Preparation method of alumina-zirconia composite coating on surface of high-thermal-conductivity carbon fiber

A composite coating and carbon fiber technology, which is applied in the fields of carbon fiber, fiber treatment, textiles and papermaking, etc., can solve problems such as cracks and peeling off of the coating, failure to meet energy saving requirements, and affect the application of carbon fiber, etc., to achieve low toxicity and low toxicity , easily accessible effects

Active Publication Date: 2020-08-11
苏州优越新材料有限公司
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  • Application Information

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Problems solved by technology

The main problem is that the heat treatment temperature is high, which does not meet the energy-saving requirements; in addition, when coating carbon fibers with binary or more multi-element sols, there is not only the problem of high-temperature heat treatment, but also the prepared coating is prone to cracks and peeling off. Influencing the application of carbon fiber in aluminum matrix composites
[0007] The main disadvantages of the method for preparing alumina-zirconia composite coatings in the above-mentioned patents and documents are: (1) the preparation of alumina-zirconia composite coatings by chemical deposition method is harsh, the energy consumption is large, and it is not suitable for carbon fiber materials. (2) The alumina-zirconia composite coating is prepared by the sol-gel method, and the raw materials are relatively expensive and toxic. (3) It takes a long time to hydrolyze and age to obtain the alumina sol, which is inefficient and wastes energy.
[0008] In addition, the above-mentioned patents and documents only involve the method of preparing alumina-zirconia composite coatings, which have not been applied to carbon fiber
Because the alumina-zirconia composite coating is a binary sol coating, it is easy to crack during heat treatment after coating carbon fiber

Method used

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  • Preparation method of alumina-zirconia composite coating on surface of high-thermal-conductivity carbon fiber
  • Preparation method of alumina-zirconia composite coating on surface of high-thermal-conductivity carbon fiber
  • Preparation method of alumina-zirconia composite coating on surface of high-thermal-conductivity carbon fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Place the carbon fiber in a tube furnace, keep it warm at 400°C for 20min, soak it in acetone for 1h after cooling to completely remove the glue, then wash it with deionized water, and dry it in vacuum at 80°C for 3h.

[0044] Mix zirconium nitrate and yttrium nitrate at a molar ratio of 97:3, add deionized water to form a 1 mol / L zirconium nitrate solution, add dropwise a 1mol / L oxalic acid solution, and add dropwise at a molar ratio of zirconium nitrate and oxalic acid of 4.5:1, Add 423ml of deionized water and keep stirring for 30min, add 13g of polyvinyl alcohol and 13g of glycerol, and then put it in a water bath at 95°C and keep stirring for 40min to obtain a blue transparent zirconium-containing sol with a concentration of 0.3mol / L ;Mix 3mol / L ammonia solution and 1mol / L aluminum nitrate solution at a molar ratio of 4:1, and continue to stir for 30 minutes to obtain a solution with milky white precipitate, filter, wash with deionized water several times, and dry a...

Embodiment 2

[0048] The treated carbon fibers were submerged in the sol, ultrasonically impregnated for 5 minutes, the carbon fibers were repeatedly coated and dried twice, and the rest of the process steps and conditions were the same as in Example 1.

[0049] Carbon fibers coated with an alumina-zirconia composite coating are obtained through the above steps, and the thickness of the coating is about 65 nm.

Embodiment 3

[0051] The treated carbon fibers were submerged in the sol, ultrasonically impregnated for 5 minutes, the carbon fibers were repeatedly coated and dried three times, and the rest of the process steps and conditions were the same as in Example 1.

[0052] Carbon fibers coated with an alumina-zirconia composite coating are obtained through the above steps, and the thickness of the coating is about 100 nm.

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Abstract

The invention discloses a preparation method of an alumina-zirconia composite coating on the surface of a high-thermal-conductivity carbon fiber. The preparation method is a sol-gel method, and comprises the processes of pretreatment of the surface of the carbon fiber; preparation of composite sol; coating and drying treatments of the pretreated carbon fiber after the pretreatment; and low temperature heat treatment of the carbon fiber coated with the composite sol. The carbon fiber coated with the alumina-zirconia composite coating was obtained through the processes. The crystal form of the composite coating prepared by the preparation method is the composite coating of gamma-Al2O3.t-ZrO2. According to the preparation method, the process is simple, the requirements on equipment and operating environment are low, the implementability is strong, raw materials are low in price and easy to obtain, the method is easy to realize and energy-saving and environmentally friendly, the compositecoating with complete coating and adjustable thickness can be prepared on the surface of the high-thermal-conductivity carbon fiber, and the oxidation resistance of the carbon fiber and the thermal conductivity of a carbon fiber reinforced aluminum-based composite material are improved.

Description

technical field [0001] The invention relates to the field of high thermal conductivity carbon fiber reinforced aluminum matrix composite materials, in particular to a method for preparing an alumina-zirconia composite coating on the surface of high thermal conductivity carbon fiber. Background technique [0002] High thermal conductivity carbon fiber not only has the advantages of high strength and high modulus, low thermal expansion coefficient, low density and corrosion resistance of polypropylene cyanocarbon fiber, but also has the unique advantages of unidirectional high thermal conductivity, so it is often used as a reinforcement to improve the thermal properties of composite materials and Mechanical properties, its composite materials are widely used in aviation, aerospace, machinery, electronics and other fields. However, the oxidation resistance of carbon fiber is poor, and it begins to oxidize at about 400°C in the air, and the wettability of carbon fiber and alumin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/45D06M11/46C22C49/06C22C49/14C22C101/10D06M101/40
CPCD06M11/45D06M11/46C22C49/06C22C49/14D06M2101/40
Inventor 欧阳求保朱城楠曹贺
Owner 苏州优越新材料有限公司
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