Temperature analysis of the powder streams in coaxial laser cladding

Abstract The powder stream temperature of a newly developed coaxial laser cladding technique have been calculated and measured in this study. A simplified one-dimensional model of the particle heating problem under laser irradiation was solved with various conditions of laser intensity, particle size and flow velocity. The experimental results have been successfully detected by a pin-hole infrared sensor with the temperature calibration for hot particles. The thermal profiles of the coaxial nozzle give an optimum operation range of the stand-off distance for coaxial laser cladding.

[1]  V. Pustovalov,et al.  Heating, evaporation and combustion of a solid aerosol particle in a gas exposed to optical radiation. , 1989 .

[2]  R. Clift,et al.  Bubbles, Drops, and Particles , 1978 .

[3]  R. D. Hudson.  Infrared System Engineering , 1969 .

[4]  Jerzy K. Fiszdon.  Melting of powder grains in a plasma flame , 1979 .

[5]  E. Pfender,et al.  Unsteady heating and radiation effects of small particles in a thermal plasma , 1982 .

[6]  J. Szekely,et al.  Plasma-particle interactions in plasma spraying systems , 1992 .

[7]  C. Trassy,et al.  Experimental investigation of powder vaporization in thermal plasma jets , 1991 .

[8]  T. Ueda,et al.  Studies on Temperature of Abrasive Grains in Grinding—Application of Infrared Radiation Pyrometer , 1985 .

[9]  E. Pfender,et al.  Heat transfer to a single particle exposed to a thermal plasma , 1982 .

[10]  G. S. Romanov,et al.  The theory of heating and evaporation of a spherical particle exposed to optical radiation , 1985 .

[11]  T. Ueda,et al.  Measurement of Grinding Temperature Using Infrared Radiation Pyrometer With Optical Fiber , 1986 .

[12]  M. Boulos,et al.  Simultaneous particle surface temperature and velocity measurements under plasma conditions , 1995 .

[13]  K. Akashi,et al.  Particle heating in a radio-frequency plasma torch , 1977 .

[14]  Emil Pfender,et al.  Generation and behavior of fine particles in thermal plasmas—A review , 1985 .

[15]  V. Pustovalov,et al.  Thermal processes in gas-powder laser cladding of metal materials , 1993 .

[16]  P. Fauchais,et al.  Pyrometer system for monitoring the particle impact on a substrate during a plasma spray process , 1994 .

[17]  E. Pfender.  Particle behavior in thermal plasmas , 1989 .