Corrosion protection of SiC-based ceramics with CVD mullite coatings

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Description

SiC based ceramics have been identified as the leading candidate materials for elevated temperature applications in harsh oxidation/corrosion environments. It has been established that a protective coating can be effectively used to avoid problems with excessive oxidation and hot corrosion. However, to date, no coating configuration has been developed that can withstand the rigorous requirements imposed by such applications. Chemical vapor deposited (CVD) mullite coatings due to their desirable properties of toughness, corrosion resistance, and good coefficient of thermal expansion match with SiC are being developed as a potential solution. Formation of mullite on ceramic substrates via chemical vapor deposition ... continued below

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116 p.

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Sarin, V.; Mulpuri, R. & Auger, M. April 20, 1996.

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Description

SiC based ceramics have been identified as the leading candidate materials for elevated temperature applications in harsh oxidation/corrosion environments. It has been established that a protective coating can be effectively used to avoid problems with excessive oxidation and hot corrosion. However, to date, no coating configuration has been developed that can withstand the rigorous requirements imposed by such applications. Chemical vapor deposited (CVD) mullite coatings due to their desirable properties of toughness, corrosion resistance, and good coefficient of thermal expansion match with SiC are being developed as a potential solution. Formation of mullite on ceramic substrates via chemical vapor deposition was investigated. Thermodynamic calculations performed on the AlCl{sub 3}- SiCl{sub 4}-CO{sub 2}-H{sub 2} system were used to construct equilibrium CVD phase diagrams. Through process optimization, crystalline CVD mullite coatings have been successfully grown on SiC and Si{sub 3}N{sub 4} substrates. Results from the thermodynamic analysis, process optimization, and effect of various process parameters on deposition rate and coating morphology are discussed.

Physical Description

116 p.

Notes

OSTI as DE96012321

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  • Other Information: PBD: 20 Apr 1996

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  • Other: DE96012321
  • Report No.: ORNL/Sub--94-SS110/01
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/256785 | External Link
  • Office of Scientific & Technical Information Report Number: 256785
  • Archival Resource Key: ark:/67531/metadc664566

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  • April 20, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Jan. 21, 2016, 7:08 p.m.

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Sarin, V.; Mulpuri, R. & Auger, M. Corrosion protection of SiC-based ceramics with CVD mullite coatings, report, April 20, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc664566/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.