THERMAL BARRIER COATING FILM AND TURBINE MEMBER
The task is to provide a thermal barrier coating film ( 13 ) which exhibits high durability even in a gas turbine that is used under a molten salt environment, such as a heavy oil fired gas turbine, and which can be efficiently formed at low cost without requiring complicated processes, and a thermal barrier coating film ( 13 ) configures a turbine member includes a ceramic material thermally sprayed and formed on a base material ( 10 ) made of a heat resistant alloy, in which ytterbia partially stabilized zirconia is used as the ceramic material of the film ( 13 ), and the porosity of the film ( 13 ) is 5% or more and less than 8%.
1 . A thermal barrier coating film including a ceramic material thermally sprayed and formed on a base material made of a heat resistant alloy constituting a turbine member in a heavy oil fired gas turbine engine using low-quality fuel,
wherein ytterbia partially stabilized zirconia is used as the ceramic material of the film, and a porosity of the thermal barrier coating film is 5% or more and less than 8%.
2 . The thermal barrier coating film according to claim 1 , wherein the porosity is in a range of 5% to 6%.
3 . The thermal barrier coating film according to claim 1 , wherein the thermal barrier coating film in which thermal spray powder which has a particle size distribution in which a 10% particle diameter in a cumulative particle size distribution is 30 μm or more and 100 μm or less, is used as ceramic spray powder for film formation,
the thermal spray powder has a maximum particle diameter of 150 μm or less, and
the thermal spray powder contains particles having a particle diameter of 30 μm at a ratio of 3% or less and particles having a particle diameter of 40 μm at a ratio of 8% or less.
4 . A turbine member comprising:
the thermal barrier coating film according to claim 1 formed on a base material.
5 . The turbine member according to claim 4 , wherein the thermal barrier coating film is formed on a surface of the base material with a bonding layer interposed therebetween.
6 . (canceled)