Abstract
Creep-rupture behavior of an oxide-oxide continuous fiber ceramic composite (CFCC) consisting of a porous alumina matrix reinforced with laminated, woven mullite/alumina fibers (Nextel™720) was investigated at 1200 and 1330°C in laboratory air and in 100%-steam environment. The composite has no interface between the fiber and matrix, and relies on the porous matrix for flaw tolerance. Tensile creep behavior was examined at 1200 and 1330°C in laboratory air as well as in 100%-steam environment Applied stress levels ranged from 80 to 154 MPa at 1200°C, and from 50 to 100 MPa at 1330°C. Primary and secondary creep regimes were observed and minimum creep rate was reached in all tests. At 1200°C in air, creep rates were 10 -8 - 10 -5 s -1 and maximum time to rupture, 255 h. Rupture strength for the duration of at least 100 hr was 80 MPa. At 1330°C in air, creep-rupture resistance was considerably degraded. Creep rates were 10 -7 - 10 -5 s -1 and maximum time to rupture, 87 h. Presence of steam accelerated creep rates and dramatically reduced creep life at both test temperatures, effects of steam becoming more pronounced at 1330°C.
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