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A high-temperature-resistant, ablation-resistant wave-transparent tip and a preparation method thereof

A technology of anti-ablation and high temperature resistance, applied in the field of wave-transmitting ends, can solve the problems of inability to meet the requirements of high wave transmission of radomes, inability to meet the requirements of precise strikes, and large changes in the aerodynamic shape of radomes. Avoid the effects of large changes in aerodynamic shape, improved performance, and good high temperature resistance

Active Publication Date: 2021-08-03
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of aerospace technology, the flight speed of missiles is getting higher and higher. Some new missiles can fly at speeds up to 20 Ma. The severe aerodynamic heat makes the stagnation temperature of the radome, a key part of the missile, reach above 2500 ° C. The mature quartz fiber reinforced The quartz composite material has a long-term temperature resistance of 800°C. Due to the large ignition loss at the head of the radome, the aerodynamic shape of the radome changes greatly, which cannot meet the requirements of precise strikes.
[0003] At present, relatively mature high-temperature-resistant ceramic matrix composite materials such as C / C and C / SiC-ZrB2 are impermeable to waves and cannot meet the high wave-transparency requirements of radomes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a method for preparing a high-temperature-resistant and anti-ablation wave-transparent tip, the steps of which are as follows:

[0026] (1) Short boron nitride fibers are chopped to a length of 10-20mm;

[0027] (2) The boron nitride fiber is impregnated in the liquid phase of the alcohol-based slurry, and then dried, and the impregnation and drying method is cycled (according to this step for 2-3 times of cycle impregnation) to prepare an interface coating on the boron nitride fiber. The base slurry is an alcoholic solution of boron nitride, the solid content of the alcohol-based slurry is 5-15%, the immersion time is 20-30s, and the drying temperature is 90-100°C;

[0028] (3) Preparation of nitride composite slurry

[0029] A. The nitride slurry is a composite water-based slurry of silicon nitride and boron nitride, silicon nitride (Si 3 N 4 ) and boron nitride (BN) mass ratio is (3-4): (0.9-1), adding Y 2 o 3 Powder or Al 2 o 3 The po...

Embodiment 2

[0039] This embodiment provides a method for preparing a high-temperature-resistant and anti-ablation wave-transparent tip, the steps of which are as follows:

[0040] (1) Short boron nitride fibers are chopped to a length of 20-30mm;

[0041] (2) The boron nitride fiber is impregnated in the liquid phase of the alcohol-based slurry, and then dried, and the impregnation and drying method is cycled (according to this step for 2-3 times of cycle impregnation) to prepare an interface coating on the boron nitride fiber. The base slurry is an alcoholic solution of boron nitride, the solid content of the alcohol-based slurry is 5-15%, the immersion time is 120s, and the drying temperature is 50°C. Follow this step for 2-3 cyclic immersions;

[0042] (3) Preparation of nitride composite slurry

[0043] A. The nitride slurry is a composite water-based slurry of silicon nitride and boron nitride, the mass ratio of silicon nitride and boron nitride is (3-4):0.5, and Y is added 2 o 3 ...

Embodiment 3

[0053] This embodiment provides a method for preparing a high-temperature-resistant and anti-ablation wave-transparent tip, the steps of which are as follows:

[0054] (1) Short boron nitride fibers are chopped, and the cut length is 50-60mm;

[0055] (2) The boron nitride fiber is impregnated in the liquid phase of the alcohol-based slurry, and then dried, and the impregnation and drying method is cycled (according to this step for 2-3 times of cycle impregnation) to prepare an interface coating on the boron nitride fiber. The base slurry is an alcoholic solution of boron nitride, the solid content of the alcohol-based slurry is 5-15%, the immersion time is 80-90s, and the drying temperature is 80-90°C. Follow this step for 2-3 times of cyclic impregnation;

[0056] (3) Preparation of nitride composite slurry

[0057] A. The nitride slurry is a composite water-based slurry of silicon nitride and boron nitride, the mass ratio of silicon nitride and boron nitride is (3-4): 0-0...

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Abstract

The invention relates to a high-temperature-resistant and anti-ablation wave-transparent terminal and a preparation method thereof. The boron nitride fixed-length fiber is mixed with nitride composite slurry, and the high-temperature-resistant and ablation-resistant wave-transparent terminal is prepared through drying and hot-pressing molding processes. The preparation method is pioneered in the field, has pioneering significance, and plays a positive role in promoting the preparation of a high-temperature-resistant, ablation-resistant, and wave-transparent tip with better performance. High temperature resistance and anti-ablation The wave-transparent terminal has good high temperature resistance and anti-ablation performance. Under the plasma ablation test at 2000°C / 200s, the line ablation rate is less than 0.05mm / s, and it can withstand high temperatures above 2500°C, avoiding The phenomenon that the aerodynamic shape of the radome changes greatly due to the large ignition loss at the head of the radome cannot meet the requirements of precise strikes.

Description

technical field [0001] The invention relates to a wave-transmitting terminal, in particular to a method for preparing a high-temperature-resistant and ablation-resistant wave-transmitting terminal. Background technique [0002] With the development of aerospace technology, the flight speed of missiles is getting higher and higher. Some new missiles can fly at speeds up to 20 Ma. The severe aerodynamic heat makes the stagnation temperature of the radome, a key part of the missile, reach above 2500 ° C. The mature quartz fiber reinforced The quartz composite material has a long-term temperature resistance of 800°C, and the aerodynamic shape of the radome changes greatly due to the large ignition loss at the head of the radome, which cannot meet the requirements of precise strikes. [0003] At present, relatively mature high-temperature-resistant ceramic matrix composite materials such as C / C and C / SiC-ZrB2 are impermeable to waves and cannot meet the high wave-transparency req...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/584C04B35/622C04B35/626C04B35/645
CPCC04B35/806C04B35/584C04B35/622C04B35/62605C04B35/645C04B2235/386C04B2235/9607
Inventor 韦其红王洪升栾强邵长涛朱保鑫石江翟萍
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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