CERAMIC POWDER, CERAMIC LAYER AND LAYER SYSTEM, WITH TWO PYROCHLORE PHASES AND OXIDES

摘要

PPROBLEM TO BE SOLVED: To provide a ceramic powder, a ceramic layer and a layer system which have superior insulating characteristics and superior bonding to a substrate and therefore where the whole layer system has a long life. PSOLUTION: The ceramic powder comprises a mixture of a first pyrochlore phase denoted as ASBx/SBBSBy/SBOSBz/SB(wherein, x2, y2 and z7) and a second pyrochlore phase denoted as A'SBx'/SBB'SBy'/SBOSBz'/SB(wherein, x'2, y'2 and z'7) and a secondary oxide particularly containing an oxide of B or B' particularly in an amount of 0.1-10 wt.% and contains optionally 0.05 wt.% silicon oxide, 0.1 wt.% calcium oxide, 0.1 wt.% magnesium oxide, 0.1 wt.% iron oxide, 0.1 wt.% aluminum oxide and 0.08 wt.% titanium oxide as a sintering auxiliary agent. The ceramic powder comprises particularly two pyrochlore phases and at least one secondary oxide and contains optionally the sintering auxiliary agent. PCOPYRIGHT: (C)2011,JPO&INPIT