| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Coatings to Protect Materials from Extreme Environments
|
| Presentation Title |
Cathodic Arc Deposition of Silicon Aluminum Nitride Coating on SiC |
| Author(s) |
Emmanuel Ernest Boakye, Ming Ming Chen, Kristin Keller, Brian Sirn, Rabi Bhattacharya, A.K Rai |
| On-Site Speaker (Planned) |
Emmanuel Ernest Boakye |
| Abstract Scope |
A silicon aluminum nitride (SiAlN) based nanocomposite bond coat comprising 20:80 Si3N4:AlN volume ratio was deposited on Hexoloy SiC substrate using direct cathodic arc (DC) and filtered arc (FA) methods. The coatings were produced using a 20% Si - aluminum alloy in nitrogen. The coated substrates were characterized for uniformity of Si3N4/AlN nanocomposite mixture by SEM-EDX. SEM cross sectional examination showed continuous 20µm well adhered coating on SiC. The coated substrates were thermally cycled at 1480°C for up to 50 times in 50% H2O, 50% oxygen environment. The SiAlN phase transformed to mullite with a trace amount of silica. The SiAlN coating adhesion prior to and after thermal cycling was evaluated using scanning electron microscopy and X-ray diffraction. |