Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Graphene oxide reinforced silicon boron carbon nitrogen ceramic composite material and preparation method thereof

A ceramic composite material, silicon-boron-carbon-nitrogen technology, applied in the field of ceramic absorbing materials, can solve the problems of material and air impedance mismatch, weaken electromagnetic wave attenuation, affect the actual performance of composite materials, etc., to increase the dissipation path, enhance Interface polarization effect, good effect of high temperature resistance

Active Publication Date: 2022-03-22
HARBIN INST OF TECH
View PDF13 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the reported conductive filler-modified ceramic composites are prepared by traditional methods such as blending. The conductive fillers are randomly distributed in the ceramic matrix, and a relatively high content is required to form a conductive network, and the above-mentioned conductive fillers are mixed into the ceramic matrix. may lead to an impedance mismatch between the material and the air, therefore, it is very necessary to introduce an appropriate content of conductive filler
In addition, the lamellar or granular structure of the above-mentioned conductive filler has a super large specific surface area and super high specific surface energy, making it very easy to agglomerate or agglomerate in the ceramic matrix, which will greatly affect the actual performance of the composite material and weaken the performance of the composite material. Attenuation of electromagnetic waves

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Graphene oxide reinforced silicon boron carbon nitrogen ceramic composite material and preparation method thereof
  • Graphene oxide reinforced silicon boron carbon nitrogen ceramic composite material and preparation method thereof
  • Graphene oxide reinforced silicon boron carbon nitrogen ceramic composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] Another embodiment of the present invention provides a method for preparing the graphene oxide-reinforced silicon-boron-carbon-nitride ceramic composite material as described above, comprising the following steps:

[0040] S1. Preparation of graphene oxide dispersion: adding graphene oxide into anhydrous dimethylformamide, and ultrasonically dispersing to obtain graphene oxide dispersion;

[0041] S2. Graphene oxide modified polysilaborazane: under an inert atmosphere, add polysilaborazane solution to the graphene oxide dispersion, then add an initiator, ultrasonically disperse, then heat to reflux, and then heat up to 150-250 ° C and heat preservation, curing and cross-linking, to obtain graphene oxide modified polysilaborazane;

[0042] S3. High-temperature pyrolysis: raise the temperature of the graphene oxide-modified polysilaborazane to 1300-1600°C in an inert atmosphere and keep it warm for pyrolysis reaction, and then naturally cool down to room temperature to ob...

Embodiment 1

[0058] A preparation method of graphene oxide reinforced silicon-boron-carbon-nitrogen ceramic composite material, comprising the following steps:

[0059] S1. Preparation of graphene oxide dispersion: ultrasonically clean the round-bottomed flask twice with deionized water and anhydrous dimethylformamide, then add 0.06g of graphene oxide and 10mL of anhydrous dimethylformamide into the round-bottomed flask , put the round-bottomed flask into an ultrasonic machine after being sealed, and ultrasonicate with a power of 220w for 6 hours to obtain a graphene oxide dispersion;

[0060] S2. Graphene oxide modified polysilaborazane: under an inert atmosphere, add 1 g of polysilaborazane solution to the graphene oxide dispersion, then add 0.02 g of dicumyl peroxide, and ultrasonicate with a power of 220w 30min, then heated to reflux at 80°C for 72h, then heated to 190°C at a rate of 5°C / min and kept for 24h to cure and crosslink to obtain a black solid, which is graphene oxide-modifie...

Embodiment 2

[0066] Example 2 is basically the same as Example 1, the difference being that in step S1, 0, 0.04g, 0.06g, and 0.08g of graphene oxide were respectively added to 10mL of anhydrous dimethylformamide, and the preparation concentration was 0g / L , 4g / L, 6g / L, 8g / L graphene oxide dispersion ( Figure 4 respectively corresponding to 4%wt GO, 6%wt GO and 8%wt GO) to carry out subsequent steps S2-S3, and in step S3, the graphene oxide modified polysilicon boron in step S2 is The temperature of azane was raised to 1300°C at a rate of 5°C / min and kept for 2h.

[0067] The electromagnetic wave absorption properties of composites prepared with different concentrations of graphene oxide dispersions are as follows: Figure 4 shown. Depend on Figure 4 It can be seen that the electromagnetic wave absorption performance of the composite material prepared by using the graphene oxide dispersion with a mass concentration of 6%wt is the best, and the mass ratio of graphene oxide to polysilabo...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a graphene oxide reinforced silicon-boron-carbon-nitrogen ceramic composite material and a preparation method thereof, belonging to the technical field of ceramic wave-absorbing materials. The graphene oxide reinforced silicon boron carbon nitrogen ceramic composite material includes silicon boron carbon nitrogen ceramics and graphene oxide dispersed in the silicon boron carbon nitrogen ceramics, and the graphene oxide and the silicon boron carbon nitrogen ceramics are passed through acyl The chemical bonds formed by the oxidation reaction are connected, and the graphene oxide is in a layered structure arranged in parallel. The graphene oxide of the present invention modifies polyborosilazane through acylation reaction, and polyborosilazane is equivalent to intercalation materials distributed between adjacent graphene oxide layers, which increases the gap between adjacent graphene oxide layers. The spacing between the graphene oxide layers destroys the van der Waals force between the graphene oxide layers, and the graphene oxide is bonded to the polyborosilazane, which prevents the uneven dispersion caused by the slippage of graphene oxide and improves the performance of graphene oxide in composite materials. The uniformity of the distribution.

Description

technical field [0001] The invention relates to the technical field of ceramic wave-absorbing materials, in particular to a graphene oxide-reinforced silicon-boron-carbon-nitrogen ceramic composite material and a preparation method thereof. Background technique [0002] With the rapid development of integrated circuit technology and wireless communication systems, electromagnetic radiation of different frequencies floods people's living space, destroys the good ecological environment of human beings, and causes serious electromagnetic pollution. In addition, in the field of national defense and military affairs, global electronic information countermeasures and radar detection and anti-detection research and development and competition are in full swing. On the future battlefield, in order to improve the anti-radar reconnaissance capabilities of fighter jets and other high-speed aircraft, all-round stealth will become a must for future aircraft. capacity. Therefore, the res...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/5835C04B35/622
CPCC04B35/583C04B35/622C04B2235/425C04B2235/486C04B2235/483C04B2235/3826C04B2235/6562C04B2235/6567C04B2235/658C04B2235/96
Inventor 李达鑫陈庆庆贾德昌杨治华蔡德龙周玉高巍
Owner HARBIN INST OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com