The invention discloses an Yb modified CMAS prevention
composite structure thermal barrier coating and a preparing method thereof. A CMAS
corrosion prevention layer adopts Yb modified
rare earth zirconate to form a compact
layered structure, at the high temperature, the
layered structure can have a reaction with CMAS to form a compact
blocking layer,
permeation of molten CMAS to the interior of the
thermal barrier coating can be prevented, a first heat
insulation layer adopts Yb modified
rare earth zirconate to form a columnar structure, enough heat insulation performance and
high strain tolerance can be provided for the
thermal barrier coating, the
thermal shock property of the thermal barrier
coating is improved, the service life of the thermal barrier
coating can be prolonged, the CMAScorrosion prevention layer and the first heat
insulation layer are made of materials of the same elements, heat mis-match stress between the two
layers can be relieved, combining strength of the two
layers can be improved, the thermal barrier
coating has the advantages of being low in heat conduction rate, stable in phase, high in combining strength, and high in
sintering resisting capacity, the service life under the high-temperature
service condition is long, combination strength between dual
layers of
ceramic can be high, and combination strength between a
ceramic layer and a
metal bondinglayer is high.