| 摘要 |
A thermal gradient resistant fiber-reinforced composite structure which has a hot operating side and an opposite cool operating side and a thickness &tgr; 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 &tgr;H of about 10 to 90 percent of the total thickness &tgr; between the hot side and the cool side, and the cool region has a thickness &tgr;C of about 90 to 10 percent of the total thickness &tgr;. In a second embodiment, the composite has a hot operating side and an opposite cool operating side and a thickness &tgr;' 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 &tgr;H' of about 10 to 45 percent of the total thickness &tgr;' 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 &tgr;C' of about 45 to 10 percent of the total thickness &tgr;', and the intermediate region consists essentially of a fiber having a third coefficient of thermal expansion and a matrix material and has a thickness &tgr;1 of about 10 to 50 percent of the total thickness &tgr;' 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.
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