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Light wave-transparent ceramic thermal insulation material and preparation method thereof

A heat insulation material and wave-transmitting technology, applied in the field of composite materials, can solve the problems of increased dielectric constant and loss, low dimensionality, long manufacturing cycle, etc., and achieve excellent dielectric properties, good shape maintenance, and good shape short cycle effect

Pending Publication Date: 2021-03-26
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the ultra-fine glass fiber mat has low mechanical strength and low dimensionality, resulting in unstable wave transmission performance
Fiber-reinforced airgel materials have excellent thermal insulation performance due to their unique pore structure, but more raw materials are used in the molding process, the manufacturing cycle is long and the operation is complicated, and the impurity content inside the product is uncontrollable
In fact, most fiber-reinforced aerogels have a higher density, resulting in increased dielectric constant and loss
Therefore, the above three materials alone cannot meet the requirements of high wave-transparent materials.

Method used

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  • Light wave-transparent ceramic thermal insulation material and preparation method thereof
  • Light wave-transparent ceramic thermal insulation material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Mix chopped quartz fibers and water at a mass ratio of 100:1, put them into a dispersion bucket, set the dispersion speed at 3000r / min and disperse for 20min to obtain preliminary dispersed fibers.

[0027] (2) Add water to the initially dispersed fibers so that the mass ratio of short fibers to water after dispersion is 1:50, then add 2 wt% boron nitride relative to the short fiber mass, and set the dispersion speed to 2000r / min Disperse again for 2h to obtain fiber slurry.

[0028] (3) Pour all the prepared fiber slurry into the material forming tooling (the inner cavity size is 300×300mm), then open the water valve, set the water valve gear to 3, and wait for the water in the slurry to flow out; After curing, remove the tooling, press the preliminarily formed embryo body, and control the material density to 0.1g / cm by controlling the thickness of the press 3 , to prepare a wet billet of thermal insulation material.

[0029](4) Hold the wet billet of the heat in...

Embodiment 2

[0032] (1) Mix chopped quartz fibers and water at a mass ratio of 100:5, put them into a dispersion bucket, set the dispersion speed at 2000r / min and disperse for 30min to obtain preliminary dispersed fibers.

[0033] (2) Add water to the initially dispersed fibers so that the mass ratio of short fibers to water after dispersion is 1:100, then add 2 wt% boron nitride relative to the short fiber mass, and set the dispersion speed to 2000r / min Disperse again for 3 hours to obtain fiber slurry.

[0034] (3) Pour all the prepared fiber slurry into the material forming tooling, open the water valve, set the water valve gear to 4, and wait for the water in the slurry to flow out; remove the tooling after it becomes regular, and conduct a preliminary The formed embryo body is pressed, and the material density is controlled to 0.1g / cm by controlling the pressing thickness 3 , to prepare a wet billet of thermal insulation material.

[0035] (4) Hold the wet billet of the heat insulat...

Embodiment 3

[0038] (1) Mix chopped quartz fibers and water at a mass ratio of 10:1, put them into a dispersion bucket, set the dispersion speed at 1000r / min and disperse for 40min to obtain preliminary dispersed fibers.

[0039] (2) Add water to the initially dispersed fibers so that the mass ratio of short fibers to water after dispersion is 1:100, then add 2 wt% boron nitride relative to the short fiber mass, and set the dispersion speed to 2000r / min Disperse again for 3 hours to obtain fiber slurry.

[0040] (3) Pour all the prepared fiber slurry into the material forming tooling, open the water valve, set the water valve gear to 6, and wait for the water in the slurry to flow out; remove the tooling after it becomes regular, and conduct a preliminary The formed embryo body is pressed, and the material density is controlled to 0.1g / cm by controlling the pressing thickness 3 , to prepare a wet billet of thermal insulation material.

[0041] (4) Hold the wet billet of the heat insulati...

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Abstract

The invention relates to a light wave-transparent ceramic thermal insulation material and a preparation method thereof. Specifically, the invention relates to a preparation method of a light wave-transparent ceramic thermal insulation material, which comprises the following steps: dispersing short fibers by a semi-dry mixing method, dispersing the short fibers by a wet process, forming a thermal insulation material wet blank, and drying, sintering and further performing moisture-proof treatment to obtain the light wave-transparent ceramic thermal insulation material with excellent density, heat conductivity coefficient and dielectric property. The invention also relates to the light wave-transparent ceramic thermal insulation material prepared by the method. The material is especially suitable for being used as a wave-transparent thermal insulation integrated material in aerospace crafts.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a lightweight wave-transparent ceramic heat-insulating material and a preparation method thereof. Background technique [0002] The wave-transparent and heat-insulating materials provide guarantee for the normal operation of the communication, telemetry, guidance, detonation and other systems of the aircraft in harsh environmental conditions. With the improvement of the flight Mach number and flight time of aircraft, the performance requirements for wave-transparent and heat-insulating materials for radome / antenna window are increasing. Generally speaking, heat-insulating and wave-transmitting materials should meet the following characteristics: excellent dielectric properties (as small as possible the dielectric constant ε and loss tangent value), light weight, sufficient mechanical strength at high temperature and appropriate elastic modulus, good Excellent thermal shock, he...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/622
CPCC04B35/80C04B35/622C04B2235/5228C04B2235/386C04B2235/5224C04B2235/77C04B2235/9607C04B2235/96
Inventor 张鸶鹭孙景景张凡张丽娟李文静张昊杨洁颖赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH