How do ceramic fibers react with oxygen and water vapor at high temperatures?

Ceramic fibers, when exposed to high temperatures, can react differently with oxygen and water vapor depending on their composition. Generally, ceramic fibers are resistant to oxidation and corrosion, but at very high temperatures, they can undergo oxidation, leading to a loss of material and strength. This is particularly true for fibers with a high carbon content. Water vapor can also cause degradation, especially in the presence of oxygen, as it can form steam which can lead to the breakdown of the fiber's structure. The rate of these reactions increases with temperature, and can significantly affect the performance and longevity of ceramic fibers in high-temperature applications.