Deposition Kinetics of the Cristobalite Aluminum Phosphate Coating on SiC Coated Carbon/Carbon Composites Prepared by Hydrothermal Electrophoretic Technique

Abstract:

Article Preview

Cristobalite aluminum phosphate (C-AlPO4) coatings were prepared by hydrothermal electrophoretic process on SiC coated C/C composites at different temperatures. The as-prepared C-AlPO4 coatings was characterized by SEM analyses. The influence of hydrothermal deposition temperature on the microstructures of the as-prepared coatings and the deposition kinetics mechanism were investigated. Results show that dense and homogeneous C-AlPO4 coatings on SiC coated C/C composites can be achieved at 373K and 220V deposition voltage; Kinetics investigations show that the deposition process of the C-AlPO4 coatings on SiC coated C/C composite is controlled by the diffusion rate of the charged C-AlPO4 particles to the cathode; the deposition rate increases with the increase of hydrothermal temperature. The diffusion equation and the kinetic expression of coating process follow the Fick’s second law and Ahrennius relationship. The deposition activation energy of the C-AlPO4 coatings fabricated by the hydrothermal electrophoretic process is calculated to be 21.88kJ/mol.

Info:

Periodical:

Key Engineering Materials (Volumes 434-435)

Edited by:

Wei Pan and Jianghong Gong

Pages:

492-495

DOI:

10.4028/www.scientific.net/KEM.434-435.492

Citation:

W. D. Yang et al., "Deposition Kinetics of the Cristobalite Aluminum Phosphate Coating on SiC Coated Carbon/Carbon Composites Prepared by Hydrothermal Electrophoretic Technique", Key Engineering Materials, Vols. 434-435, pp. 492-495, 2010

Online since:

March 2010

Export:

Price:

$35.00

In order to see related information, you need to Login.

In order to see related information, you need to Login.