Transient and steady-state erosion of in-situ reinforced silicon nitride

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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 ... continued below

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19 p.

Creation Information

Karasek, K.R.; Whalen, P.J.; Rateick, R.G. Jr.; Hamilton, A.C. & Routbort, J.L. October 1, 1994.

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  • Karasek, K.R. Allied Signal Research and Technology, Des Plaines, IL (United States)
  • Whalen, P.J. Allied Signal, Inc., Morristown, NJ (United States)
  • Rateick, R.G. Jr. Allied Signal Aerospace, South Bend, IN (United States)
  • Hamilton, A.C. Michigan Technological Univ., Houghton, MI (United States)
  • Routbort, J.L. Argonne National Lab., IL (United States)

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Description

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.

Physical Description

19 p.

Notes

OSTI as DE95013436

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  • Annual meeting of the Society of Tribologists and Lubrication Engineers, Chicago, IL (United States), 14-18 May 1995

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  • Other: DE95013436
  • Report No.: ANL/ET/CP--84391
  • Report No.: CONF-950584--1
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 80380
  • Archival Resource Key: ark:/67531/metadc739564

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  • October 1, 1994

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  • Oct. 19, 2015, 7:39 p.m.

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  • Dec. 11, 2015, 6:46 p.m.

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Karasek, K.R.; Whalen, P.J.; Rateick, R.G. Jr.; Hamilton, A.C. & Routbort, J.L. Transient and steady-state erosion of in-situ reinforced silicon nitride, article, October 1, 1994; Illinois. (digital.library.unt.edu/ark:/67531/metadc739564/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.