Microstructure and ablation performance of dense ZrC-MoSi2 coatings by VLPPS

Thursday, May 27, 2021: 10:45 AM
Mr. Di Wang , State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, China
Dr. Xiao-Tao Luo , State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, China
Prof. Chang-Jiu Li , State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, China
To improve the ablation resistance of carbon/carbon (C/C) composites, ZrC-MoSi2 coatings were deposited by very low pressure plasma spraying (VLPPS) technology using powder mixture of ZrC and MoSi2. The phase composition and microstructure of the coating were characterized. The ablation performance of ZrC-MoSi2 coating was tested by using high temperature plasma jet. To improve the adhesion between C/C composite and ZrC based coating, a SiC bond coat was fabricated by plasma spraying of Si coating followed by heat-treatment. Results show that a dense ZrC-MoSi2 coating with the porosity less than 1% was deposited on SiC-coated C/C composite. The tight bond between ZrC and MoSi2 splats was observed. The ablation resistance of the coating is effectively improved by reducing the porosity compared with coatings prepared by low pressure and atmospheric plasma spraying. The mechanisms of improving ablation resistance of ZrC-MoSi2 coatings are also examined.
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