High-strength carbon fiber composite material with self-sensing function and preparation method

A technology of high-strength carbon fiber and composite materials, which is applied in the direction of carbon fiber, fiber processing, and the measurement of the properties and forces of piezoelectric devices. Achieve excellent consistency and uniform thickness

Active Publication Date: 2022-04-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the smart materials with self-detection function mainly include strain gauge arrays, fiber optic sensors, and piezoelectric composite materials, etc. The composite material is a piezoelectric polymer layer laid between the composite material layers, so it has a high degree of bendable deformation capability, but because the introduced piezoelectric polymer layer is a heterogeneous material different from the original composite material, it inevitably causes The overall mechanical strength and physical properties of the material are greatly reduced

Method used

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  • High-strength carbon fiber composite material with self-sensing function and preparation method
  • High-strength carbon fiber composite material with self-sensing function and preparation method
  • High-strength carbon fiber composite material with self-sensing function and preparation method

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Experimental program
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Effect test

Embodiment 1

[0037] 1) Preparation of titanium oxide seed layer on carbon fiber braided layer

[0038] First, the carbon fiber braided layer was cleaned by ultrasonic vibration with acetone, ethanol, and deionized water, and then a titanium oxide seed layer with a thickness of 50 nm was deposited on the surface using atomic layer deposition (ALD). The process is as follows: nitrogen is used as the carrier gas, and the titanium source precursor is blown in the form of steam for 0.1 second, and then the excess titanium source is blown out through nitrogen for 6 seconds, and the titanium source is chemically adsorbed on the carbon fiber braided layer; then ozone is introduced , it takes 0.5 seconds, and then nitrogen gas is blown out to blow out the excess ozone. It takes 6 seconds. The ozone reacts with the titanium source precursor adsorbed on the carbon fiber cloth to form a monoatomic layer of titanium oxide; then the reaction residue is blown out by nitrogen gas, and it takes 6 seconds. ...

Embodiment 2

[0050] Arrange four carbon fiber braided layers modified with polarized piezoelectric nano-layers with a size of 1cm×1cm as an array of intermediate functional layers. Curing at a temperature of 100°C for about 2 hours, a sandwich-structured piezoelectric nano-layer modified carbon fiber composite structure, such as image 3 As shown, connect the electrodes of the 4 intermediate functional layers to the 4 channels of the oscilloscope, use the same force to press the positions of the 4 intermediate functional layers in turn, and collect the output signals of the 4 oscilloscope channels on the computer at the same time.

[0051] Test results such as Figure 4 As shown, when pressing position 1 of the first intermediate functional layer, see Figure 4 (a), the voltage signal collected by channel 1 is the largest, the voltage signals collected by channels 2 and 3 corresponding to positions 2 and 3 adjacent to position 1 are obviously smaller, and the position 4 which is farthest ...

Embodiment 3

[0053] 1) Preparation of titanium oxide seed layer on carbon fiber braided layer

[0054] First, the carbon fiber braided layer was cleaned by ultrasonic vibration with acetone, ethanol, and deionized water, and then a titanium oxide seed layer with a thickness of 50 nm was deposited on the surface using atomic layer deposition (ALD). The process is as follows: nitrogen is used as the carrier gas, and the titanium source precursor is blown in the form of steam for 0.1 second, and then the excess titanium source is blown out through nitrogen for 6 seconds, and the titanium source is chemically adsorbed on the carbon fiber braided layer; then ozone is introduced , it takes 0.5 seconds, and then nitrogen gas is blown out to blow out the excess ozone. It takes 6 seconds. The ozone reacts with the titanium source precursor adsorbed on the carbon fiber cloth to form a monoatomic layer of titanium oxide; then the reaction residue is blown out by nitrogen gas, and it takes 6 seconds. ...

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Abstract

The invention discloses a high-strength carbon fiber composite material with a self-sensing function and a preparation method, and belongs to the field of carbon fiber composite materials. According to the preparation method of the high-strength carbon fiber composite material with the self-sensing function, the piezoelectric nano layer is loaded on the carbon fiber braid layer, and the piezoelectric nano layer is a barium titanate nano material. According to preparation of the piezoelectric nano layer, a seed crystal layer grows on the surface of the carbon fiber braid layer through the atomic layer deposition technology, the seed crystal layer has the function of enabling the piezoelectric nano layer to be evenly and compactly attached to the carbon fiber braid layer, then the seed crystal layer is thickened through a hydrothermal method, the thickened seed crystal layer is converted into the piezoelectric nano layer, and the piezoelectric nano layer is formed. A composite material of a sandwich structure is constructed based on the carbon fiber braid layer loaded with the piezoelectric nano layer as a middle functional layer; the atomic layer deposition technology is that the surface of the carbon fiber braid layer is plated layer by layer in the form of a monatomic film, so that the deposited seed crystal layer has extremely uniform thickness and excellent consistency, the morphology and array distribution of the subsequent piezoelectric nano layer can be accurately controlled through mask selective deposition, and the performance of the piezoelectric nano layer is improved. The method also becomes an important basis for finally detecting sensitive and considerable piezoelectric signals.

Description

technical field [0001] The invention belongs to the field of carbon fiber composite materials, in particular to a high-strength carbon fiber composite material with self-sensing function and a preparation method. Background technique [0002] Carbon fiber has the advantages of high specific strength and specific modulus, low density, strong designability, and easy molding. It is the most important reinforcing material in advanced composite materials and has been widely used in military and civilian fields. When carbon fiber composite materials are used in large structural parts such as aviation wings, fatigue and extreme environmental changes will cause damage to the material in a complex environment. It brings serious safety hazards to the entire equipment system, and traditional detection schemes such as infrared detection and acoustic emission detection require large and complex external detection equipment, which cannot detect material damage in real time and online. The...

Claims

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Application Information

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IPC IPC(8): G01L1/16G01B7/16B32B9/00B32B33/00D06M11/46D06M15/55D06M101/40
CPCG01L1/16G01B7/16B32B5/02B32B33/00D06M11/46D06M15/55B32B2262/106B32B2255/02B32B2255/26B32B2307/306B32B2307/714D06M2101/40
Inventor张洁谢俊张易军任巍陈小明
OwnerXI AN JIAOTONG UNIV