Measurement of Temperature and Velocity of Thermally Sprayed Particles using Thermal Radiation :

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  • KURODA,Seiji
    Advanced Materials Processing Division, National Research Institute for Metals
  • FUJIMORI,Hideki
    Department of Instrumentation Engineering, Graduate School, Keio University:(Present address)Mitsubishi Electric Corp.
  • FUKUSHIMA,Takeshi
    Advanced Materials Processing Division, National Research Institute for Metals
  • KITAHARA,Shigeru
    Advanced Materials Processing Division, National Research Institute for Metals

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Abstract

Methods to measure the temperature and velocity of thermally sprayed particles have been developed and applied to plasma-sprayed Mo, Ni-Cr alloy, and alumina particles in air. In the temperature measurement, the spectrum of radiation from particles within a cylindrical measurement volume is analyzed by a monocrhomator and compared with the spectra of blackbody radiation to determine the surface temperature of the particles. Spatial filtering technique using four parallel slits is adopted in the velocity measurement. When a single particle travels in front of the slits, radiation passing through the slits is detected by a photo-multiplier, which gives a current signal with four peaks. Then the velocity v of the particle is given by v=d/t, where d is the separation between the neighboring slits and t the period between the peaks. The mean velocity of a dense stream fo particles can be determined by analyzing the power spectrum of the signal. With those methods, the temperature and velocity profiles of sprayed particles with the distance from the outlet of a plasma torch have been measured. The results show that the density and the size of powders have significant influences on these profiles.

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