Production method for thermal spray particles, turbine member, gas turbine, and thermal spray particles

A production method for thermal spray particles terming a ceramic layer which is formed on a heat-resistant alloy substrate used in a turbine member and includes a plurality of pores inside and in which vertical cracks extending in a thickness direction are dispersed in a surface direction,

• the method comprising:
• adjusting a solid content concentration of slurry formed by mixing a material of the thermal spray particles, water, and a dispersant to 75 wt % to 85 wt %;
• supplying the slurry to a disk-shaped atomizer of a spray drying device;
• setting a protrusion speed at which the slurry protrudes from the atomizer to 60 m/second to 90 m/second by adjusting a rotating speed of the atomizer;
• and
• drying the slurry in the spray drying device to form thermal spray particle bodies and performing a heal treatment on the thermal spray particle bodies to produce thermal spray particles composed of YbSZ in which a 50% particle diameter in a cumulative particle-size distribution is 40 μm to 100 μm.