Light-weight ceramic acoustic absorber and method of manufacturi

Details Light-weight ceramic acoustic absorber and method of manufacturi Light-weight ceramic acoustic absorber and method of manufacturi

1997-12-23

1999-04-20

Dang, Khanh

Acoustics

Sound-modifying means

Sound absorbing panels

181294, 4283122, 264 42, 501 84, E04B 182

Patent

active

058958975

ABSTRACT:
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.

REFERENCES:
patent: 3949029 (1976-04-01), Ulisch
patent: 4756956 (1988-07-01), Nagai et al.
patent: 5684278 (1997-11-01), Yasukawa et al.
patent: 5773121 (1998-06-01), Meteer et al.

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