| Macroscopic Wear Behavior of C/C and C/C-SiC Composites Coated with Hafnium Carbide |
| Kee Sung Lee, Ihn Cheol Sihn1, Byung-Joo Lim1, Kwang Hyun Lim1 |
School of Mechanical Systems Engineering, Kookmin University
1Daiyang Industrial Co., Ltd. |
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| ABSTRACT |
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This study investigates the macroscopic wear behaviors of C/C and C/C-SiC composites coated with hafnium carbide (HfC). To improve the wear resistance of C/C composites, low-pressure chemical vapor deposition (LPCVD) was used to obtain HfC coating. The CVD coatings were deposited at various deposition temperatures of 1300, 1400, and $1500^{circ}C$. The effect of the substrate material (the C/C substrate, the C/C-CVR substrate, or the C/C-SiC substrate deposited by LSI) was also studied to improve the wear resistance. The experiment used the ball-on-disk method, with a tungsten carbide (WC) ball utilized as an indenter to evaluate the wear behavior. The HfC coatings were found to effectively improve the wear resistance of C/C and C/C-SiC composites, compared with the case of a non-coated C/C composite. The former showed lower friction coefficients and almost no wear loss during the wear test because of the presence of hard coatings. The wear scar width was relatively narrower for the C/C and C/C-SiC composites with hafnium coatings. Wear behavior was found to critically depend on the deposition temperature and the material. Thus, the HfC-coated C/C-SiC composites fabricated at deposition temperatures of $1500^{circ}C$ showed the best wear resistance, a lower friction coefficient, and almost no loss during the wear test. |
| Key words:
Wear, C/C composite, Hafnium carbide, Coatings |
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