The report is a compilation of 36 papers describing the information discussed at the Thirteenth Refractory Composites Working Group Meeting held at The Olympic Hotel, Seattle, Washington on 18, 19, and 20 July 1967. Representatives of various organizations presented informal discussions of their current activities in the fields of development, evaluation and application of inorganic refractory composites for use in high temperature environments.

This memorandum summarizes information on refractory materials and composites that was presented at the Thirteenth Meeting of the Refractory Composites Working Group in Seattle, Washington on July 18-20, 1966. The memorandum is based on 34 papers that were presented at the meeting. They are reviewed and discussed briefly within the framework of the following four broad areas: materials technology, process technology, specific hardware applications and tests, and evaluation techniques. Included in the section on materials technology are discussions dealing with bulk refractory materials, coated systems, and fiber-reinforced composites. The section on process technology discusses cladding and general fabrication processes. The specific hardware applications and tests cover rocket-motor components, and cladding of a probe used in the glass industry. The section on evaluation techniques covers thermal testing, and non-destructive testing. (Author).

This report summarizes information on refractory composites for use above 2500 F, as presented at the Seventh Meeting of the Refractory Composites Working Group, held March 12-14, 1963. Reports presented at the meeting were concerned with pro tective coatings, insulating ceramics, materials for rocket thrust chambers, dispersion strength ening of metals, joining of refractory materials, and testing techniques. Emphasis in the field of coatings for refractory metals has shifted from the rudiments of developing oxidation-resistant coatings to improvement and advanced evaluation of coatings to predict their utility for re-entry vehicles. (Author).

This memorandum reviews nineteen papers dealing with melting and casting technology of particular interest to DMIC users. The papers were given at the International Metallurgy Conference on June 12-16, 1967 at New York City. These papers were broadly concerned with progress in vacuum-metallurgy technology internationally, materials in vacuum environment, vacuum-metallurgical processes, and vacuum equipment and instrumentation. (Author).

The report summarizes the corrosion behavior of beryllium. The effects on beryllium of the following environments are considered: moisture, salt solutions, acids, alkalis, gases, organic liquids, molten materials, and solid materials. Stress-corrosion cracking and galvanic effects are also discussed. A final section of the report reviews various types of coatings for protection of beryllium from corrosion by a variety of environments.