Deposition of graded SiO2/SiC coatings using high-velocity solution plasma spray

作者：Miranda F S^*; Caliari F R; Campos T M; Essiptchouk A M; Filho G P

来源：Ceramics International, 2017, 43(18): 16416-16423.

DOI：10.1016/j.ceramint.2017.09.018

• Solution plasma spray
• Supersonic plasma torch
• Ceramic coatings
• Graded coatings

Carbon/carbon (C/C) composites are widely used in structural components, particularly in the aerospace and aeronautics sectors. However, the application of C/C composites is limited by low oxidation resistance at high temperatures. In order to overcome this problem, graded SiO2/SiC coatings were deposited on C/C composites by a high-velocity solution plasma spray (HVSPS) process. Graded coatings were formed by reactions between the Si(OH)(4) sprayed liquid precursor and the C/C substrate; these reactions were promoted by the high temperature of the plasma torch. The morphologies, microstructures, and chemical compositions of the coatings were investigated by X-ray diffraction, Raman spectroscopy, Fourier-transform infrared spectroscopy, and scanning electron microscopy/energy-dispersive X-ray spectroscopy. By altering the deposition time, the coating thickness was controlled, therefore demonstrating SiC formation and realizing graded SiO2/SiC coatings.

• 出版日期2017-12-15