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Bimetallic oxide-silicon carbide fiber multi-scale reinforcement reinforced aluminum phosphate ceramic-based structure wave absorbing material and preparation method thereof

A bimetallic oxide and silicon carbide fiber technology, applied in the field of wave-absorbing materials, can solve the problems of uneven dispersion of nano-powders, controllability and uniformity of dielectric properties of structural wave-absorbing materials, etc. Electrical properties, good absorbing effect and mechanical properties, the effect of good absorbing effect

Active Publication Date: 2017-10-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the aluminum phosphate matrix is ​​a high-temperature wave-transmitting material, in order to achieve a good wave-absorbing effect, it is necessary to add a certain amount of nano-absorbents, such as carbon black, carbon nanotubes, silicon carbide, etc., in the process of preparing composite materials. The powder is easy to agglomerate and cause uneven dispersion in the matrix, which leads to poor controllability and uniformity of the dielectric properties of the structural absorbing material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment is a nickel cobaltate-silicon carbide fiber multi-scale reinforcement reinforced aluminum phosphate ceramic-based structural wave-absorbing material, the aluminum phosphate ceramic-based structural wave-absorbing material is made of nickel cobaltate-silicon carbide fiber multi-scale reinforcement As the absorbent, aluminum phosphate is used as the matrix. The content of nickel cobaltate-silicon carbide fiber multi-scale reinforcement is 40wt%, and the aluminum phosphate matrix is ​​40wt%.

[0039] 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.

[0040] Step 2. Preparation of nickel cobaltate-silicon carbide fiber multi-scale reinforcement. Weigh a certain amount of cobalt nitrate, nickel nitrate and urea, wherein the...

Embodiment 2

[0045] This embodiment is a nickel cobaltate-silicon carbide fiber multi-scale reinforcement reinforced aluminum phosphate ceramic-based structural wave-absorbing material, the aluminum phosphate ceramic-based structural wave-absorbing material is made of nickel cobaltate-silicon carbide fiber multi-scale reinforcement As the absorbent, aluminum phosphate is used as the matrix. The content of nickel cobaltate-silicon carbide fiber multi-scale reinforcement is 60wt%, and the aluminum phosphate matrix is ​​40wt%.

[0046] 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.

[0047] Step 2. Preparation of nickel cobaltate-silicon carbide fiber multi-scale reinforcement. Weigh a certain amount of cobalt nitrate, nickel nitrate and urea, wherein the...

Embodiment 3

[0052] In step 2, the ratio of cobalt nitrate, nickel nitrate, urea and distilled water is 2mmol: 1mmol: 8mmol: 70ml, the hydrothermal reaction temperature is 150°C, and the hydrothermal reaction time is 5h; the annealing treatment temperature is 325°C, and the treatment time is 4h. Condition is the same as embodiment 2.

[0053] The prepared nickel cobaltate-silicon carbide fiber multi-scale reinforcement reinforced aluminum phosphate ceramic matrix absorbing material has a reflection loss of less than -7dB in the X-band frequency range and a bending strength of 273MPa.

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Abstract

The invention relates to a bimetallic oxide silicon carbide fiber multi-scale reinforcement reinforced aluminum phosphate ceramic-based structure wave absorbing material and a preparation method thereof. The method comprises the following steps: degumming a silicon carbide fiber cloth, and drying the degummed silicon carbide fiber cloth; growing a nickel cobaltate, zinc cobaltate or manganese cobaltate precursor on the surface of the dried silicon carbide fiber cloth through a hydrothermal technology, and annealing the obtained silicon carbide fiber cloth to form bimetallic oxide-silicon carbide fiber multi-scale reinforcements; uniformly coating the external surfaces of the bimetallic oxide-silicon carbide fiber multi-scale reinforcements with an aluminum phosphate slurry, laminating the coated reinforcements, and carrying out vacuum impregnation to obtain a fiber prepreg; and molding the fiber prepreg to obtain the bimetallic oxide silicon carbide fiber multi-scale reinforcement reinforced aluminum phosphate ceramic-based structure wave absorbing material. Bimetallic oxide grows on the surface of the SiC fiber to effectively regulate the dielectric constant of SiCf / AlPO4 structure wave absorbing material, and makes the structure wave absorbing material have good wave absorbing effect and good mechanical properties.

Description

technical field [0001] The invention relates to the field of wave-absorbing materials, in particular to a double-metal oxide-silicon carbide fiber multi-scale reinforcement reinforced aluminum phosphate ceramic-based structure wave-absorbing material and a preparation method thereof. Background technique [0002] The high temperature resistant structural radar absorbing material has become one of the important factors restricting the development of weapons and equipment. Among the high-temperature structural absorbing materials, continuous fiber reinforced ceramic matrix composites (CFRCMCs) have the most advantages. It has the advantages of high specific strength, high specific modulus, high toughness, etc. Through the design of the dielectric properties of the matrix and reinforcement, it can prepare high-temperature wave-absorbing materials with excellent performance. Continuous fiber-reinforced ceramic-based structural absorbing materials are currently mainly concentrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/34C04B20/10
CPCC04B20/1066C04B28/342C04B2111/00258C04B22/165C04B14/303C04B14/4693
Inventor 望红玉刘虎林王秀峰
Owner SHAANXI UNIV OF SCI & TECH
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