Patent ID: 7455913

Claim:
A thermal barrier coating, comprising: a graded coating comprising at least one ceramic based compound comprising at least one metal selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutelium, indium, scandium, yttrium, zirconium, hafnium, titanium, and mixtures thereof; wherein the thermal barrier coating comprises a porosity of no more than about 30 percent by volume of the thermal barrier coating, wherein said graded coating comprises said at least one metal present in an amount of about 100% at least at a surface of the thermal barrier coating; wherein said at least one metal reacts with at least one silicate to form a reaction product.