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High-temperature-resistant low-thermal-conductivity heat-insulating wave-transmitting material and preparation method thereof

A low thermal conductivity, wave-transparent material technology, applied in ceramic products, other household appliances, applications, etc., can solve the problems of dielectric performance deterioration, mechanical properties that cannot meet engineering requirements, poor thermal shock resistance, etc., and achieve excellent dielectric properties. Excellent electrical properties, meeting the requirements of the working environment, and excellent thermal shock resistance

Active Publication Date: 2020-07-14
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The heat-insulating and wave-transmitting materials reported above all have certain deficiencies, for example: SiO 2 The high temperature resistance level of airgel is below 1000 ℃, and it is easy to absorb moisture to cause a sharp deterioration of the dielectric properties; the high temperature resistance lev

Method used

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  • High-temperature-resistant low-thermal-conductivity heat-insulating wave-transmitting material and preparation method thereof
  • High-temperature-resistant low-thermal-conductivity heat-insulating wave-transmitting material and preparation method thereof
  • High-temperature-resistant low-thermal-conductivity heat-insulating wave-transmitting material and preparation method thereof

Examples

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Example Embodiment

[0035] According to a second aspect of the present invention, there is provided a method for preparing a high-temperature-resistant, low-thermal-conductivity, heat-insulating wave-transmitting material, which is used to prepare the high-temperature-resistant, low-thermal-conductivity, heat-insulating wave-transmitting material described in the first aspect, comprising the following steps:

[0036] Step 1, adding ceramic fiber, sintering aid and setting agent into water, stirring and dispersing to obtain fiber slurry, and the mass proportion of setting agent is 10% to 40% of the total mass of ceramic fiber;

[0037] Step 2, pouring the fiber slurry into the mold and dewatering through suction filtration to obtain a wet blank, and then pressurizing the wet blank to a set thickness;

[0038] Step 3, drying the wet blank to obtain a dry blank;

[0039] In step 4, high temperature sintering is performed on the dry blank to obtain a high temperature resistant and low thermal conduct...

Example Embodiment

[0046] Example 1

[0047] (1) According to the mass ratio m of silicon nitride chopped fibers, starch, boron nitride and water 氮化硅短切纤维 :m 淀粉 :m 氮化硼 :m 水 =1:0.2:0.03:40 ratio to prepare fiber slurry;

[0048] (2) Pour the fiber slurry into the mold and obtain a wet blank through suction filtration and dehydration, and then pressurize it on a pressure molding machine to a thickness of 30mm;

[0049] (3) drying the wet blank in an oven at 100°C for 12 h to obtain a dry blank;

[0050] (4) The dry blank is put into a high temperature furnace and sintered at 1200 ℃ for 1 h to obtain a high temperature resistant and low thermal conductivity heat-insulating wave-transmitting material.

[0051] After testing, the density of the above material is 0.24g / cm 3 , the thermal conductivity at room temperature is 0.042W / m·K, the compressive strength at 10% strain is 0.50MPa, and the dielectric constant and dielectric loss at room temperature are lower than 1.32 and 2×10 in the range o...

Example Embodiment

[0053] Example 2

[0054] (1) According to the mass ratio m of silicon nitride chopped fibers, starch, boron nitride and water 氮化硅短切纤维 :m 淀粉 :m 氮化硼 :m 水 =1:0.3:0.03:25 ratio to prepare fiber slurry;

[0055] (2) Pour the fiber slurry into the mold and obtain a wet blank through suction filtration and dehydration, and then pressurize it on a pressure molding machine to a thickness of 30mm;

[0056] (3) drying the wet blank in an oven at 120°C for 8 hours to obtain a dry blank;

[0057] (4) The dry blank is put into a high temperature furnace and sintered at 1200° C. for 3 hours to obtain a high temperature and low thermal conductivity heat-insulating wave-transmitting material.

[0058] After testing, the density of the above material is 0.31g / cm 3 , the room temperature thermal conductivity is 0.049W / m K, the compressive strength at 10% strain is 0.80MPa, and the room temperature dielectric constant and dielectric loss are lower than 1.34 and 2.1×10 in the range of 7-4...

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Abstract

The invention provides a high-temperature-resistant low-thermal-conductivity heat-insulating wave-transmitting material and a preparation method thereof, and belongs to the field of inorganic non-metallic materials. The material is mainly composed of ceramic fibers and contains a large number of pores. The material contains a small amount of ceramic phases converted from a sintering aid, and the ceramic phases are located at the lap joints of the ceramic fibers. The preparation method comprises the following steps: uniformly dispersing the ceramic fibers, the sintering aid and the setting agent in water to obtain slurry, preparing a wet blank by adopting suction filtration dehydration and pressure molding processes, drying the wet blank, and carrying out high-temperature sintering to obtain the high-temperature-resistant low-thermal-conductivity heat-insulating wave-transmitting material. Compared with the conventional common heat-insulating wave-transmitting material, the wave-transmitting material prepared by the invention has the advantages that the high-temperature-resistant grade is greatly improved, and meanwhile, the wave-transmitting material has relatively low volume density, excellent heat-insulating property, good dielectric property and relatively high mechanical strength.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a heat-insulating and wave-transmitting material with high temperature resistance and low thermal conductivity and a preparation method thereof. Background technique [0002] The wave-transparent radome (window) is a key component used to protect the communication, telemetry, guidance, detonation and other systems of aerospace vehicles to work normally in the service environment. system has been widely used. The heat-proof and wave-transmitting materials used to make radome (window) are generally required to have better anti-airflow erosion performance and higher mechanical strength, so higher compactness is often pursued. This kind of compactness leads to high thermal conductivity and relatively poor thermal insulation performance of heat-resistant wave-transmitting materials. However, with the change of people's understanding of future wars, countries all over th...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/584C04B35/622C04B35/64
CPCC04B38/0645C04B38/068C04B35/584C04B35/622C04B35/64C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607C04B38/0067
Inventor 杨海龙孙陈诚李俊宁王晓艳张娟胡子君
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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