Carbon fiber composite materials are widely used in aerospace, automobile manufacturing, rail transportation and other fields due to their excellent mechanical properties and chemical resistance. However, its strength change at high temperatures is one of the important factors that determine its application range. This article will explore the strength changes of carbon fiber composites at high temperatures.
The high temperature resistance of carbon fiber itself
Carbon fiber itself has excellent high temperature resistance. According to theory, carbon fiber can withstand high temperatures up to 2600°C. However, carbon fiber is usually not used alone, but is composited with materials such as resin to create finished products. The strength changes of this composite at high temperatures can be affected by the type of resin used.
Strength changes of carbon fiber composites at high temperatures
Epoxy resin composite
Epoxy resin is one of the most commonly used resins in carbon fiber composites. However, epoxy resin has relatively poor high temperature resistance and usually oxidizes and decomposes at 180~200°C. Therefore, the strength of epoxy-based carbon fiber composites will significantly decrease at high temperatures.
thermoplastic resin composite
Compared to epoxy resins, thermoplastic resins (such as polyphenylene sulfide and polyether ether ketone) have better high temperature resistance. Carbon fiber composites made using these resins show less strength loss at high temperatures.
ceramic matrix composite
Among all types of carbon fiber composites, ceramic matrix composites have the strongest resistance to high temperatures. This type of material can remain stable at temperatures up to 1500°C, and its strength barely changes at high temperatures.
in conclusion
The strength of carbon fiber composites at high temperatures changes primarily depending on the type of resin used. The strength of epoxy resin-based composites decreases significantly at high temperatures, while thermoplastic resin and ceramic-based composites have better high-temperature resistance. Understanding these properties is critical to selecting the appropriate carbon fiber composite for a specific application.
