Inorganic nonmetal composite wave-absorbing material containing graphene nano layer as well as preparation method and application thereof

A technology of graphene nanosheets and composite wave-absorbing materials, which is applied in the field of preparation and application of inorganic non-metallic composite wave-absorbing materials containing graphene nanosheets, to achieve the effect of reducing surface reflection, simple preparation method, and good wave-absorbing performance

Inactive Publication Date: 2010-09-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional wave absorbing agents are difficult to meet the characteristics of "thin, light, wide, and strong". Future wave absorbing materials also need to meet higher requirements such as multi-spectrum stealth,

Method used

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  • Inorganic nonmetal composite wave-absorbing material containing graphene nano layer as well as preparation method and application thereof
  • Inorganic nonmetal composite wave-absorbing material containing graphene nano layer as well as preparation method and application thereof
  • Inorganic nonmetal composite wave-absorbing material containing graphene nano layer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Taking the composite material of 99% alumina powder and 1% graphene as an example, the expandable graphite was first placed in a thermal induction furnace, and the 2 Under the atmosphere, the temperature was raised to 1300° C. within 1 minute, and then cooled to room temperature. The obtained vermicular graphite was ground in a mortar and mixed with α-Al 2 o 3 Powder mixing, using silicon nitride balls and nylon ball milling tanks, and adding NMP as a grinding aid for wet grinding, 500 rpm planetary ball milling for 30 hours, then taking out the powder and drying it, and putting the powder into the graphite mill , using spark plasma sintering (spark plasma sintering, SPS) equipment for sintering.

[0031] The SPS process is carried out under vacuum conditions, with a sintering temperature of 1300 °C, a heating rate of 100 °C / min, and a holding time of 5 min; a two-step pressurization method is adopted, the pressure applied before sintering is 10 MPa, and the pressure ...

Embodiment 2

[0035] Graphite oxide is first prepared. In 0.15g of graphite, add 5g of potassium persulfate (K 2 S 2 o 8 ), 5g phosphorus pentoxide (P 2 o 5 ) and 30ml of concentrated sulfuric acid, stirred at 80°C for 4.5 hours, added excess deionized water, filtered through a filter membrane and washed with water until the pH value was neutral, and then dried at 60°C. Add 100ml concentrated sulfuric acid and 6g potassium permanganate (KMnO 4 ), the entire mixing process needs to be carried out in an ice bath. The mixture was then stirred at 35°C for 5 days. After that, 1 L of deionized water was added and stirred for 2 hours, and then 50 ml of 30% hydrogen peroxide aqueous solution was slowly added. Filter with a filter membrane and wash with 10% hydrochloric acid three times, and then wash with deionized water until the pH value is neutral. Finally, dialysis removes all impurity ions.

[0036] The prepared graphite oxide was directly added to the silica sol at a mass ratio of 5%...

Embodiment 3

[0038] With a composition of 95% silicon nitride (Si 3 N 4 ) and 5% graphene composite material as an example, first place the expanded graphite in a vacuumized sealed glass tube, heat it in a (60Hz microwave) microwave oven for 3 minutes, and then cool it down to room temperature. After the obtained vermicular graphite was ground in a mortar, it was mixed with Si 3 N 4 Powder mixing, using silicon nitride balls and nylon ball milling tanks, and adding NMP as a grinding aid for wet grinding, 500 rpm planetary ball milling for 30 hours, then taking out the powder and drying it, and putting the powder into the graphite mill , using hot isostatic pressing furnace equipment for sintering.

[0039] The hot isostatic pressing sintering process is carried out under vacuum conditions. The sintering temperature is 1400°C, the heating rate is 500°C / h, and the holding time is 1h; the pressure during the sintering process is 150MPa. The insertion loss value of the composite material p...

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Abstract

The invention relates to an inorganic nonmetal composite wave-absorbing material containing a graphene nano layer as well as a preparation method and application thereof. The material comprises the graphene nano layer and inorganic nonmetal, wherein the voltage of the graphene nano layer is 0.1-50 percent of that of the entire inorganic nonmetal composite wave-absorbing material. The preparation method comprises the following steps of: (1) mixing the graphene nano layer and the inorganic nonmetal; and (2) sintering mixed powder of the graphene nano layer and the inorganic nonmetal in as the way of normal pressure, hot pressing, hot isostatic pressing or discharge plasmas, and the like. The material has the characteristics of high temperature resistance, corrosion resistance and good wave absorption performance and improves the wave absorption effect while reducing surface reflection; and the preparation method is simple and suitable for industrialized production.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic composite wave-absorbing material and its preparation and application, in particular to an inorganic non-metallic composite wave-absorbing material containing graphene nanosheets, its preparation and application. Background technique [0002] With the development of modern science and technology, various electronic and electrical equipment have provided great help for people's daily life and social construction. At the same time, the electromagnetic radiation and interference problems generated during the working process of electronic and electrical equipment restrict people's production and life, leading to the deteriorating electromagnetic environment of human living space. The wide application of electromagnetic waves in science and technology has also brought social problems, becoming a new, more harmful and difficult to protect pollution source after water, air and noise. It not only aff...

Claims

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Application Information

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IPC IPC(8): C04B35/52C04B35/10C04B35/584C04B35/14C04B35/622
Inventor 王连军范宇驰江莞
Owner DONGHUA UNIV
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