Thermal barrier coating material

摘要

There is provided a novel thermal barrier coating material which does not have a problem of phase transition, whose melting point is higher than its working temperature range, whose thermal conductivity is smaller than that of zirconia, and whose thermal expansion coefficient is greater than that of zirconia. The thermal barrier coating material comprises as a main component, a composition having an orthorhombic or monoclinic structure derived from perovskite (for example, a tabular perovskite structure expressed by the composition formula A₂B₂O₇), or a tetragonal layer structure having a c axis/a axis ratio equal to or greater than 3 (for example, a K₂NiF₄ structure, a Sr₃Ti₂O₇ structure, or a Sr₄Ti₃O₁₀ structure), a composition expressed by the composition formula LaTaO₄, or a composition having an olivine type structure expressed by the composition formula M₂SiO₄ or (MM')₂SiO₄ (where M, M' are divalent metal elements).