Substantial progress is reported in the development of a high-temperature seal for a solar heated-air cavity receiver during the first six months of the DOE-sponsored advanced development program. Mechanical dome sealing methods are selected as the preferred sealing approach and a free-standing hemispherical dome contact-type seal and a clamped shallow dome seal are chosen for preliminary design, analysis, and fabrication. Analytical and experimental investigations establish the technological foundation of the seal concepts by demonstrating that ceramic domes can be designed to support the combined pressure, thermal stress, and temperature loads of a heated-air receiver, that a mechanical contact seal with a leak rate which is two orders less than the design goal leak rate is feasible, and that metallization of ceramics and the formation of an alternative brazed diaphragm seal are possible.

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