The carbon carbon composite material has a big difference to the superalloy and ceramic materials. Under inert conditions,even the temperature reach 20000C,the strength of the C/C material can still remain unchanged situation,the strength will not reduce.
The carbon carbon composite material have a good resistance to thermal shocks and excellent mechanical properties. However, the fatal weakness of CFC material is the low oxidation resistance.although the C/C material has a high specific strength, high specific stiffness and high temperature stability,as one attractive structure material,when the temperature reach 4000C,the carbon carbon composite material start to oxidize. So the most researches on the C/C composite is how to avoid or reduce the degree of oxidation,and also many researches on the processing of the material,structure and the activity, quantitative relationship and the comparison between the C/C with protective layer and without protective layer. One of the most important results is that the physical properties have a big influence to the carbon carbon composite material activity.
The flow chart of C/C material below：
The different processing between carbon cloth and carbon felt can lead to the different C/C composite material,although they have the similar structure and graphitization degree and same heating treatment,they still have the different properties,the main reason is the oxidation direction,as the two different carbon fiber,they have the different surface area and pore volume.
So before using the carbon cloth or carbon felt to make C/C composite material,it’s also important to research the different fiber physical property.
