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Polyimide resin-based structure wave-absorbing material reinforced by nickel cobaltate-silicon carbide fiber multi-scale reinforcement and preparation method thereof

A polyimide resin and silicon carbide fiber technology, which is applied in the field of wave-absorbing materials, can solve problems such as poor wave-absorbing performance and reduced mechanical properties, and achieve improved electrical conductivity, good high-temperature stability, and increased interface polarization capabilities Effect

Active Publication Date: 2017-09-19
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current SiC fiber-reinforced polyimide resin-based structural absorbing materials have poor microwave-absorbing performance, although the SiC fiber-reinforced polyimide can be effectively The wave-absorbing performance of imide composite materials, but inevitably brings about the problem of reduced mechanical properties

Method used

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  • Polyimide resin-based structure wave-absorbing material reinforced by nickel cobaltate-silicon carbide fiber multi-scale reinforcement and preparation method thereof
  • Polyimide resin-based structure wave-absorbing material reinforced by nickel cobaltate-silicon carbide fiber multi-scale reinforcement and preparation method thereof

Examples

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Effect test

preparation example Construction

[0034] The preparation method of the nickel cobaltate-silicon carbide fiber multi-scale reinforcement reinforced polyimide resin-based structural wave-absorbing material of the present invention, its specific steps:

[0035] Step 1, evenly brush the polyamic acid solution (the solid content of the polyimide is 40%) of the precursor of polyimide on the upper surface of the prepared multi-piece nickel cobaltate-silicon carbide fiber multi-scale reinforcement and the lower surface. The nickel cobaltate-silicon carbide fiber multi-scale reinforcement coated with polyamic acid is stacked neatly, generally 5 to 10 pieces, to obtain a prefabricated piece of polyimide resin-based structural wave-absorbing material. Put the prefabricated part of the polyimide resin-based structural wave-absorbing material into a vacuum oven, vacuumize the vacuum oven-hold pressure-release pressure to impregnate the nickel cobaltate-silicon carbide fiber multi-scale reinforcement, specifically Yes, eva...

Embodiment 1

[0038] This embodiment is a nickel cobaltate-silicon carbide fiber multi-scale reinforcement reinforced polyimide resin-based structural wave-absorbing material, the polyimide resin-based structural wave-absorbing material The multi-scale reinforcement is the absorbent, and the polyimide resin is used as the matrix. The nickel cobaltate-silicon carbide fiber multi-scale reinforcement has a content of 40wt%, and the polyimide resin has a content of 60wt%.

[0039] This example also proposes a method for preparing the nickel cobaltate-silicon carbide fiber multi-scale reinforcement reinforced polyimide resin-based structure absorbing material, the specific process is:

[0040] Step 1. Put 6 pieces of silicon carbide fiber cloth cut to a suitable size, put them in acetone, wash them in an ultrasonic wave for 1 hour, and then dry them in an oven; the drying temperature is 80°C; the ultrasonic power is 100W. The size of silicon carbide fiber cloth is 35mm*45mm.

[0041] Step 2, s...

Embodiment 2

[0047] This embodiment is a nickel cobaltate-silicon carbide fiber multi-scale reinforcement reinforced polyimide resin-based structural wave-absorbing material, the polyimide resin-based structural wave-absorbing material The multi-scale reinforcement is the absorbent, and the polyimide resin is used as the matrix. The nickel cobaltate-silicon carbide fiber multi-scale reinforcement has a content of 40wt%, and the polyimide resin has a content of 60wt%.

[0048] This example also proposes a method for preparing the nickel cobaltate-silicon carbide fiber multi-scale reinforcement reinforced polyimide resin-based structure absorbing material, the specific process is:

[0049] Step 1. Put 7 pieces of silicon carbide fiber cloth cut to a suitable size, put them in acetone, wash them in an ultrasonic wave for 1 hour, and then dry them in an oven; the drying temperature is 80°C; the ultrasonic power is 100W. The size of silicon carbide fiber cloth is 35mm*45mm.

[0050] Step 2, s...

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Abstract

The invention relates to a polyimide resin-based structure wave-absorbing material reinforced by nickel cobaltate-silicon carbide fiber multi-scale reinforcement and a preparation method thereof; the preparation method comprises: adding degummed dried silicon carbide fiber cloth in solution A to carry out hydrothermal reaction, taking out the silicon carbide fiber cloth after reacting, and annealing to obtain nickel cobaltate-silicon carbide fiber multi-scale reinforcement, wherein the solution A is made by adding cobalt nitrate, nickel nitrate and urea in water and stirring well; brushing polyamide acid solution evenly to the outer surface of the nickel cobaltate-silicon carbide fiber multi-scale reinforcement, and stacking neatly to obtain a preform; subjecting the preform to a multiple repeat process of vacuumizing, pressure holding, and relief, and performing mold pressing to obtain the polyimide resin-based structure wave-absorbing material reinforced by nickel cobaltate-silicon carbide fiber multi-scale reinforcement. Nickel cobaltate is grown on the surface of silicon carbide fiber, interfacial polarizing capacity and electrical conductivity of the composite are improved, and good wave-absorbing performance and mechanical properties are achieved.

Description

technical field [0001] The invention relates to the technical field of wave-absorbing materials, in particular to a nickel-cobaltate-silicon carbide fiber multi-scale reinforcement reinforced polyimide resin-based structure wave-absorbing material and a preparation method thereof. Background technique [0002] With the emergence of various advanced radar detectors and precision-guided weapons, the threats faced by new weapons and equipment have also increased. How to reduce the detectability of weapon targets and improve the survivability of weapons on the battlefield has been highly valued by various countries. In modern warfare, radar is the most reliable means of detecting targets, so radar stealth is the focus of stealth technology. At present, radar stealth is mainly achieved by reducing the radar cross-section RCS (Radar Cross-Section) of military targets through two technical approaches: radar absorbing materials and shape stealth design. Resin-based structural abso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/02C08K7/10C08K3/24C08L79/08C09K3/00
CPCC08K3/24C08K7/10C08K9/02C09K3/00C08L79/08
Inventor 望红玉党明月刘盈程芝龙
Owner SHAANXI UNIV OF SCI & TECH
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