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Preparation method of graphene composite silicon-carbon-nitrogen precursor ceramics

A graphene composite and precursor ceramic technology, applied in the field of microwave absorption, can solve the problems such as no reports on graphene composite silicon carbon nitride precursor ceramics.

Active Publication Date: 2018-06-15
SHANDONG UNIV
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  • Application Information

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Problems solved by technology

[0011] So far, there are no reports on graphene composite silicon carbon nitrogen precursor ceramics

Method used

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  • Preparation method of graphene composite silicon-carbon-nitrogen precursor ceramics
  • Preparation method of graphene composite silicon-carbon-nitrogen precursor ceramics
  • Preparation method of graphene composite silicon-carbon-nitrogen precursor ceramics

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Embodiment Construction

[0015] A kind of precursor method prepares the method for graphene composite silicon carbon nitrogen precursor ceramics, comprises steps as follows:

[0016] (1) Mixing: in N 2 Under the atmosphere, stir polysilazane (PSZ) and graphene evenly to obtain a mixed solution;

[0017] The polysilazane: graphene is formulated according to the mass ratio of 60% to 95%: 40% to 5%;

[0018] (2) Cross-linking curing: the mixed solution obtained in step (1) is cured at a heating rate of 3-5°C / min from room temperature to 300-800°C for 1-8 hours;

[0019] (3) Pulverizing and ball milling: pulverizing and ball milling the solidified material obtained in step (2) in a vibrating ball mill, and passing through a 100-200 mesh sieve;

[0020] (4) Granulation molding: press the powder obtained in step (3) under a pressure of 5MPa to 15MPa, cold isostatic pressing, 150 to 250MPa, and hold the pressure for 200 to 400s to obtain a green body;

[0021] (5) heat treatment: the green body obtained i...

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Abstract

The invention relates to a preparation method of graphene composite silicon-carbon-nitrogen precursor ceramics, wherein the preparation method includes the following steps: (1) stirring polysilazane (PSZ) and graphene evenly in an N2 atmosphere to obtain a mixed solution; (2) rising the temperature of the mixed solution obtained by the step (1) with the heating rate of 3-5 DEG C / min from room temperature to 300-800 DEG C, and solidifying for 1-8 h; (3) carrying out crushing ball milling of the material solidified in the step (2) in a vibrating ball mill, and allowing the powder to pass througha 100-200 mesh sieve; (4) carrying out press molding of the powder obtained in the step (3) under the pressure of 5 MPa-15 MPa, carrying out cold isostatic pressing, and under the pressure of 150-250MPa, maintaining the pressure for 200-400 s to obtain a green body; and (5) carrying out heat treatment of the green body obtained in the step (4) under N2 atmosphere protection at the temperature of1000 DEG C-1300 DEG C, carrying out heat preservation for 2 h-6 h, and thus obtaining the product. The graphene material is introduced in the preparation process of a precursor, a real part and a virtual part of the relative complex dielectric constant of the ceramic material obtained by heat treatment are increased, the loss factor is increased and the reflection loss of the material is improved.

Description

(1) Technical field [0001] The invention relates to a preparation method of a graphene composite silicon-carbon-nitrogen precursor ceramic, belonging to the field of microwave absorption. (2) Background technology [0002] Traditional electromagnetic wave absorbing materials have high density, low absorption capacity, and poor impedance matching characteristics. The new wave-absorbing material is developing in the direction of composite wave-absorbing material, that is, by combining the advantages of two types of wave-absorbing media at the same time, the electromagnetic parameters of the material are adjusted, thereby improving impedance matching and broadening the absorption frequency band. In addition, composite light-weight wave-absorbing materials For example, the precursor ceramics can effectively reduce the density of the material, improve the absorbing performance of the material, and meet the needs of "thin, wide, light, and strong" new absorbing materials. [0003...

Claims

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Application Information

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IPC IPC(8): C04B35/584
CPCC04B35/589C04B35/591C04B2235/425C04B2235/96
Inventor 龚红宇冯玉润张玉军郭学刘玉林骁毛俊杰
Owner SHANDONG UNIV
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