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A kind of precursor transformation method prepares the method for the SICN (Fe) precursor ceramics of doping rare earth oxide

A technology of rare earth oxides and precursor ceramics, applied in the field of inorganic non-metallic materials, can solve problems such as poor absorption effect, achieve the effects of improving microwave absorption performance, low preparation temperature, and low production cost

Inactive Publication Date: 2019-06-21
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material prepared by this invention has good high-temperature performance and certain microwave absorption performance, but the absorption effect is not good

Method used

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  • A kind of precursor transformation method prepares the method for the SICN (Fe) precursor ceramics of doping rare earth oxide
  • A kind of precursor transformation method prepares the method for the SICN (Fe) precursor ceramics of doping rare earth oxide
  • A kind of precursor transformation method prepares the method for the SICN (Fe) precursor ceramics of doping rare earth oxide

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Experimental program
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Effect test

Embodiment 1

[0051] A method for preparing a SiCN (Fe) precursor ceramic doped with a rare earth oxide by a precursor conversion method, comprising the following steps:

[0052] (1) Mixing: in N 2 Under the atmosphere, weigh 9.8g of polysilazane, 2g of α-methacrylic acid, and 0.2g of dicumyl peroxide, add them into the reaction bottle, and stir on a constant temperature magnetic stirrer for 1h to obtain a single transparent mixed solution;

[0053] The mass ratio of polysilazane in the mixed solution: dicumyl peroxide is 98:2, and the addition amount of the α-methacrylic acid is 20% of the total mass of polysilazane and dicumyl peroxide. %;

[0054] (2) Cross-linking and curing: heat the mixed solution obtained in step (1) in a vacuum tube furnace to make it cross-linking and curing, from room temperature to 600°C for curing for 4 hours, and the heating and cooling rate is 3°C / min;

[0055] (3) crushing and ball milling: get the material obtained in step (2) cross-linked and solidified, ...

Embodiment 2

[0066] A method for preparing a SiCN (Fe) precursor ceramic doped with a rare earth oxide by a precursor conversion method, comprising the following steps:

[0067] (1) Mixing: in N 2 Under the atmosphere, weigh 9.8g of polysilazane, 2g of α-methacrylic acid, and 0.2g of dicumyl peroxide, add them into the reaction bottle, and stir on a constant temperature magnetic stirrer for 1h to obtain a single transparent mixed solution;

[0068] The mass ratio of polysilazane in the mixed solution: dicumyl peroxide is 98:2, and the addition amount of the α-methacrylic acid is 20% of the total mass of polysilazane and dicumyl peroxide. %;

[0069] (2) Cross-linking and curing: heat the mixed solution obtained in step (1) in a vacuum tube furnace to make it cross-linking and curing, from room temperature to 600°C for curing for 4 hours, and the heating and cooling rate is 5°C / min;

[0070] (3) crushing and ball milling: get the material obtained in step (2) cross-linked and solidified, ...

Embodiment 3

[0077] A method for preparing a SiCN (Fe) precursor ceramic doped with a rare earth oxide by a precursor conversion method, comprising the following steps:

[0078] (1) Mixing: in N 2 Under the atmosphere, weigh 9.6g of polysilazane, 2g of α-methacrylic acid, and 0.4g of dicumyl peroxide, add them into the reaction bottle, and stir on a constant temperature magnetic stirrer for 1h to obtain a single transparent mixed solution;

[0079] The mass ratio of polysilazane in the mixed solution: dicumyl peroxide is 96:4, and the addition amount of the α-methacrylic acid is 20% of the total mass of polysilazane and dicumyl peroxide. %;

[0080] (2) Cross-linking and curing: heat the mixed solution obtained in step (1) in a vacuum tube furnace to make it cross-linking and curing, from room temperature to 400°C for curing for 4 hours, and the heating and cooling rate is 3°C / min;

[0081] (3) Crushing and ball milling: take the material obtained in step (2) cross-linking and curing, pr...

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Abstract

The invention relates to a method for synthesizing iron-containing magnetic silicon carbonitride ceramics with doped rare-earth oxide by the aid of precursor conversion. The method includes steps of (1), mixing and stirring polysilazane, alpha-methacrylic acid and dicumyl peroxide with one another to obtain mixed solution; (2), solidifying the mixed solution; (3), carrying out preliminary smashing, smashing and ball-milling and sieving on materials obtained by means of solidifying to obtain powder particles; (4), adding nanometer iron oxide powder and rare-earth oxide powder into the powder particles to obtain mixed materials; (5), carrying out compression molding, cold isostatic pressing and pressure maintaining on the mixed materials to obtain green bodies; (6), sintering the obtained green bodies at the temperatures of 1000-1400 DEG C to obtain the iron-containing magnetic silicon carbonitride ceramics. The method has the advantages that the method includes simple processes and is low in production cost and short in preparation cycle, and products prepared by the aid of the method have high electromagnetic wave attenuation coefficients and are good in microwave absorption property.

Description

technical field [0001] The present invention relates to a preparation method of SiCN(Fe) precursor ceramics doped with rare earth oxides, in particular to a method for synthesizing ferromagnetic silicon carbon nitrogen ceramics doped with rare earth oxides by a precursor conversion method, which belongs to inorganic non-metallic materials field. Background technique [0002] With the development of science and technology, electromagnetic wave radiation has become a major hazard, not only causing damage to daily communication and electronic systems, but also damaging human health. The advancement of detection technology makes it of far-reaching significance to achieve target stealth and improve the survival and penetration capabilities of weapon equipment systems in modern warfare, so electromagnetic shielding technology is very important. Electromagnetic wave absorbing materials can absorb and attenuate incident electromagnetic waves, convert electromagnetic energy into the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/571C04B35/622
CPCC04B35/571C04B35/622C04B2235/3224C04B2235/3272C04B2235/96
Inventor 龚红宇刘玉张玉军冯玉润郭学林骁周立伟
Owner SHANDONG UNIV