Coated member, coating material, and method of manufacturing coated member

A coating material comprising a zirconia-dispersed silicate in which ytterbia-stabilized zirconia is precipitated as a dispersed phase in a matrix phase which is any one of a rare earth disilicate, a rare earth monosilicate, and a mixed phase of the rare earth disilicate and the rare earth monosilicate,

• wherein the rare earth disilicate is any one of a (Y1-a[Ln1]a)2Si2O7 solid solution (here, Ln1 is any one of Sc, Yb, and Lu, a is 0.05 or more and less than 1 when Ln1 is Sc, and a is 0.2 or more and less than 1 when Ln1 is Yb or Lu), Sc2Si2O7, Yb2Si2O7, and Lu2Si2O7,
• the rare earth monosilicate is Y2SiO5, [Ln1′]2SiO5, or a (Y1-b[Ln1′]b)2SiO5 solid solution (here, Ln1′ is any one of Sc, Yb, and Lu, and 0<b≦0.5), and
• the ytterbia-stabilized zirconia contains ytterbia in a content of 8 wt % or more and 27 wt % or less.

A coating material comprising a zirconia-dispersed silicate in which ytterbia-stabilized zirconia is precipitated as a dispersed phase in a matrix phase which is any one of a rare earth disilicate, a rare earth monosilicate, and a mixed phase of the rare earth disilicate and the rare earth monosilicate,

• wherein the rare earth disilicate is any one of a (Y1-c[Ln2]c)2Si2O7 solid solution (here, Ln2 is any one of Nd, Sm, Eu, and Gd, c is 0.1 or more and less than 1 when Ln2 is Nd, Sm, or Eu, and c is 0.2 or more and less than 1 when Ln2 is Gd), Nd2Si2O7, Sm2Si2O7, Eu2Si2O7, and Gd2Si2O7,
• the rare earth monosilicate is Y2SiO5, [Ln2′]2SiO5, or a (Y1-d[Ln2′]d)2SiO5 solid solution (here, Ln2′ is any one of Nd, Sm, Eu, and Gd, and 0<d≦0.5), and
• the ytterbia-stabilized zirconia contains ytterbia in a content of 8 wt % or more and 27 wt % or less.

A method of manufacturing a coated member, the method comprising:

• forming a heat-shielding coating layer on a substrate by spraying particles onto a substrate made of a silicon-based ceramic or a ceramic fiber-reinforced ceramic matrix composite, the particles being obtained by mixing any one of rare earth disilicate powder, rare earth monosilicate powder and mixed powder of the rare earth disilicate powder and the rare earth monosilicate powder with ytterbia-stabilized zirconia powder containing ytterbia in a content of 8 wt % or more and 27 wt % or less and heat-treating the obtained mixed powder at a temperature of 100° C. or more and 1700° C. or less,
• wherein the rare earth disilicate powder is made of any one of a (Y1-a[Ln1]a)2Si2O7 solid solution (here, Ln1 is any one of Sc, Yb, and Lu, a is 0.05 or more and less than 1 when Ln1 is Sc, and a is 0.2 or more and less than 1 when Ln1 is Yb or Lu), Sc2Si2O7, Yb2Si2O7, and Lu2Si2O7, and
• the rare earth monosilicate powder is made of any one of Y2SiO5, [Ln1′]2SiO5, and a (Y1-b[Ln1′]b)2SiO5 solid solution (here, Ln1′ is any one of Sc, Yb, and Lu, and 0<b≦0.5).

A method of manufacturing a coated member, the method comprising:

• forming a heat-shielding coating layer on a substrate by spraying particles onto a substrate made of a silicon-based ceramic or a ceramic fiber-reinforced ceramic matrix composite, the particles being obtained by mixing any one of rare earth disilicate powder, rare earth monosilicate powder and mixed powder of the rare earth disilicate powder and the rare earth monosilicate powder with ytterbia-stabilized zirconia powder containing ytterbia in a content of 8 wt % or more and 27 wt % or less and heat-treating the obtained mixed powder at a temperature of 100° C. or more and 1700° C. or less,
• wherein the rare earth disilicate powder is made of any one of a (Y1-c[Ln2]c)2Si2O7 solid solution (here, Ln2 is any one of Nd, Sm, Eu, and Gd, c is 0.1 or more and less than 1 when Ln2 is Nd, Sm, or Eu, and c is 0.2 or more and less than 1 when Ln2 is Gd), Nd2Si2O7, Sm2Si2O7, Eu2Si2O7, and Gd2Si2O7, and
• the rare earth monosilicate powder is made of any one of Y2SiO5 and a (Y1-d[Ln2′]d)2SiO5 solid solution (here, Ln2′ is any one of Nd, Sm, Eu, and Gd, and 0<d≦0.5).