Strengthening and Strength Uniformity of Structural Ceramics.
Abstract
Stresses created by differential sintering, due to differences in initial bulk density, were determined experimentally. The experiments entailed determining the shrinkage rates of a powder isostatically pressed to two different bulk densities. Using this information, stresses were determined by forcing the slower densifying compact to shrink at the same rate as the faster densifying compact and measuring the resulting forces with a load cell. Maximum stresses (between 200 and 400 psi) were observed to occur in the intermediate stage of densification. Despite larger differential strains at higher temperatures, stresses decreased to zero at the latter stage of densification. Viscoelastic experiments, of the stress relaxation type were performed. Results showed that the sintering specimen was more rigid at lower temperatures and more fluid-like at higher temperatures, to explain the development of maximum stresses at intermediate temperatures.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1983
- Accession Number
- ADA129570
Entities
People
- F. F. Lange