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a kind of si 3 no 4 /sic composite wave-absorbing ceramics and preparation method thereof

A technology of ceramics and graphene, applied in the field of Si3N4/SiC composite wave-absorbing ceramics and its preparation, to achieve excellent performance and avoid graphitization

Active Publication Date: 2020-12-25
嘉兴睿创新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But for Si 3 N 4 There are relatively few studies on / SiC composite absorbing ceramics, and the performance of the prepared composite materials needs to be further improved

Method used

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  • a kind of si <sub>3</sub> no <sub>4</sub> /sic composite wave-absorbing ceramics and preparation method thereof
  • a kind of si <sub>3</sub> no <sub>4</sub> /sic composite wave-absorbing ceramics and preparation method thereof
  • a kind of si <sub>3</sub> no <sub>4</sub> /sic composite wave-absorbing ceramics and preparation method thereof

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Embodiment 1

[0027] Si 3 N 4 Powder (average particle size is 300nm), SiC powder (average particle size is 200nm), graphene and absolute ethanol are mixed according to a certain mass ratio (95: 5: 0.3: 20), magnetic stirring and Ultrasonic dispersion for 20 minutes to obtain a mixed slurry; then put the mixed slurry into a polytetrafluoroethylene tank for planetary ball milling for 12 hours, the ball milling medium is silicon nitride balls, and the dispersant is 1wt% polyethylene glycol; the slurry after ball milling Put the material into a vacuum drying oven and dry at 80°C for 2 hours to obtain a mixed powder; then pass through a 200-mesh sieve after granulation and aging for 24 hours; weigh a certain amount of mixed powder, use a tablet press to preform samples, and reuse The cold isostatic press was held at 200 MPa for 2 minutes; the preparation of Si 3 N 4 / SiC green body. The green body was sintered at 1750°C and 4MPa for 2h under the protective condition of high-purity nitrogen...

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Abstract

The invention relates to Si3N4 / SiC composite wave-absorption ceramic and a preparation method thereof and belongs to the technical field of wave-absorption permeable ceramic composite material preparation. The composite wave-absorption ceramic has the phase constitution of Si3N4, SiC and graphene, wherein the mass ratio of Si3N4 to SiC to graphene is 95:5:(0-0.3). The graphene is adopted to modifythe Si3N4 / SiC composite wave-absorption ceramic, and thus a Si3N4 / SiC composite wave-absorption ceramic material with excellent properties can be prepared; compared with Si3N4 / SiC composite wave-absorption ceramic prepared by using other sintering processes, the Si3N4 / SiC composite wave-absorption ceramic is free of reaction of raw materials in the preparation process, and by strictly controllingraw material proportioning and sintering preparation conditions, the graphene is prevented from graphitization.

Description

technical field [0001] The present invention relates to a Si 3 N 4 The invention relates to / SiC composite wave-absorbing ceramics and a preparation method thereof, which belong to the technical field of preparation of wave-absorbing and wave-transmitting ceramic composite materials. Background technique [0002] SiC powder wave absorbing agent has the characteristics of wide absorption frequency band, good oxidation resistance, and stable performance at high temperature. It is a dielectric loss type wave absorbing agent. After N is doped in SiC powder, the solid-solution N atoms in the SiC lattice replace the C atoms to form lattice defects. Since N is trivalent, it can only form bonds with three Si atoms, and the other Si atom will remain one The valence electrons, which cannot form bonds, form a negatively charged defect. This electron can move on the four Si atoms around the N atom, and the position of the electron in the electromagnetic field will also be displaced as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/584C04B35/622C04B35/634
CPCC04B35/584C04B35/622C04B35/63404C04B2235/3826C04B2235/425C04B2235/6562C04B2235/6567C04B2235/658C04B2235/96
Inventor 李庆刚王志史国普黄世峰程新
Owner 嘉兴睿创新材料有限公司