Transient and steady-state erosion of in-situ reinforced silicon nitride
- Allied Signal Research and Technology, Des Plaines, IL (United States)
- Allied Signal, Inc., Morristown, NJ (United States)
- Allied Signal Aerospace, South Bend, IN (United States)
- Michigan Technological Univ., Houghton, MI (United States)
- Argonne National Lab., IL (United States)
Relative to most other materials silicon nitride is very erosion resistant. However, the resulting surface flaws degrade strength - a serious concern for component designers. AlliedSignal Ceramic Components GS-44 in-situ reinforced silicon nitride was eroded in a slinger apparatus. Both transient (extremely low level) and steady-state erosion regimes were investigated. Alumina particles with effective average diameters of 140 Jim and 63 {mu}m were used at velocities of 50 m/s, 100 m/s, and 138 m/s. Biaxial tensile strength was measured. Strength decreased by about 15% after a very small erodent dosage and then remained virtually constant with further erosion. In-situ reinforcement produces R-curve behavior in which the fracture toughness increases with crack size. The effect of this is quite dramatic with strength loss being significantly less than expected for a normal silicon nitride with constant fracture toughness.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 80380
- Report Number(s):
- ANL/ET/CP-84391; CONF-950584-1; ON: DE95013436
- Resource Relation:
- Conference: Annual meeting of the Society of Tribologists and Lubrication Engineers, Chicago, IL (United States), 14-18 May 1995; Other Information: PBD: Oct 1994
- Country of Publication:
- United States
- Language:
- English
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