powder in a graphite mold for spark plasma sintering, the vacuum in the furnace is less than 5Pa, and the temperature is raised to 2000°C at a heating rate of 100°C / min, kept at a temperature of 45Mpa for 10 minutes, and then cooled at a rate of 100°C / min After cooling to room temperature, a high-purity single-phase face-centered cubic ceramic structure is obtained. Electron probe characterization of the sintered ceramic bloc...

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Abstract

The invention belongs to the technical field of carbide ceramics, and in particular relates to a nitrogen-containing carbide ultra-high temperature ceramic block and its application. The present invention provides for the first time the use of ball milling + spark plasma sintering to prepare HfC with a density greater than or equal to 98% and a uniform C / N content distribution x N y ceramics. The new ultra-high melting point ceramics designed and prepared by the present invention overcome the defects of the existing ultra-high temperature ablation-resistant ceramics, such as too low ablation resistance temperature or too fast high-temperature ablation loss; Ablation protection. Through verification, it is found that after ablation for a long time (300s), the ceramics still maintain a state of near zero ablation rate and a continuous and stable anti-oxidation protection structure.

Description

technical field [0001] The invention belongs to the technical field of carbide ceramics, and in particular relates to a nitrogen-containing carbide ultra-high temperature ceramic block and its application. Background technique [0002] Ultra-high temperature ceramics have the advantages of ultra-high melting point, high-temperature high-strength, and good chemical stability, and are mainly used in ultra-high-temperature extreme environments. The common carbides, nitrides and borides of the fourth subgroup and the fifth subgroup are typical representatives of ultra-high temperature ceramics. At present, hypersonic aircraft is the primary target application field of ultra-high temperature ceramics. When the aircraft flies in the air at more than 5 times the speed of sound, the ultra-high temperature heat flow on its surface due to air resistance poses a severe challenge to the thermal protection system of the aircraft. The heating rate and surface temperature of the nose con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/56C04B35/622C04B35/64
CPCC04B35/5622C04B35/622C04B35/64C04B2235/3886C04B2235/3852C04B2235/422C04B2235/5436C04B2235/666C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/6581C04B2235/96C04B2235/9615C04B35/6261C04B35/6264C04B35/645C04B2235/3839C04B2235/3856C04B2235/77C04B35/58035C04B35/62655C04B2235/9684C04B2235/9669
Inventor 孙威彭峥熊翔
Owner CENT SOUTH UNIV
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