Study of Erosion Mechanisms of Engineering Ceramics.
Abstract
Erosion behavior of hot pressed and reaction bonded Si3N4 was determined using natural quartz particles in the subsonic velocity regime. Six narrow size ranges were used varying between 15 and 385 micrometers average diameter. Erosion behavior of these two forms of Si3N4 was markedly different. It was found that erosion of hot pressed Si3N4 was proportional to particle momentum (mass x velocity) over five orders of magnitude. Erosion of reaction bonded silicon nitride was approximately proportional to the fourth order of both particle size and velocity. Strength of hot pressed Si3N4 was not reduced under these test conditions. However, a major strength decrease was exhibited by the reaction bonded material. Examination revealed that erosion or impact of these materials under these test conditions did not clearly fit the current models for brittle materials, and that more than one mechanism exists. A small test program was performed on a MgF2 target impacted with large SiC particles used as an additive in some aircraft carrier decking. It was found that cracking and material loss was sustained by the target at velocities as low as 15 mps. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1977
- Accession Number
- ADA040341
Entities
People
- Mary Ellen Gulden