How is the flame retardant performance of carbon fiber composite materials?

Anyone who knows carbon fiber materials,will knows that this material is produced in a high temperature environment above 800 degrees Celsius. In an oxygen-free environment, carbon fiber can withstand very high temperatures, but in practical applications, because most of them need to be combined with resin Composite, so the temperature that the carbon fiber composite material can withstand will be greatly reduced, and the product is easily damaged by high temperature. Solving the low ignition point of carbon fiber composites and improving the flame retardancy are of great significance for expanding the scope of application and safety.

In terms of industrial indicators, flame retardancy does not mean that it will not burn or burn, but it means that the material performance can be maintained for a period of time in a certain high temperature open flame, and no toxic substances will be produced during the period. Carbon fiber composite materials are often used as alternative upgrade options for metal materials, and the original use environment of such materials is relatively harsh. Although carbon fiber is much better than metal in terms of strength, modulus and thermal expansion coefficient, carbon fiber composite materials have high temperature resistance. It's worse than metal. At present, the commonly used composite resin can withstand a temperature of about 150 degrees Celsius, and the extreme temperature resistance of carbon fiber composite materials is currently only four or five hundred degrees, which is difficult to use in some high-temperature environments.

At present, in the use of carbon fiber composite materials, whether it is aerospace or automotive industries, there will be flame retardant performance requirements for the materials. For example, rail transit cars using carbon fiber composite materials, in order to ensure the safety of passengers in the event of fire, the flame retardant performance value is required. Has a very high standard of use. Only in the case of high flame retardant performance can it be ensured that the tool will not produce harmful gases in the event of fire or friction, and maintain a certain degree of safety. Carbon fiber composite materials that can withstand high temperatures and have stable and safe performance are urgently needed materials in the industry.

Because the high temperature resistance of carbon fiber itself meets the application requirements, it is necessary to start with the base material to improve the flame retardancy of carbon fiber composites. The commonly used method is to add flame retardant to the epoxy resin to increase the ignition point. There are many kinds of flame retardants that need to be comprehensively selected according to the environment of use; the other way is to replace the matrix material and replace the epoxy with bismaleamide Resin, but the performance of processed products will be reduced. At present, the high temperature resistance of carbon fiber composite materials can be maintained at a maximum of about four hundred degrees.

In terms of improving the flame retardancy of carbon fiber composite materials, domestic scientific researchers are constantly researching and developing key problems. If carbon fiber composite materials can reach or surpass metal in the future, it will bring breakthrough progress in the application of this material.