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To improve the oxidation resistance of short carbon fiber (Csf)-reinforced mechanically alloyed SiBCN (MA-SiBCN) (Csf/MA-SiBCN) composites, dense amorphous Csf/SiBCN composites containing both MA-SiBCN and polymer-derived ceramics SiBCN (PDCs-SiBCN) were prepared by repeated polymer infiltration and pyrolysis (PIP) of layered Csf/MA-SiBCN composites at 1100 °C, and the oxidation behavior and damage mechanism of the as-prepared Csf/SiBCN at 1300–1600 °C were compared and discussed with those of Csf/MA-SiBCN. The Csf/MA-SiBCN composites resist oxidation attack up to 1400 °C but fail at 1500 °C due to the collapse of the porous framework, while the PIP-densified Csf/SiBCN composites are resistant to static air up to 1600 °C. During oxidation, oxygen diffuses through preexisting pores and the pores left by oxidation of carbon fibers and pyrolytic carbon (PyC) to the interior of the matrix. Owing to the oxidative coupling effect of the MA-SiBCN and PDCs-SiBCN matrices, a relatively continuous and dense oxide layer is formed on the sample surface, and the interfacial region between the oxide layer and the matrix of the as-prepared composite contains an amorphous glassy structure mainly consisting of Si and O and an incompletely oxidized but partially crystallized matrix, which is primarily responsible for improving the oxidation resistance.


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Novel Csf/SiBCN composites prepared by densifying Csf/MA-SiBCN with the PIP process: Oxidation behavior and damage mechanism

Show Author's information Wenhao Dou1,2Daxin Li1,2( )Bingzhu Wang1,2Zhihua Yang1,2,3Jun Chen4Dechang Jia1,2( )Ralf Riedel5Yu Zhou1,2,6
Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Key Laboratory of Advanced Structural-Functional Integration Materials and Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China
Chongqing Research Institute of HIT, Chongqing 401135, China
Beijing Institute of Control Engineering, Beijing 100094, China
Institut für Materialwissenschaft, Technische Universität Darmstadt, Darmstadt D-64287, Germany
School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China

Abstract

To improve the oxidation resistance of short carbon fiber (Csf)-reinforced mechanically alloyed SiBCN (MA-SiBCN) (Csf/MA-SiBCN) composites, dense amorphous Csf/SiBCN composites containing both MA-SiBCN and polymer-derived ceramics SiBCN (PDCs-SiBCN) were prepared by repeated polymer infiltration and pyrolysis (PIP) of layered Csf/MA-SiBCN composites at 1100 °C, and the oxidation behavior and damage mechanism of the as-prepared Csf/SiBCN at 1300–1600 °C were compared and discussed with those of Csf/MA-SiBCN. The Csf/MA-SiBCN composites resist oxidation attack up to 1400 °C but fail at 1500 °C due to the collapse of the porous framework, while the PIP-densified Csf/SiBCN composites are resistant to static air up to 1600 °C. During oxidation, oxygen diffuses through preexisting pores and the pores left by oxidation of carbon fibers and pyrolytic carbon (PyC) to the interior of the matrix. Owing to the oxidative coupling effect of the MA-SiBCN and PDCs-SiBCN matrices, a relatively continuous and dense oxide layer is formed on the sample surface, and the interfacial region between the oxide layer and the matrix of the as-prepared composite contains an amorphous glassy structure mainly consisting of Si and O and an incompletely oxidized but partially crystallized matrix, which is primarily responsible for improving the oxidation resistance.

Keywords: polymer infiltration and pyrolysis (PIP), oxidation damage mechanism, mechanically alloyed SiBCN (MA-SiBCN), polymer-derived ceramics SiBCN (PDCs-SiBCN), short carbon fiber-reinforced SiBCN (Csf/SiBCN) composites

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Received: 25 October 2023
Revised: 03 March 2024
Accepted: 30 March 2024
Published: 21 May 2024

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© The Author(s) 2024.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 52372059, 52172068, 52232004, and 52002092), the Heilongjiang Natural Science Fund for Young Scholars (No. YQ2021E017), the Fundamental Research Funds for the Central Universities (No. 2022FRFK060012), the Heilongjiang Touyan Team Program, and the Advanced Talents Scientific Research Foundation of Shenzhen: Yu Zhou. This work was also funded by the Beijing Engineering Research Center of Efficient and Green Aerospace Propulsion Technology and Advanced Space Propulsion Laboratory of BICE (No. LabASP-2023-11), the Huiyan Action (No. 1A423653), and the Key Technologies R&D Program of CNBM (No. 2023SJYL05). Ralf Riedel also gratefully acknowledges the financial support provided by the Research Training Group 2561 “MatCom-ComMat: Materials Compounds from Composite Materials for Applications in Extreme Conditions” funded by the Deutsche Forschungsgemeinschaft (DFG), Bonn, Germany.

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