Silicon nitride@carbon wave-absorbing foam, and preparation method and application thereof
A silicon nitride and foam technology, applied in the field of preparation of wave absorbing materials, can solve the problems of poor impedance matching, discontinuous microstructure, low density electrical conductivity, etc., and achieve low cost of raw materials, excellent wave absorption performance, and preparation process. simple effect
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Embodiment 1
[0044] A preparation method of silicon nitride@carbon wave-absorbing foam, comprising the following steps:
[0045]1) Dissolve 1.8g of glucose in 100mL of deionized water and stir for 30min with a magnetic stirrer to obtain a 0.1mol / L glucose aqueous solution;
[0046] 2) Add 60mL of glucose aqueous solution into a polytetrafluoroethylene hydrothermal kettle, and then add a solution with a density of 20mg / cm 3 Silicon nitride nanoribbon airgel;
[0047] 3) Put the hydrothermal kettle into an electric blast drying oven, react at 180°C for 8 hours, wash and dry the obtained product to obtain a silicon nitride@organic carbon composite;
[0048] 4) The silicon nitride@organic carbon composite is calcined in an inert atmosphere furnace, and kept at 700°C for 1 hour, and finally silicon nitride@carbon absorbing foam is obtained;
[0049] figure 2 It is the SEM photo of the silicon nitride@carbon wave-absorbing foam prepared in this example. It can be seen that the foam has a con...
Embodiment 2
[0052] 1) Weigh 41.5g of sucrose and dissolve it in 100mL of deionized water, and stir for 30min with a magnetic stirrer to obtain a 1mol / L sucrose aqueous solution;
[0053] 2) Add 60mL of sucrose aqueous solution to the polytetrafluoroethylene hydrothermal kettle, and then add the density of 20mg / cm 3 Silicon nitride nanoribbon airgel;
[0054] 3) Put the hydrothermal kettle into an electric blast drying oven, react at 180°C for 8 hours, wash and dry the obtained product to obtain a silicon nitride@organic carbon composite;
[0055] 4) The silicon nitride@organic carbon composite was calcined in an inert atmosphere furnace and kept at 700°C for 1 hour to finally obtain silicon nitride@carbon wave-absorbing foam.
Embodiment 3
[0057] 1) Dissolve 9g of glucose in 100mL of deionized water and stir for 30min with a magnetic stirrer to obtain a 0.5mol / L glucose aqueous solution;
[0058] 2) Add 60mL of glucose aqueous solution into a polytetrafluoroethylene hydrothermal kettle, and then add a solution with a density of 20mg / cm 3 Silicon nitride nanoribbon airgel;
[0059] 3) Put the hydrothermal kettle into an electric blast drying oven, react at 180°C for 8 hours, wash and dry the obtained product to obtain a silicon nitride@organic carbon composite;
[0060] 4) The silicon nitride@organic carbon composite was calcined in an inert atmosphere furnace and kept at 700°C for 1 hour to finally obtain silicon nitride@carbon wave-absorbing foam.
[0061] Figure 4 It is the TEM image of the silicon nitride@carbon absorbing foam prepared in this example. From Figure 5 It can be seen that the amorphous carbon layer with a thickness of about 70 nm is uniformly coated on the surface of the silicon nitride na...
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