Characteristics of Spray Dried Granules as Related to Control of Ceramic Strength Behavior.
BATTELLE COLUMBUS LABS OHIO
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A central problem in structural designing with brittle materials results from an observed size dependence of fracture stress and a related or accompanying stress-distribution dependency. The ultimate goal of this project is to define and explain size-strength relationships exhibited by ceramics that are of interest for Navy structural applications. In the interests of obtaining strength reproducibility in specimens machined from billets of a dry-pressed high-alumina ceramic, physical characteristics of spray-dried granules from several production batches were determined. Appreciable batch-to-batch variation was found in the size distribution, compaction behavior including tap density, and crushing strength of the granules. Also, it was found that the batches varied with respect to the presence of occasional granules containing large pores i.e., hollow granules.
- Ceramics, Refractories and Glass