Slurry for thermal spraying, thermal sprayed coating, and method for forming thermal sprayed coating

A thermal spray slurry comprising a flocculant and ceramic particles having an average particle size of 200 nm or more and 5 μm or less, the ceramic particles consist of yttrium oxide and contained in the thermal spray slurry in an amount of 50% by mass or less,

• wherein precipitates formed when 700 mL of the thermal spray slurry is placed in a 16.5-cm-high cylindrical vessel having a volume of 1 L and a central axis and is allowed to stand still at room temperature for 1 week are made to disappear by disposing, at a temperature of 20° C. or higher and 30° C. or lower, the cylindrical vessel so as for the central axis of the cylindrical vessel to be horizontal and by rotating the cylindrical vessel at a rotation speed of 100 rpm for 120 minutes around the central axis of the cylindrical vessel to stir the thermal spray slurry in the cylindrical vessel.