|
| Abstract No.: |
|
Scheduled at:
|
Wednesday, June 07, 2017, Hall 27 11:10 AM
Ceramic Coatings
|
|
| Title: |
High temperature oxidation resistance of thermally sprayed SiC coating
|
|
| Authors: |
Fahmi Mubarok* / Sepuluh Nopember Institute of Technology, Indonesia
Nuria Espallargas/ Norwegian University of Science and Technology, Dept. Engineering Design and Material., Norway
|
|
| Abstract: |
High temperature oxidation resistance of silicon carbide (SiC) coating deposited through plasma spraying (APS) and high velocity oxy fuel (HVOF) system was investigated in this study. The SiC powders were manufactured using co-precipitation techniques to deliver nano-films of Yttrium Aluminum Garnet (YAG) that protect and bind SiC particles. Nevertheless, this oxide transform into amorphous phase after coating deposition. The kinetic behaviour of freestanding SiC coating was tested over short times at 800, 1000 and 1200 C using thermogravimetric analysis technique. Furnace oxidation tests was also carried out on the as-sprayed samples at 800, 1000, 1200 C in air from 1 hour up to 100 hours. The morphological changes and phase transformation were analysed using scanning electron microscopy, EDS and x-ray diffraction. The heating actually allow recrystallization of amorphous YAG phase and prevent SiC particles from oxidizing up to 1000 C. Higher than this point, the SiO2 layer start to form and generate crack within the coatings causing the degradation of coating structure.
|
|