Light-weight ceramic acoustic absorber and method of manufacturing the same

摘要

There is provided a light-weight ceramic acoustic absorber including an alumina based ceramic containing SiC whiskers, as a perforated body with a void ratio in the range of 80 to 92%, where there are voids with a mean diameter in the range of 50 to 450 mu m near the front surface of the body, and the void diameters are larger towards the rear surface of the body, and a mean diameter of the voids is in the range of 500 to 3,400 mu m near the rear surface of the body, and there is an increasing trend in void diameters from the front to the rear surfaces. The light-weight ceramic acoustic absorber provides various advantages such as light weight, high resistance to thermal stresses, high acoustic absorptivity, and high resistance to the gas jet from a jet engine.