Thermal protection blankets, consisting of refractory fiber batting sandwiched between two sheets of woven ceramic fabric, are of interest as a lower cost alternative to rigid tiles for protection of re-entry vehicles. These blankets require a coating on the outer woven sheet that infiltrates and stiffens the fabric to provide an aerodynamic surface. The coating must act as a high temperature starch, without causing embrittlement of the fabric. Advanced coating systems based on monazite, a weak interphase for oxide composites, are being investigated as a means to increase the service temperatures of thermal protection blankets for re-entry space craft. Preliminary evaluations, including chemical compatibility, tensile strengths of coated, heat-treated fibers and fabrics, and durability in a modulated wind tunnel facility have been conducted.
Ceramic composites for thermal protection systems
Keramische Verbundwerkstoffe für thermische Schutzsysteme
1999
6 Seiten, 5 Bilder, 1 Tabelle, 4 Quellen
Conference paper
English
Ceramic composite thermal protection systems
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