In-flight particle temperature measurements during atmospheric plasma spraying (APS) of Tungsten, Molybdenum, and Yttria stabilized Zirconia by two-color pyrometry are analyzed statistically. The particle temperature distributions allow assessing the melting status of the particles. Particularly the melting temperature and the particle fractions being still molten or already solidifying can be identified. Furthermore, the relevant systematic and material dependant sources for measurement errors using two-color pyrometry are investigated. Their influence is estimated and corrected best possible. As far as there is reliable data available on the emissivity of the powder material there is good agreement between the corrected measured melting temperatures and reference data.

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