A Method for Visualizing Grain Morphology of Zirconia-Based Thermal Barrier Coatings
A thermal barrier coating, zirconia-based technology, applied in coatings, metal material coating processes, instruments, etc., can solve problems that affect measurement results
Active Publication Date: 2018-05-11
XI AN JIAOTONG UNIV
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Problems solved by technology
In contrast, the electron backscatter diffraction (EBSD) analysis technique equipped on a scanning electron microscope can also obtain information such as the crystal size and shape, grain boundary, subgrain and crystal orientation inside the coating, but the disadvantage lies in the sample preparation process. Introduced stress can affect the measurement result
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[0021] A method for manifesting the internal grain morphology of a zirconia-based thermal barrier coating, comprising the steps of:
[0022] (1) Using sub-micron YSZ powder raw material, it is sprayed on the aluminum alloy substrate through a plasma spraying system to form a 2mm thick zirconia-based thermal barrier coating;
[0023] (2) The aluminum alloy substrate was peeled off by the wire cutting process, and the metal remaining on the thermal barrier coating was removed by sandpaper; then the thermal barrier coating was divided into 10 coating samples with a size of about 10 mm × 10 mm with a glass knife. and numbered Tu 1 to Tu 10; then use hot-melt adhesive (melting point 60-70°C, such as paraffin) to evenly disperse the coated test pieces of Tu 1 to Tu 8 on a circular grinding disc, and put the grinding disc Place it downward on the automatic grinding machine, grind the surface of the coated test piece, then polish the surface of the test piece with polishing liquid, fi...
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The invention discloses a method for clearing grain morphology of a zirconia based thermal barrier coating. The method is that the thermal etching experience is performed for a polish surface of a plasma spraying coating under different temperature and insulation time, so as to disclose the grain morphology to the maximum after the molten drops are flattened and solidified; a scanning electron microscope is utilized to determine the optimal thermal etching process for clearing the internal grain morphology, size and boundary and other information of the coating; the image method is carried out to quantitatively express the solidified grain morphology and size distribution range of the plasma spraying YSZ coating under extremely large cooling rate. The method is of important reference significance for expression of grain morphology and size of a microstructure of a ceramic coating at different grades and deposited by different spraying methods and also has important theoretical value for understanding the formation mechanism and structural design in plasma spraying for preparing a high-temperature thermal barrier coating.
Description
technical field [0001] The invention relates to a method for manifesting the internal grain morphology of a thermal barrier coating in a turbine engine and a large gas turbine. Background technique [0002] Plasma sprayed zirconia-based ceramic thermal barrier coatings have been widely used in the hot end parts of gas turbine engines, which can effectively reduce the heating temperature of the substrate. For example, in conjunction with blade film cooling technology, a zirconia thermal barrier coating with a thickness of 100-500 μm is prepared on the surface of a turbine engine blade, which can reduce the surface temperature of the Ni / Co-based superalloy substrate by 100-300 ° C, thereby significantly improving The thermal efficiency, working stability and comprehensive performance of the aero-engine are improved. Plasma spraying coating is formed by a series of molten particles (droplets) hitting the substrate, flowing laterally, spreading, rapidly cooling, and solidifying...
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IPC IPC(8): G01Q30/20G01Q30/02C23C4/11C23C4/134
Inventor 白宇王玉刘琨亢永霞宋小龙张利华强永明
Owner XI AN JIAOTONG UNIV