COMPOSITION FOR THERMAL BARRIER, MACHINE UNIT FROM SUPERALLOY WITH COATING CONTAINING SUCH COMPOSITION, CERAMIC COATING AND METHOD OF COATING OBTAINING Russian patent published in 2009 - IPC C04B41/87 C23C28/00 C04B35/48 

FIELD: chemistry.

SUBSTANCE: invention relates to composition of ceramic thermal barrier, used in machine units from superalloy. Composition contains base from zirconium oxide, at least one trivalent oxide from group containing erbium oxide, europium oxide, praseodymium oxide, terbium oxide, holmium oxide and their mixtures, allowing to stabilise zirconium oxide and optimally reduce zirconium oxide heat conductivity, and at least one pentavalent oxide from group: niobium oxide, tantalum oxide or their mixture, allowing to reduce number of oxygen vacancies in such way that it was in fact equal to number of oxygen vacancies in partially stabilised zirconium oxide. Said trivalent oxide is present in molar concentration created by the first part, allowing partial stabilisation of zirconium oxide, and by the second part, which introduces point defects into grid, said pentavalent oxide being present in molar concentration equal to molar concentration of said second part of trivalent oxide.

EFFECT: increase of high-temperature strength and reduction of composition heat conductivity.

20 cl, 2 dwg