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Microstructure evolution of TaSi2-MoSi2 based thermal protecting coatings with high emissivity
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Aerospace Research Institute of Materials and Processing Technology

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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.

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[Li Junfeng, 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.]
DOI:10.12442/j. issn.1002-185X. QH20190016

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History
  • Received:March 10,2019
  • Revised:April 28,2019
  • Adopted:October 23,2019
  • Online: March 12,2020
  • Published: