Ablation Behavior of Low Pressure Plasma Sprayed TiB₂-MoSi₂ Composite Coatings

Abstract:

In this work, TiB₂-MoSi₂ composite coatings with various contents of MoSi₂ (20 vol. % and 40 vol. %, respectively) were fabricated on SiC coated C/C substrates by low pressure plasma spray (LPPS) technique. The microstructure and phase composition of the coatings were characterized. The ablation behaviors of the composite coatings were evaluated and compared with the pure TiB₂ coating using a plasma flame of about 2200°C. The results showed that MoSi₂ was uniformly distributed in the TiB₂ matrix. All the coatings kept intact after the ablation for 60s - 180s, indicating their excellent ablation resistance. The addition of MoSi₂ had great influence on the ablation behavior of the composite coatings. The TiB₂ coating gained mass after the ablation. The mass of the TM20 coating increased firstly (60s and 120s) and then decreased at 180 s. Mass loss was observed for the TM40 coating during the whole procedure of ablation test.

• Periodical: Key Engineering Materials (Volume 697)
• Pages: 685-688
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.697.685
• Online since: July 2016
• Authors: Li Ping Huang, Ya Ran Niu, Hong Li, Mu Su Ren, Xue Bin Zheng*, Jin Liang Sun
• Keywords: Ablation, Composite Coatings, Low Pressure Plasma Spray, TiB₂

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