Influence of pressure on the oxidation resistance of carbon fiber reinforced ZrB2/SiC composites at 2000 and 2200 °C

2021 ◽  
Vol 184 ◽  
pp. 109377
Author(s):  
Antonio Vinci ◽  
Thomas Reimer ◽  
Luca Zoli ◽  
Diletta Sciti
Keyword(s):  
Carbon Fiber ◽  
Oxidation Resistance ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced ◽  
Sic Composites

Fabrication of Mullite Coating and its Oxidation Protection for Carbon Fiber Reinforced SiC Composites

2016 ◽  
Vol 697 ◽  
pp. 476-480 ◽  
Author(s):  
Kuan Hong Zeng ◽  
Qing Song Ma ◽  
Li Hui Cai
Keyword(s):  
Carbon Fiber ◽  
Flexural Strength ◽  
Oxidation Resistance ◽  
Dip Coating ◽  
Solid Content ◽  
Fiber Reinforced ◽  
Good Oxidation Resistance ◽  
Mullite Coating ◽  
Carbon Fiber Reinforced ◽  
Sic Composites

To protect carbon fiber-reinforced SiC (C/SiC) composites against oxidation,mullite coating was prepared on C/SiC composites by dip-coating method with high solid content Al2O3-SiO2 sol as raw materials. X-ray diffraction and scanning electron microscopy were employed to analyze the phase and microstructure of the coating. The results show that the as-prepared coating is SiO2-rich, monolithic and well bonded with substrate without penetrating crack, giving rise to good oxidation-resistance. After soaked at 1400°C for 30min under static air, the coated C/SiC composites possess 87% of original flexural strength. As a result of sealing and filling of cracks and pores by viscous SiO2 in coating, the coated C/SiC composites exhibit improved oxidation resistance at 1500°C and 1600°C. There is no change in flexural strength after oxidized at 1500°C and 1600°C for 30min, respectively. Nevertheless, the carbothermal reduction between viscous SiO2 and free carbon in C/SiC substrate would occur obviously when oxidation temperature was elevated or oxidation time was prolonged, leading to local foaming in coating and decreasing in oxidation resistance.

Thermal ablation behavior of SiC coating for 3D braided carbon fiber reinforced ZrC-SiC composites in different heat fluxes

Vacuum ◽  
2018 ◽  
Vol 156 ◽  
pp. 334-344 ◽  
Author(s):  
Xiao-Hui Yang ◽  
Ke-Zhi Li ◽  
Long-teng Bai ◽  
Zhi-gang Zhao ◽  
Yi Wang
Keyword(s):  
Carbon Fiber ◽  
Thermal Ablation ◽  
Heat Fluxes ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced ◽  
Sic Composites

scholarly journals Oxidation behaviors of carbon fiber reinforced multilayer SiC-Si3N4 matrix composites

2022 ◽  
Vol 11 (2) ◽  
pp. 354-364
Author(s):  
Xiaolin Dang ◽  
Donglin Zhao ◽  
Tong Guo ◽  
Xiaomeng Fan ◽  
Jimei Xue ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Oxidation Resistance ◽  
Chemical Vapor ◽  
Local Stress ◽  
Chemical Vapor Infiltration ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced ◽  
Si3n4 Matrix ◽  
Oxidation Behaviors

AbstractOxidation behaviors of carbon fiber reinforced SiC matrix composites (C/SiC) are one of the most noteworthy properties. For C/SiC, the oxidation behavior was controlled by matrix microcracks caused by the mismatch of coefficients of thermal expansion (CTEs) and elastic modulus between carbon fiber and SiC matrix. In order to improve the oxidation resistance, multilayer SiC-Si3N4 matrices were fabricated by chemical vapor infiltration (CVI) to alleviate the above two kinds of mismatch and change the local stress distribution. For the oxidation of C/SiC with multilayer matrices, matrix microcracks would be deflected at the transition layer between different layers of multilayer SiC-Si3N4 matrix to lengthen the oxygen diffusion channels, thereby improving the oxidation resistance of C/SiC, especially at 800 and 1000 °C. The strength retention ratio was increased from 61.9% (C/SiC-SiC/SiC) to 75.7% (C/SiC-Si3N4/SiC/SiC) and 67.8% (C/SiC-SiC/Si3N4/SiC) after oxidation at 800 °C for 10 h.

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