Powder for thermal spraying

A method for manufacturing a powder for thermal spraying, comprising:

• mixing a mixture comprising yttrium oxide, aluminum oxide, and a dispersing medium with a mixing machine to obtain a slurry,
• preparing a sample of a powder for thermal spraying from a part of the slurry and confirming whether the sample meets a requirement (A), and
• preparing a powder for thermal spraying also from the remaining slurry if the sample meets the requirement (A), or adjusting mixing of the remaining slurry if the sample does not meet the requirement (A),
• wherein the mixing machine (i) has a storage part that stores a medium therein and an agitating blade that rotates in the storage part to agitate the mixture together with the medium, or (ii) has a storage part that stores a medium therein, the storage part rotating and thereby agitating the mixture together with the medium, and
• wherein the requirement (A) is:
• the powder for thermal spraying, when subjected to component analysis at any plurality (n) of positions of a scanning electron microscope image (SEM image) by an energy dispersive X-ray spectrometer (EDX) in which characteristic X-ray peak areas are measured, and a content of the element yttrium (CY(at %)) and a content of the element aluminum (CAl(at %)) are calculated from a ratio of the peak areas and determined so as to satisfy a relationship of the following expression (1):
• [
• Expression
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• =
• 100
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• and a coefficient of variation (α) of an average content of the element yttrium [CY]av(at %) calculated by dividing a total value by n, the total value being obtained by adding a content of the element yttrium [CY] at each position represented by the following expression (2):
• [
• Expression
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• 2
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• is 7.0% or less.