Oxidation Behavior of Si-B-C-N Multiphase Ceramic

Ming Wei Chen; Hai Peng Qiu; Wei Jie Xie; Hong Guan

doi:10.4028/www.scientific.net/KEM.726.148

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Oxidation Behavior of Si-B-C-N Multiphase Ceramic
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The Effect of Point Defects Induced by Fast Neutron Irradiation on the Thermal Conductivity of Boron Carbide
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 726Oxidation Behavior of Si-B-C-N Multiphase Ceramic

Oxidation Behavior of Si-B-C-N Multiphase Ceramic

Abstract:

Si-B-C-N ceramics were synthesized by co-pyrolyzing hybrid polymeric precursors of polycarbosilane and polyborazine due to their mutual solubility. The pyrolysis behavior of Si-B-C-N precursor was analyzed by TG-DSC-FTIR-MS coupling technique. The oxidation behavior was studied through static oxidation test. Results showed that oxidation rate of Si-B-C-N multiphase ceramic was greater than that of SiC ceramic obviously, which promoted forming the liquid B2O3 or stable borosilicate glass. The generated glass state oxides acted as a protective layer which could heal the cracks and reduce oxidation rate due to lower vaporization rate and smaller oxygen diffusivity. Furthermore, Si-B-C-N multiphase ceramic shows excellent oxidation resistance and can be kept in service in a long time at 1200°C

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Key Engineering Materials (Volume 726)

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148-152

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https://doi.org/10.4028/www.scientific.net/KEM.726.148

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Online since:

January 2017

Authors:

Ming Wei Chen*, Hai Peng Qiu, Wei Jie Xie, Hong Guan

Keywords:

Oxidation Behavior, Oxygen Diffusivity, Si-B-C-N Multiphase Ceramic

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