Patent Number: 6,251,815

Title: Thermal gradient resistant ceramic composite

Abstract: A thermal gradient resistant fiber-reinforced composite structure which has a hot operating side and an opposite cool operating side and a thickness .tau. therebetween. In one embodiment, the composite has two regions: hot and cool. The hot region consists essentially of a fiber having a first coefficient of thermal expansion and a matrix material and the cool region consists essentially of a fiber having a second coefficient of thermal expansion and a matrix material. In this embodiment, the hot region has a thickness .tau..sub.H of about 10 to 90 percent of the total thickness .tau. between the hot side and the cool side, and the cool region has a thickness .tau..sub.C of about 90 to 10 percent of the total thickness .tau.. In a second embodiment, the composite has a hot operating side and an opposite cool operating side and a thickness .tau.' therebetween. In this embodiment, the composite has three regions: hot, intermediate and cool. The hot region consists essentially of a fiber having a first coefficient of thermal expansion and a matrix material and has a thickness .tau..sub.H ' of about 10 to 45 percent of the total thickness .tau.' between the hot side and the cool side, the cool region consists essentially of a fiber having a second coefficient of thermal expansion and a matrix material and has a thickness .tau..sub.C ' of about 45 to 10 percent of the total thickness .tau.', and the intermediate region consists essentially of a fiber having a third coefficient of thermal expansion and a matrix material and has a thickness .tau..sub.1 of about 10 to 50 percent of the total thickness .tau.' between the hot side and the cool side. The intermediate region can also consist of a mixture of the two fibers used in the outer regions.

Inventors: Parthasarathy; Triplicane A. (Beavercreek, OH), Kerans; Ronald J. (Yellow Springs, OH)

Assignee: The United States of America as represented by the Secretary of the Air Force

International Classification: C04B 35/80 (20060101); C04B 35/111 (20060101); C04B 035/80 ()

Expiration Date: 06/26/2018