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HomeMaterials Science ForumMaterials Science Forum Vols. 486-487Oxidation of SiOC Composite Having Dispersoids of...

Oxidation of SiOC Composite Having Dispersoids of Mo_4.8Si₃C_0.6 and MoSi₂

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Abstract:

New ceramic composites that consist of the amorphous SiOC matrix having dispersoids of Mo4.8Si3C0.6 and some MoSi2 were synthesized, and their oxidation characteristics were investigated between 450 and 1050oC in air. The SiOC matrix was obtained by converting polymethylsiloxane via pyrolysis. The good oxidation resistance of the prepared composites originated from a thin, protective SiO2 layer formed on the surface. But the outermost oxide surface was porous, owing to the formation of the highly volatile MoO3, which was formed together with SiO2.

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Eco-Materials Processing & Design VI

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Periodical:

Materials Science Forum (Volumes 486-487)

Pages:

165-168

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.486-487.165

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Online since:

June 2005

Authors:

Dong Bok Lee, Seung Wan Woo

Keywords:

Composite, Mo_4.8Si₃C_0.6, MoSi₂, Oxidation, SiOC

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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[10] [20] [30] [0] D C.

[0] Mo O Si D C 10µm (b).

[10] [10] [60] [0] F E.

[0] Mo O Si E F 10µm (c) 900oC/50hr Counts (x10) Counts (x10) Counts (x10).

[10] [50] [0] [60] B A.

[0] Mo Scale Si A B 50µm (a) 600oC/50hr epoxy Scale Matrix epoxy Matrix Scale Matrix Scale epoxy O Matrix Scale Matrix Scale Matrix 1050oC/50hr.

DOI: 10.2514/6.2022-0379.vid

[10] [20] [30] [0] D C.

[0] Mo O Si D C 10µm (b).

[10] [10] [60] [0] F E.

[0] Mo O Si E F 10µm (c) 900oC/50hr Counts (x10) Counts (x10) Counts (x10).

[10] [50] [0] [60] B A.

[0] Mo Scale Si A B 50µm (a) 600oC/50hr epoxy Scale Matrix epoxy Matrix Scale Matrix Scale epoxy O Matrix Scale Matrix Scale Matrix 1050oC/50hr Fig. 4. SEM cross-sectional image and the corresponding EDS line profiles of SiOC/Mo4. 8Si3C0. 6/MoSi2 composite after oxidation for 50 hr. (a) 600 oC, (b) 900 o C, and (c) 1050 oC.

DOI: 10.2514/6.2022-0379.vid