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A kind of preparation method of nickel silicon carbon nitrogen precursor ceramics

A carbon-nitrogen precursor and ceramic technology, which is applied in the field of preparation of nickel-containing silicon carbon-nitrogen wave-absorbing ceramics, can solve the problems of complex preparation process and poor material wave-absorbing performance, and achieves uniform structure, short preparation period and high temperature performance. Good results

Active Publication Date: 2021-02-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, especially the defects of the current complex preparation process and poor microwave absorption performance of the material, the present invention provides a method for preparing nickel-containing silicon carbon nitrogen (SiCN(Ni)) precursor ceramics by precursor conversion method

Method used

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  • A kind of preparation method of nickel silicon carbon nitrogen precursor ceramics
  • A kind of preparation method of nickel silicon carbon nitrogen precursor ceramics
  • A kind of preparation method of nickel silicon carbon nitrogen precursor ceramics

Examples

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Embodiment 1

[0040] A method for preparing SiCN (Ni) precursor ceramics by a precursor conversion method, comprising steps as follows:

[0041] (1) Mixing: under a nitrogen atmosphere, weigh 4.61g of polysilazane and 0.39g of nano-nickel powder, mix and stir for 20min to obtain a homogeneous mixture;

[0042] The polysilazane: nickel element mass ratio is 92.2wt%: 7.8wt%;

[0043] (2) Pyrolysis / sintering: put the mixture obtained in step (1) into a tube furnace, and under the protection of nitrogen atmosphere, pyrolyze it at a temperature of 1000 °C for 2 hours, and the heating rate is 3 °C / min, to obtain SiCN (Ni ) precursor ceramics.

[0044] The SiCN (Ni) precursor ceramic test X-ray diffraction spectrum, SEM photo, TEM figure, hysteresis loop figure and frequency-reflection loss change curve spectrum of the SiCN (Ni) precursor ceramics prepared in this embodiment, such as figure 1 , 2 , 3, 4, and 5.

[0045] Depend on figure 1 It can be seen that the obtained product mainly contai...

Embodiment 2

[0051] A method for preparing SiCN (Ni) precursor ceramics by a precursor conversion method, comprising steps as follows:

[0052] (1) Mixing: under a nitrogen atmosphere, weigh 4.51g of polysilazane and 0.49g of nano-nickel oxide, mix and stir for 20min to obtain a homogeneous mixture;

[0053] The polysilazane: nickel element mass ratio is 92.2wt%: 7.8wt%;

[0054] (2) Pyrolysis / sintering: put the mixture obtained in step (1) into a tube furnace, and under the protection of nitrogen atmosphere, pyrolyze it at a temperature of 1000 °C for 2 hours, and the heating rate is 3 °C / min, to obtain SiCN (Ni ) precursor ceramics.

Embodiment 3

[0061] A method for preparing SiCN (Ni) precursor ceramics by a precursor conversion method, comprising steps as follows:

[0062] (1) Mixing: under a nitrogen atmosphere, weigh 4.5g of polysilazane and 0.5g of nano-nickel powder, mix and stir for 20min to obtain a homogeneous mixture;

[0063] The polysilazane: nickel element mass ratio is 90wt%: 10wt%;

[0064] (2) Pyrolysis / sintering: put the mixture obtained in step (1) into a tube furnace, and under the protection of nitrogen atmosphere, pyrolyze it at a temperature of 1000 °C for 2 hours, and the heating rate is 3 °C / min, to obtain SiCN (Ni ) precursor ceramics.

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Abstract

The invention relates to a method for preparing nickel-containing silicon-carbon-nitrogen precursor ceramics, which comprises: a step of mixing polysilazane as a raw material and a nickel source; and a pyrolysis step. The invention prepares SiCN (Ni) precursor ceramics through a precursor conversion method, has uniform structure and high strength, and introduces nickel into the SiCN precursor ceramics to increase the loss mechanism of the material, which is beneficial to the improvement of microwave absorption performance. The invention adopts a precursor conversion method, has simple process, convenient operation, low production cost, short preparation period, and the obtained material has strong oxidation resistance, good chemical stability and high temperature performance.

Description

technical field [0001] The invention relates to a preparation method of nickel-containing silicon-carbon-nitrogen wave-absorbing ceramics, belonging to the field of inorganic non-metallic materials. Background technique [0002] In recent years, with the rapid development of communication technology and local area network, etc., it has brought convenience to people's life, but also caused a certain degree of electromagnetic pollution, affecting people's life and work, and even endangering human health; and in In terms of military affairs, the development of advanced detection technologies such as radar has made stealth technology an important research topic in the field of national defense and military affairs. Therefore, electromagnetic absorbing materials have been widely valued due to their important role. The electromagnetic absorbing material converts the incident electromagnetic energy into heat energy and dissipates it through its own absorption and attenuation of el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/591C04B35/589C04B35/622
CPCC04B35/589C04B35/591C04B35/622C04B2235/3279C04B2235/405C04B2235/483
Inventor 龚红宇刘玉张玉军冯玉润林骁郭学毛俊杰
Owner SHANDONG UNIV
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