Protective measures for high temperature applications of carbon fiber
As a high-performance material, carbon fiber has been widely used in aerospace, automobile manufacturing, sporting goods and other fields due to its excellent physical and chemical properties. However, the performance changes of carbon fiber at high temperatures have imposed certain limitations on its application. In order to overcome these limitations, researchers and engineers have developed a series of protective measures to ensure the stability and reliability of carbon fiber in high temperature environments.
Matrix modification and passivation of surface active sites
At lower temperatures, carbon/carbon composites can be protected by matrix modification and passivation of surface active sites. These methods can reduce the direct contact between carbon fiber and oxygen, thereby reducing the occurrence of oxidation reactions. Matrix modification usually involves chemical treatment of the carbon fiber surface to form a protective film that isolates oxygen and slows down the rate of oxidation reactions.
Coating protection
With the increase of temperature, coating protection becomes an effective oxidation protection solution. The coating can isolate the carbon/carbon composite from direct contact with oxygen, thereby achieving the purpose of oxidation protection. Commonly used coating materials include ceramics, metals and organic coatings. These coatings can not only provide a physical barrier, but also improve the high temperature resistance of carbon fiber to a certain extent.
Improved manufacturing process and quality control
By improving the manufacturing process and quality control of carbon fiber, its stability in high temperature environment can be improved. For example, using higher carbonization temperature and longer carbonization time can improve the crystallinity and thermal stability of carbon fiber. In addition, through strict quality control, impurities and defects in carbon fiber can be reduced, thereby improving its high temperature resistance.
Surface treatment technology
In addition to coating protection, other surface treatment technologies can also be used to enhance the high temperature resistance of carbon fiber. For example, a protective layer can be formed on the surface of carbon fiber by plasma treatment, chemical vapor deposition and other methods. These protective layers can not only isolate oxygen, but also improve the antioxidant properties of carbon fiber.
Conclusion
In summary, in order to ensure the stability and reliability of carbon fiber in high temperature environment, a variety of protective measures can be taken. These measures include matrix modification, passivation of surface active points, coating protection, improved manufacturing process and quality control, and surface treatment technology. Through these measures, the impact of high temperature on the performance of carbon fiber can be effectively reduced, thereby broadening its application range in high temperature environment.
