HIGHLY PURE POWDER AND COATING MADE FROM SAID POWDER Russian patent published in 2011 - IPC C04B35/486 

FIELD: chemistry.

SUBSTANCE: present invention relates to highly pure zirconium oxide powder for applying coatings on substrates meant for use in conditions with cyclic thermal loads, such as blades, guide devices and on the sealing surface of gas-turbine engines. The highly pure zirconium oxide powder, which is stabilised with yttrium or ytterbium, contains from approximately 0 to approximately 2 wt % hafnium oxide, from approximately 6 to approximately 25 wt % yttrium oxide or from approximately 10 to approximately 36 wt % ytterbium oxide, from approximately 0 to approximately 0.15 wt % impurity oxides. The impurity oxides include the following in wt %: 0-0.02 SiO₂, 0-0.005 Al₂O₃, 0-0.01 CaO, 0-0.01 Fe₂O₃, 0-0.005 MgO, 0-0.01 TiO₂. The coatings which form a thermal barrier have multiple vertical microcracks which are uniformly distributed on the entire coating, which increases resistance of the coatings to thermal fatigue. The coatings are applied via thermal spraying with possible subsequent thermal treatment.

EFFECT: longer service life of coated substrates.

15 cl, 7 ex, 9 tbl, 11 dwg