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Quartz/quartz-boron nitride high-temperature wave-permeable material and preparation method thereof

A technology of high-temperature wave-transmitting and boron nitride, applied in the field of high-temperature wave-transmitting materials and their preparation, can solve problems such as thermal shock resistance and insufficient reliability, and achieve improved mechanical properties and ablation resistance, good bearing capacity, and mechanical properties. and good effect on ablation resistance

Active Publication Date: 2011-08-31
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, existing BN / SiO 2 Composite ceramic wave-transparent materials still have defects such as thermal shock resistance and insufficient reliability

Method used

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  • Quartz/quartz-boron nitride high-temperature wave-permeable material and preparation method thereof
  • Quartz/quartz-boron nitride high-temperature wave-permeable material and preparation method thereof
  • Quartz/quartz-boron nitride high-temperature wave-permeable material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The quartz / quartz-boron nitride high-temperature wave-transmitting material of this embodiment has a chemical formula of SiO 2f / SiO 2 -BN; contains about 45% volume fraction of quartz fibers, about 27% volume fraction of SiO 2 , about 15% volume fraction of BN.

[0024] Preparation:

[0025] (1) Preparation of quartz / quartz ceramic green body

[0026] The silica sol was impregnated into a 2.5D quartz fiber fabric (fiber volume fraction 43%) flat sample (such as figure 1 shown), and then placed in an oil bath at 80°C for 12 hours to complete the sol-gel process; then heated to 200°C, kept for 2 hours, and solidified; finally ceramicized in a muffle furnace at 850°C , holding for 1h, to obtain quartz / quartz ceramics (SiO 2f / SiO 2 ) the initial sample of the green body composite material; repeat the impregnation-sintering process 6 times to obtain a density of about 1.60g / cm 3 , Quartz / quartz ceramic green body with a porosity of about 30%;

[0027] (2) Surface ...

Embodiment 2

[0033] The quartz / quartz-boron nitride high-temperature wave-transmitting material of this embodiment has a chemical formula of SiO 2f / SiO 2 -BN; contains about 45% volume fraction of quartz fibers, about 27% volume fraction of SiO 2 , about 15% volume fraction of BN.

[0034] Preparation:

[0035] (1) Preparation of quartz / quartz ceramic green body

[0036] Immerse the silica sol into a 2.5D quartz fiber fabric flat sample under vacuum conditions, and place it in an oil bath at 80°C for 12 hours to complete the sol-gel process; then heat it to 200°C, keep it warm for 2 hours, and solidify it ; Finally, it was ceramicized in a muffle furnace at 800° C. and kept for 1 hour to obtain a quartz / quartz-boron nitride composite material. The impregnation-sintering process was repeated 9 times.

[0037] Step (2) is the same as step (2) in Example 1;

[0038] Step (3) is the same as step (3) in Example 1.

[0039] The resulting density is about 1.79g / cm 3 of quartz / quartz-boro...

Embodiment 3

[0042] The quartz / quartz-boron nitride high-temperature wave-transmitting material of this embodiment has a chemical formula of SiO 2f / SiO 2 -BN; contains about 45% volume fraction of quartz fibers, about 27% volume fraction of SiO 2 , about 16% volume fraction of BN.

[0043] Preparation:

[0044] Step (1) is the same as step (1) in Example 1;

[0045] Step (2) is the same as step (2) in Example 1;

[0046] (3) Dipping-cracking

[0047] Immerse the saturated ethanol solution of boric acid and urea into the quartz / quartz ceramic green body processed in step (2) under vacuum, and then place it in an oven at 100°C for 10 hours to cure and shape; 2 Under the atmosphere, the ceramicization is completed in the cracking furnace, the cracking temperature is 900°C, and the holding time is 1h to obtain SiO 2f / SiO 2 -Preliminary sample of BN composite material. The impregnation-lysis process was repeated 2 times. The obtained density is about 1.82g / cm 3 of quartz / quartz-boron ...

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Abstract

The invention relates to a quartz / quartz-boron nitride high-temperature wave-permeable material and a preparation method thereof. The chemical formula of the quartz / quartz-boron nitride high-temperature wave-permeable material is SiO2f / SiO2-BN; and the wave-permeable material contains 40-65vol% of quartz fiber (SiO2f), 10-30vol% of SiO2 and 5-15vol% of BN. The preparation method comprises the following steps: firstly, preparing a green quartz / quartz ceramic body from quartz textile and SiO2 sol by a sol-gel process; and then, by using the green quartz / quartz ceramic body as well as boric acid, carbamide and ethanol as raw materials, carrying out vacuum impregnation and non-pressure sintering, thus obtaining the quartz / quartz-boron nitride high-temperature wave-permeable material. The quartz / quartz-boron nitride high-temperature wave-permeable material has favorable ablation resistance, mechanical properties and dielectric properties, and has the advantages of simple preparation process, low cost and fine molding and processing performance.

Description

technical field [0001] The invention relates to a high-temperature wave-transparent material and a preparation method thereof, in particular to a high-strength, ablation-resistant, wave-transparent ceramic matrix composite material for an ultra-high Mach number missile and a preparation method thereof. Background technique [0002] In the past 20 years, driven by the demand for precision-guided aircraft, precision-guided technology has developed rapidly. With the advancement of propulsion technology, the flight speed and reentry speed of the aircraft are getting higher and higher. Some aircraft fly at a speed of more than ten Mach (Ma) in the atmosphere, which makes the aerodynamic load and gas heat on the surface of the aircraft It is getting more and more serious, which in turn makes the electromagnetic guidance device of the aircraft put forward higher requirements on the heat resistance and load-bearing performance of the material for its protective parts—radome / window. ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/622
Inventor 王思青张长瑞曹峰李斌李成虎李端
Owner NAT UNIV OF DEFENSE TECH
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