Study of Erosion Mechanisms of Engineering Ceramics, Static Fatigue of Ceramics.
Abstract
Two areas were investigated in this program: solid particle erosion of engineering ceramics and static fatigue of ceramics. In the erosion phase, the target materials investigated were several types of Si3N4, glass bonded Al2O3 and magnesium fluoride. The particle types were SiC and natural quartz sand. Particle sizes ranged between 10 and 1000 microns and particle velocities were in the subsonic regime. The particle size and velocity dependence on erosion, effect of erosion on strength and effect of number of impacts on erosion were determined. It was found that the type of erosion damage produced was more a function of relative target particle properties than of particle size and velocity for the erosion regime investigated. 'Elastic-plastic' impact, which is characterized by plastic deformation in the particle contact area, and radial and lateral cracks propagating outward from the contact area was observed on all targets impacted with SiC particles. Damage from quartz particle impact ranged from elastic-plastic on the relatively soft targets like MgF2 to shallow intergranular chipping with no secondary crack formation for the hard targets such as hot-pressed Si3N4. Static fatigue behavior of four ceramics was determined in various aqueous solutions at temperatures to 900 C.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 31, 1980
- Accession Number
- ADA087959
Entities
People
- Mary Ellen Gulden