Microwave attenuation ceramic and preparation method thereof

A microwave attenuation and ceramic technology, applied in the field of wave absorbing materials, can solve the problems of low thermal conductivity, uneven distribution of attenuation phases, and obstacles to the use of high-power tubes, and achieve low elastic modulus, improved sintering density, and enhanced microwave Effect of Attenuating Ability

Inactive Publication Date: 2018-09-11
CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a microwave attenuating ceramic and its preparation method in view of the uneven distribution of the attenuating phase and the low thermal conductivity of the existing microwave attenuating ceramics, which hinder the use of high-power tubes.

Method used

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  • Microwave attenuation ceramic and preparation method thereof

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Effect test

example 1

[0027] Take 150g of boric acid, add 1.2L of deionized water, stir and heat at 300r / min to 50°C, then add 300g of urea and heat up to 60°C, continue to stir for 30min and then evaporate to dryness under reduced pressure to obtain the precursor, place the precursor in In a muffle furnace, under a nitrogen atmosphere, heat up to 800°C at a rate of 20°C / min and calcinate for 3 hours, take out the product after cooling to room temperature, wash the product once with 1% hydrochloric acid, and then wash the product 1 with absolute ethanol After washing, transfer it to a drying oven and dry at 80°C for 6 hours to obtain nanosheet layered boron nitride. Take 1g of yttrium nitrate, 1g of calcium nitrate, 200g of aluminum nitrate, and 20g of glucose in 300mL of deionized water. / min and stirred for 30 minutes, then placed on a rotary evaporator and evaporated to dryness under reduced pressure to obtain a solid powder, which was placed in a muffle furnace and calcined at a rate of 20 °C / mi...

example 2

[0029] Take 180g of boric acid, add 1.3L of deionized water, stir and heat at 350r / min to 55°C, then add 350g of urea and heat up to 65°C, continue stirring for 35min and evaporate to dryness under reduced pressure to obtain a precursor, place the precursor in In a muffle furnace, under a nitrogen atmosphere, heat up to 850°C at a rate of 20°C / min and calcinate for 5 hours, take out the product after cooling to room temperature, wash the product once with 1% hydrochloric acid, and then wash the product 1 with absolute ethanol After washing, transfer it to a drying oven and dry at 85°C for 7 hours to obtain nanosheet layered boron nitride. Take 2g of yttrium nitrate, 1g of calcium nitrate, 250g of aluminum nitrate, and 30g of glucose in 400mL of deionized water. / min and stirred for 35 minutes, then placed on a rotary evaporator and evaporated to dryness under reduced pressure to obtain a solid powder, which was placed in a muffle furnace and calcined at a rate of 20 °C / min to 6...

example 3

[0031]Take 200g of boric acid, add 1.5L of deionized water, stir and heat at 400r / min to 60°C, then add 400g of urea and heat up to 70°C, continue to stir for 40min, then evaporate to dryness under reduced pressure to obtain a precursor, place the precursor in In a muffle furnace, under a nitrogen atmosphere, heat up to 900°C at a rate of 20°C / min and calcinate for 6 hours, take out the product after cooling to room temperature, wash the product twice with 1% hydrochloric acid, and then wash the product 2 with absolute ethanol After washing, transfer it to a drying oven and dry at 90°C for 8 hours to obtain nanosheet layered boron nitride. Take 3g of yttrium nitrate, 2g of calcium nitrate, 300g of aluminum nitrate, and 40g of glucose in 500mL of deionized water. / min and stirred for 40 minutes, then placed on a rotary evaporator and evaporated to dryness under reduced pressure to obtain a solid powder, which was placed in a muffle furnace and calcined at a rate of 20 °C / min to ...

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Abstract

The invention relates to microwave attenuation ceramic and a preparation method thereof and belongs to the technical field of wave absorption materials. By ball-milling aluminum nitride powder and dispersing the powder into interlayers of nano-lamella boron nitride to form contact points, a framework material, which has high heat conductivity, moderated dielectric constant, excellent chemical andthermal stabilities and very high resistivity, can be formed; meanwhile, because molybdenum has excellent heat and electric conductivities and is approximate to aluminum nitride in expansion coefficient, dielectric loss of the material can be increased by uniformly distributing electric conductive granules such as molybdenum in the ceramic material, so that the material has excellent thermal performances, such as high heat conductivity, low elasticity modulus and low heat-expansion coefficient, thereby preparing the novel microwave attenuation material having excellent comprehensive performances. The ceramic is sintered compactly and hardly has pores. When being acted with microwave, the material having irregular crystalline grain appearance can increase absorption and scattering area andimprove the microwave attenuation performance.

Description

technical field [0001] The invention relates to a microwave attenuating ceramic and a preparation method thereof, belonging to the technical field of wave-absorbing materials. Background technique [0002] Microwave attenuating material is a functional material that can absorb electromagnetic waves, convert them into heat energy and transport them outside the body of the material or make electromagnetic waves disappear due to interference, and have little reflection, scattering and projection of electromagnetic waves. In recent years, microwave attenuating materials with high thermal conductivity have attracted extensive attention of researchers. [0003] With the rapid development of modern electronic technology, microwave electric vacuum devices are developing in the direction of miniaturization, light weight, high integration, high reliability, and high power output, which urgently requires high thermal conductivity microwave attenuation materials as bulk attenuation Key...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/581C04B35/622C04B35/626H01P1/22
CPCC04B35/581C04B35/622C04B35/6265C04B35/62675C04B2235/3217C04B2235/3826C04B2235/404C04B2235/445C04B2235/5454C04B2235/602C04B2235/656C04B2235/666C04B2235/9607H01P1/22
Inventor 黄名名王文新朱华
Owner CHANGZHOU SIYU ENVIRONMENTAL PROTECTION MATERIAL SCI & TECH
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