Effects of SiC on Oxidation Behavior of ZrB2-Based Composites with MoSi2 and SiC Additives

S.Q. Guo

doi:10.4028/www.scientific.net/KEM.602-603.457

Paper Titles

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Influence of Coated Composite Powders on the Properties of ZrB₂-YAG-Al₂O₃ Ceramics
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 602-603Effects of SiC on Oxidation Behavior of ZrB2-Based...

Effects of SiC on Oxidation Behavior of ZrB₂-Based Composites with MoSi₂ and SiC Additives

Abstract:

In this study, oxidation behavior of ZrB₂-MoSi₂-SiC composite was investigated in the hot-pressed 5-20 vol% SiC-containing ZrB₂-20 vol% MoSi₂-based composites which were exposed to dry air between 1100°C and 1500°C up to 10 hours. The effects of SiC additive on the oxidation behavior were assessed. Experimental results showed that the weight gain due to oxidation exposure in air increased with increasing exposure temperature and exposure time. Parabolic oxidation behavior was observed for all the compositions composites. On the other hand, the weight gain decreased with increasing amount of SiC added. The addition of SiC improved the oxidation resistance of the composites, and the improvement was enhanced with increasing amount of SiC added. In addition, X-ray diffraction was used to identify major crystalline phases present in both the as-received and the post-oxidized composites. The oxidized sample surface was characterized by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The microstructure of the post-oxidized composites consisted of two characteristic regions: oxidized reactive region and unreactive bulk material region. Furthermore, the oxidized reactive region divided into an outermost dense silica-rich scale layer and oxidized reactive mixture layer. The improvement of the oxidation resistance due to the addition of SiC is associated with the presence of the thicker dense outermost scale layer which inhibited inward diffusion of oxygen through it.

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Periodical:

Key Engineering Materials (Volumes 602-603)

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457-462

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https://doi.org/10.4028/www.scientific.net/KEM.602-603.457

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Online since:

March 2014

Authors:

S.Q. Guo*

Keywords:

Composite, Molybdenum Disilicide, Oxidation Behavior, Silicon Carbide (SiC), Zirconium Diboride

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