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Coatings 2017, 7(7), 92; https://doi.org/10.3390/coatings7070092

Effect of Si3N4 Addition on Oxidation Resistance of ZrB2-SiC Composites

1
Department of Metallurgical and Materials Engineering, National Institute of Technology Durgapur, West Bengal 713209, India
2
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Bengal 713209, India
*
Author to whom correspondence should be addressed.
Received: 2 June 2017 / Revised: 25 June 2017 / Accepted: 26 June 2017 / Published: 30 June 2017
(This article belongs to the Special Issue Ultrahigh Temperature Ceramic Coatings and Composites)
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Abstract

The oxidation behavior of ZrB2-20 vol % SiC and ZrB2-20 vol % SiC-5 vol % Si3N4 composites prepared by hot-pressing and subjected to isothermal exposure at 1200 or 1300 °C for durations of 24 or 100 h in air, as well as cyclic exposure at 1300 °C for 24 h, have been investigated. The oxidation resistance of the ZrB2-20 vol % SiC composite has been found to improve by around 20%–25% with addition of 5 vol % Si3N4 during isothermal or cyclic exposures at 1200 or 1300 °C. This improvement in oxidation resistance has been attributed to the formation of higher amounts of SiO2 and Si2N2O, as well as a greater amount of continuity in the oxide scale, because these phases assist in closing the pores and lower the severity of cracking by exhibiting self-healing type behavior. For both the composites, the mass changes are found to be higher during cyclic exposure at 1300 °C by about 2 times compared to that under isothermal conditions. View Full-Text
Keywords: borides; ultra-high temperature ceramic composites; oxidation; isothermal; cyclic; residual stress borides; ultra-high temperature ceramic composites; oxidation; isothermal; cyclic; residual stress
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Mallik, M.; Ray, K.K.; Mitra, R. Effect of Si3N4 Addition on Oxidation Resistance of ZrB2-SiC Composites. Coatings 2017, 7, 92.

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