MACROLAMINATE PARTICLE COMPOSITE MATERIAL DEVELOPMENT
Abstract
A study was made of the effect of particle geometry, forming methods, sintering and metalto-ceramic ratio on the strength, ductility and oxidation resistance of a refractory laminate particle composite material, 93.1 HfO2.4. 9CeO2. 2MgO-Mo. Cutting and sizing techniques were developed to produce different sizes and shapes of laminate particles. Highest flexural strength was achieved from elongated particles and smaller particles produced higher strength than larger particles. There were indications that ductility increases with increasing laminate particle size. Oxidation resistance and ductility are more subject to variation due to impurities than to particle geometry. Flexural strength was found to increase at a decreasing rate with metal content; while ductility increased at an increasing rate. Compressive strength and oxidation resistance both increased at increasing rates with increasing ceramic content. Isotatic pressing produces very random orientation of laminae. Warm pressing in steel dies produces some orientation while hot pressing produces the highest degree of orientation. Atmosphere, temperature, time at temperature and heating and cooling rates were evaluated. Differential shrinkage between the metal and ceramic phases was found to be critical.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1965
- Accession Number
- AD0464507
Entities
People
- F. H. Simpson
- L. M. Stejskal
Organizations
- Boeing