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Preparation method of high-temperature-resistant SiBN(C) carbon fiber coating

A technology of carbon fiber and high temperature resistance, which is applied in the field of preparation of modified carbon fiber, which can solve the problems of limited carbon fiber application, poor high temperature oxidation resistance of carbon fiber, and decline in mechanical properties, and achieve high temperature oxidation resistance and excellent mechanical properties. Strong, uniform and dense coating effect

Inactive Publication Date: 2013-08-14
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the high-temperature oxidation resistance of carbon fiber is poor, and the mechanical properties of carbon fiber will begin to decline at 450 ° C. This shortcoming greatly limits the application of carbon fiber in extreme environments.

Method used

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  • Preparation method of high-temperature-resistant SiBN(C) carbon fiber coating
  • Preparation method of high-temperature-resistant SiBN(C) carbon fiber coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare a polyborosilazane anhydrous toluene solution with a mass fraction of 0.01%; under a nitrogen atmosphere, put the carbon fiber in a tube furnace at a temperature of 100 ° C for 1 hour; then use a concentration of 40-70% Take it out after soaking in nitric acid for 0.1h, wash it with deionized water and dry it. Under nitrogen atmosphere, put the pretreated carbon fiber into the configured 0.01% polyborosilazane anhydrous toluene solution and immerse it for 0.1 hour, then transfer it to the tube furnace. Under nitrogen flow, the temperature was raised to 100°C at a rate of 0.02°C / min to polymerize and cross-link the carbon fiber, and the temperature was kept at 2 hours; then the temperature was raised to 1000°C at a rate of 0.05 / min for cracking, and after 2 hours of heat preservation, the carbon fiber was heated at 0.05°C / min. The temperature was lowered to 600 °C at a rate of min to obtain SiBN (C) carbon fibers. Its heat-resistant temperature under oxidizing a...

Embodiment 2

[0026] Prepare a polyborosilazane anhydrous toluene solution with a mass fraction of 10%; under a nitrogen atmosphere, put the carbon fiber in a tube furnace at a temperature of 300 ° C for 3 hours; then use a concentration of 40-70% After soaking in nitric acid for 0.5h, take it out, wash it with deionized water and dry it. Under a nitrogen atmosphere, the pretreated carbon fibers were immersed in a prepared 10% polyborosilazane anhydrous toluene solution for 0.5 hours, and then transferred to a tube furnace. Under nitrogen flow, the temperature was raised to 200°C at a rate of 0.2°C / min to polymerize and crosslink the carbon fiber, and the temperature was kept for 4 hours, and then the temperature was raised to 1300°C at a rate of 0.5 / min for cracking. The temperature was lowered to 400°C at a rate of min to obtain SiBN (C) carbon fibers. Its heat-resistant temperature in an oxidative atmosphere is 700°C, and the coating is uniform and dense without micro-cracks.

Embodiment 3

[0028] Prepare a polyborosilazane anhydrous toluene solution with a mass fraction of 20%. Under a nitrogen atmosphere, put the carbon fiber in a tube furnace at 600°C for 6 hours of degumming treatment; then soak it in 40-70% nitric acid for 5 hours, take it out, wash it with deionized water and dry it. Under a nitrogen atmosphere, the pretreated carbon fibers were immersed in a prepared 20% polyborosilazane anhydrous toluene solution for 5 hours, and then transferred to a tube furnace. Under nitrogen flow, the temperature was raised to 400°C at a rate of 2°C / min to polymerize and cross-link the carbon fibers, and the temperature was kept at 6 hours; then the temperature was raised to 1000°C at a rate of 5 / min for cracking, and after 6 hours of heat preservation, the temperature was increased to 5°C / min. The temperature was lowered to 200°C at a rate of min to obtain SiBN (C) carbon fibers. Its heat-resistant temperature under oxidizing atmosphere is 800°C, and the coating is...

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Abstract

The invention relates to a preparation method of high-temperature-resistant SiBN(C) carbon fiber coating. The preparation method comprises the following steps of: (1) preparing polyborosilazane anhydrous toluene solution; (2) performing glue-removing treatment on the carbon fiber at 100 to 600 DEG C and soaking the carbon fiber into 40 to 70 percent nitric acid to obtain the treated carbon fiber; (3) under the protection of nitrogen, soaking the treated carbon fiber into the polyborosilazane anhydrous toluene solution for 0.1 to 5 hours and standing; and (4) under the atmosphere of nitrogen flow, crosslinking the soaked carbon fiber obtained in the step (3), heating to 1,000 to 1,600 DEG C at the rate of 0.05 to 5 DEG C / min, cracking and cooling to obtain the high-temperature-resistant SiBN(C) carbon fiber coating. The preparation method is simple and has strong actionability; and the surface of the obtained SiBN(C) carbon fiber coating is uniform and compact, the original mechanical property of the carbon fiber is maintained, and the high-temperature oxidation resistance is improved.

Description

technical field [0001] The invention belongs to the field of preparation of modified carbon fibers, and in particular relates to a preparation method of a high-temperature-resistant SiBN (C) carbon fiber coating. Background technique [0002] Since its appearance as a commodity in the 1960s, carbon fiber (hereinafter referred to as CF) is resistant to acids and alkalis due to its high specific strength, specific modulus, excellent thermal conductivity, electrical conductivity, and good thermal stability in an inert atmosphere. The strong stability of erosion has aroused people's widespread concern and it has been rapidly applied to high-tech fields such as aviation and aerospace, as well as many fields of civil industry. [0003] However, the high-temperature oxidation resistance of carbon fiber is poor, and the mechanical properties of carbon fiber will begin to decline at 450°C. This shortcoming greatly limits the application of carbon fiber in extreme environments. In or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/80D06M101/40
Inventor 余木火柯盛包邱显星韩克清贾军唐彬彬胡建建牟世伟孙泽玉王会峰耿冉杨燕萍姜正飞李堃庄恒飞陈磊
Owner DONGHUA UNIV
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