Effects of environment on creep behavior of two oxide/oxide ceramic–matrix composites at 1200 °C

Cyclic creep and recovery behavior of Nextel™720/alumina ceramic composite at 1200°C

“…For each environment, maximum stress levels were selected according to the results of the previous study [27] to be above the run-out stresses established in sustained creep tests. The hold time was 1 h in all cyclic creep-recovery tests performed in air and in the 100 MPa test performed in steam.…”

“…A shorter hold time of 0.05 h was used in the 125 MPa test performed in steam. The choice of a reduced hold time was dictated by a short creep lifetime of 0.24 h obtained at 125 MPa in steam [27].…”

“…Results of cyclic creep-recovery tests are summarized in Table 1, where results of the sustained creep tests from prior work [27] are included for comparison. Strain response of the specimens subjected to cyclic creep-recovery tests at 1200 • C in air is shown in Fig.…”

Sol–gel approach to near-net-shape oxide–oxide composites reinforced with short alumina fibres—The effect of crystallization

“…The conventional methods of producing CMCs are hot pressing [4], melt infiltration [5], chemical vapour infiltration (CVI) [6], slurry infiltration-high pressure sintering (SI-HPS) [3,7,8] and sol-gel [3,[8][9][10][11][12][13][14]. Radsick et al [8] fabricated oxide/oxide matrix composites by slurry infiltration-hot pressing sintering technique (SI-HP).…”

“…Radsick et al [8] fabricated oxide/oxide matrix composites by slurry infiltration-hot pressing sintering technique (SI-HP). Recently Ruggles-Wrenn et al [14] have studied the environmental effects on the creep behaviours of oxide/oxide ceramic matrix composites prepared by sol-gel technique. Dey et al [11] have fabricated near-net-shape fibre reinforced ceramic matrix composites by sol infiltration technique.…”