Effects of steam environment on fatigue behavior of two SiC/[SiC+Si3N4] ceramic composites at 1300°C

Static fatigue of Hi‐Nicalon™‐S fiber at elevated temperature in air, steam, and silicic acid‐saturated steam

“…[7][8][9] Recent studies report severe degradation of high-temperature mechanical performance of SiC-SiC composites in steam. [10][11][12][13][14][15][16][17] Hi-Nicalon™-S SiC fibers are used in many of these SiC-SiC CMCs. 5,6 Oxidation can severely degrade SiC fiber strength, [18][19][20][21] and is therefore a vital concern for SiC-SiC CMCs, particularly in combustion environments and in steam.…”

Fatigue of a SiC/SiC ceramic composite with an ytterbium‐disilicate environmental barrier coating at elevated temperature*

“…All tests were carried out at 1200°C using a uniaxial testing machine (MTS model 810) and a Flex Test 40 digital controller (MTS Corp.). A detailed description of the experimental arrangement is provided elsewhere 18‐20 . Standard dogbone‐shaped specimens used in this study were machined by diamond grinding.…”

“…Consequently, mechanical properties of the composite deteriorate and component life is reduced. In fact, recent studies reported severe deterioration of the mechanical performance of SiC/SiC composites at elevated temperature in steam 17‐21 …”

Creep in interlaminar shear of an Hi-Nicalon™/SiC–B4C composite at 1300℃ in air and in steam

“…Several recent studies investigated mechanical behavior of high-performance SiC/SiC composites at elevated temperature. [17][18][19][20][21][22][23][24][25][26][27] Notably, efforts to evaluate the life-limiting behaviors of SiC/SiC CMCs focused primarily on the fiber-dominated properties. However, fiber-reinforced woven CMCs are often susceptible to failure under interlaminar tensile or shear stress due to the inherent material defects in the matrix-rich or fiber-matrix interface regions.…”