PYROCHLORE MATERIALS AND COATING CREATING HEAT BARRIER WITH THOSE PYROCHLORE MATERIALS Russian patent published in 2012 - IPC C22C29/12 C23C30/00 

FIELD: metallurgy.

SUBSTANCE: ceramic pyrochlore material consists of Gd_2-xMg_xZr₂O_7-a with 0<x<2 and 0≤a≤1 or of Gd₂Hf_2-yTi_yO_7-a, where 0<y<2, 0≤a≤1. Ceramic heat barrier coating (19) consists of inner layer (13) and outer layer (16) of ceramic materials chosen from Gd_2-xMg_xZr₂O_7-a, Gd_2-xMg_xZr_2-yTi_yO_7-a, Gd_2-xMg_xZr_2-yHf_yo_7-a, Gd₂._xMg_xHf_2-y-zZr₂Ti_yO_7-a, Gd_2-xMg_xHf₂O_7-a, Gd₂Hf_2-yTi_yO_7-a, Gd_2-xMg_xZr_2-yTi_yO_7-a, Gd_2-x Mg_xTi₂o_7-a, Sm_2-xMg_xZr₂._yO_7-a, Sm₂Hf_2-yTi_yO_7-a, Gd₂Zr_1-yTi_yO_7-a, where 0<x<2, 0≤a≤1, 0<y<2, 0<z<2, y+z<2, and namely from the material of the above mentioned layer (13) or layer (16). In addition, inner layer (13) contains Sm₂._xMg_xZr₂O_7-a and zirconium oxide.

EFFECT: increasing thermal expansion coefficient of ceramic pyrochlore materials.

10 cl, 6 dwg