Development of Spacecraft Materials and Structures Fundamentals.
Abstract
Compacts of boron carbide powders with specific surface area = or > 8 sq m/g were sintered in argon at temperatures near 2200 C. Several of these powders were prepared by attrition milling of abrasive grade boron carbide. Densification to 95+% of theoretical denstiy could be obtained only with compositions that had appropriate amounts of excess carbon. The microstructures were fined grained and uniform but underwent abnormal grain growth above 2235 C accompanied by transgranular microcracking. This grain growth could be inhibited by increasing the carbon content. Mechanical damping capacity was measured by the free beam and cantilevered beam techniques on boron carbide and other materials. Methods to enhance the damping capacity in a beam structure were analyzed. The flexural strength of sintered boron carbide was evaluated and related to powder processing and sintering parameters. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1985
- Accession Number
- ADA161338
Entities
People
- S. L. Dole
- S. Prochazka
Organizations
- General Electric