Design and optimization of oxidation resistant coating for C/C aircraft brake materials
| Autor: | Zuo Li, Litong Zhang, Shangwu Fan, Juanli Deng, Jing Hu, Xu Ma, Zan Xie, Laifei Cheng |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Borosilicate glass Process Chemistry and Technology Oxidation resistant chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Oxygen 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Viscosity Coating chemistry Materials Chemistry Ceramics and Composites engineering Wetting Composite material 0210 nano-technology Layer (electronics) |
| Zdroj: | Ceramics International. 44:175-182 |
| ISSN: | 0272-8842 |
| Popis: | A SiCN/borosilicate glass anti-oxidation coating with double-layer structure was designed for C/C aircraft brake materials. The SiCN layer was introduced as transition layer to improve the wettability between borosilicate glass and C/C composites, and the microstructure results indicated that the coating with SiCN inner layer was dense and uniform. The oxidation resistance evaluation of the coated samples was conducted at 800 °C in air for 10 h. The weight loss of SiCN/borosilicate glass coated samples valued ~ 5.66% indicated that the oxidation resistant property of the simple SiCN/borosilicate glass coating was not good, which was mainly due to the relative large viscosity of borosilicate glass at 800 °C. B 4 C was introduced to add into the outer glass coating to improve the self-healing ability of the coating. After oxidized at 800 °C in air for 10 h, the weight loss of the SiCN/borosilicate glass-B 4 C coated samples was ~ 2.48%. B 4 C could consume the oxygen diffused into the coating and the reacted product B 2 O 3 with a better fluidity at 800 °C could effectively heal cracks and pores in the coating to improve the oxidation resistance property. The reaction of B 4 C oxidized to B 2 O 3 was accompanied with ~ 1.5 times volume expansion, which was also beneficial for the healing of defects. |
| Databáze: | OpenAIRE |
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