Ceramics in Severe Environments: Proceedings of the Sixth by C. B. Alcock, S. Zador (auth.), Wurth W. Kriegel, Hayne

By C. B. Alcock, S. Zador (auth.), Wurth W. Kriegel, Hayne Palmour III (eds.)

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Extra resources for Ceramics in Severe Environments: Proceedings of the Sixth University Conference on Ceramic Science North Carolina State University at Raleigh December 7–9, 1970

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It was found necessary to perform all preparation steps utilizing xylene as the lubricant in order to protect the boron oxide from moisture. The scales on the oxidized specimens were characterized by standard analytical methods. X-ray diffraction was used initially to identify the reaction products. Scanning electron microscope (SEM) examination of the scale structure was generally performed on specimen surfaces and fractured cross sections. In a few cases it was found beneficial to examine polished cross sections with the SEM.

C. Kuczynski (Univ. of Notre Dame): energy of viscosity for Al203? Authors: It has yet to be determined. What is the activation S. J. p. 2054°C). In your experiments what was the thickness of the container walls, and what magnitudes of pressures are generated within them? 05 in. thick. The internal pressures have not been measured, but will vary with the amount of absorbed gas and the vapor pressure of the sample. 26 BATES, McNEILLY AND RASMUSSEN V. J. Tennery (Oak Ridge National Laboratory): What W contamination levels are observed in oxide samples after melting?

INTRODUCTION A continuing need exists for improved materials for use in the severe environments associated with real and simulated aerospace regimes. Boron nitride and boron nitride composites are being used or considered for use in arc jet engines, plasma accelerators, power supplies for space vehicles, components such as microwave antennas, leading edges, nose cones for hypersonic aircraft, and reentry heat- shields. 1-7 The objective of this investigation was to examine the ablative characteristics of a boron nitride composite and two hot pressed boron nitrides designated as (1) standard and (2) low moisture.

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