Fracture behavior of advanced ceramic hot-gas filters

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We have evaluated the microstructural/mechanical, and thermal shock/fatigue behavior and have conducted stress analyses of hot-gas candle filters made by various manufacturers. These filters include both monolithic and composite ceramics. Mechanical-property measurement of the composite filters included diametral compression testing with O-ring specimens and burst testing of short filter segments using rubber plug. In general, strength values obtained by burst testing were lower than those obtained by O-ring compression testing. During single-cycle thermal-shock tests, the composite filters showed little or no strength degradation when quenched from temperatures between 900 and 1000{degrees}C. At higher quenching temperatures, slow strength degradation was observed. ... continued below

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13 p.

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Singh, J.P.; Majumdar, S.; Sutaria, M. & Bielke, W. May 1, 1996.

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Description

We have evaluated the microstructural/mechanical, and thermal shock/fatigue behavior and have conducted stress analyses of hot-gas candle filters made by various manufacturers. These filters include both monolithic and composite ceramics. Mechanical-property measurement of the composite filters included diametral compression testing with O-ring specimens and burst testing of short filter segments using rubber plug. In general, strength values obtained by burst testing were lower than those obtained by O-ring compression testing. During single-cycle thermal-shock tests, the composite filters showed little or no strength degradation when quenched from temperatures between 900 and 1000{degrees}C. At higher quenching temperatures, slow strength degradation was observed. The monolithic SiC filters showed no strength degradation when quenched from temperatures of up to {approx}700-900{degrees}C, but displayed decreased strength at a relatively sharp rate when quenched from higher temperatures. On the other hand, a recrystallized monolithic SiC filter showed higher initial strength and retained this strength to higher quenching temperatures than did regular SiC filters. This may be related to the difference in strength of grain boundary phases in the two cases. In thermal cycles between room temperature and 800- 1000{degrees}C, both monolithic and composite filters show a small strength degradation up to three cycles, beyond which the strength remained unchanged. Results of rubber-plug burst testing on composite filters were analyzed to determine the anisotropic elastic constants of the composite in the hoop direction. When these results are combined with axial elastic constants determined from axial tensile tests, the composite can be analyzed for stress due to mechanical (e. g., internal pressure) or thermal loading (thermal shock during pulse cleaning). The stresses can be compared with the strength of the composite to predict filter performance.

Physical Description

13 p.

Notes

OSTI as DE96011129

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  • 10. annual conference on fossil energy materials, Knoxville, TN (United States), 14-16 May 1996

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  • Other: DE96011129
  • Report No.: ANL/ET/CP--89702
  • Report No.: CONF-9605167--1
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/237337 | External Link
  • Office of Scientific & Technical Information Report Number: 237337
  • Archival Resource Key: ark:/67531/metadc670759

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  • May 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Dec. 16, 2015, 12:31 p.m.

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Singh, J.P.; Majumdar, S.; Sutaria, M. & Bielke, W. Fracture behavior of advanced ceramic hot-gas filters, report, May 1, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc670759/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.