Abstract: A thermal spray slurry of the present invention contains ceramic particles having an average particle size of 200 nm or more and 5 ?m or less. 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 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.

Abstract: A thermal spray slurry of the present invention contains ceramic particles in a content of 10% by mass or more and 85% by mass or less, and has a viscosity of 3,000 mPa·s or less. The ceramic particles have an average particle size of, for example, 1 nm or more and 5 ?m or less. The thermal spray slurry may further contain a dispersant. The thermal spray slurry may further contain a viscosity modifier. The thermal spray slurry may further contain a flocculant.

Abstract: A thermal spray powder of the present invention contains ceramic particles having an average particle size of 1 ?m or more and 20 ?m or less. The ceramic particles have a flowability index value FT of 3 or more measured by using a powder rheometer. The flowability index value FF is determined by measuring the maximum principal stress and the uniaxial collapse stress of the ceramic particles at normal temperature and normal humidity when 9 kPa of shear force is applied to the ceramic particles, and by dividing the measured maximum principal stress by the measured uniaxial collapse stress.