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李俊峰,罗正平.硅化钽/硅化钼基热防护涂层短时高温结构演化[J].稀有金属材料与工程(英文),2020,49(2):712~717.[Li Junfeng and Luo Zhengping.Microstructure evolution of TaSi2-MoSi2 based thermal protecting coatings with high emissivity[J].Rare Metal Materials and Engineering,2020,49(2):712~717.]
Microstructure evolution of TaSi2-MoSi2 based thermal protecting coatings with high emissivity
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Received:March 10, 2019  Revised:April 28, 2019
DOI:
Key words: TaSi2  MoSi2  thermal protecting coating  microstructure evolution
Foundation item:国家973计划 (2015CB655200),国家自然科学基金(项目批准号:51502069)
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Li Junfeng and Luo Zhengping  
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Abstract:
      A thermal protecting coating was prepared at 1200 ℃ using TaSi2, MoSi2, borosilicate glass powders as the starting materials. Subsequently the thermal protecting coating was heated at 1650℃ for 2 min and cooled naturally to room temperature. The microstructures and composition of the thermal protecting coating before and after heated at 1650℃ were measured by XRD, SEM and EDS. It is found that the surface of the as-prepared thermal protecting coating contained Ta2O5 and small amount of TaSi2. Lots of Ta2O5 sheets were formed in the heating center region of the coating surface after the heating of 1650℃. The section of the coating close to the surface became dense after heating at 1650℃, and the thickness of the dense section was about 23 μm. There is an even distribution for Ta and Mo elements in the element mapping of coating section, that is, the composition of the thermal protecting coating is uniformed.