The Paton Welding Journal, 2004, №05

2004 №05 (02)

2004 №05 (04)

---

The Paton Welding Journal, 2004, #5, 11-14 pages

Comparative analysis of laser, plasma and combined methods for heating finely dispersed ceramic particles

A.I. Bushma, A.T. Zelnichenko, I.V. Krivtsun

E.O. Paton Electric Welding Institute of the NASU 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.

Abstract
Temperature fields in finely dispersed ceramic particles (Al2O3 and SiO2) heated by the CO2-laser radiation, argon plasma flow and their combination, using volume, surface and combined heat sources, have been calculated through solving the non-stationary equation of heat conduction for a spherical particle, allowing for dependence of optical and thermal-physical properties of particle materials upon the temperature. Shown is the effect on space-time distribution of temperature of the above particles by a heating method, as well as optical and thermal-physical properties of the materials.
Keywords: laser radiation, plasma flow, finely dispersed ceramic particles, heat source, temperature field, combined laser-plasma heating

References

1. Petrov, S.V., Karp, I.N. (1993) Plasma air-gas spraying. Kiev: Naukova Dumka.
2. Pawlowski, L. (1999) Thick laser coatings. A review. J. Thermal Spray Technol., 8(2), 279-295.
3. Bushma, A.I., Krivtsun, I.V. (2003) Peculiarities of absorption and scattering of different wavelength laser radiation by fine spherical particles. In: Proc, of Int. Conf, on Laser Technologies in Welding and Materials Processing, Katsiveli, Crimea, Ukraine. Kiev: PWI.
4. Bushma, A.I., Krivtsun, I.V. (1992) Peculiarities of heating of fine ceramic particles by laser radiation. Fizika i Khimiya Obrab. Materialov, 2, 40-48.
5. Landau, L.D., Lifshits, E.M. (1982) Electrodynamics of continua. Moscow: Nauka.
6. Brekhovskikh, L.M. (1973) Waves in layered media. Mos¬cow: Nauka.
7. Gvozdetsky, V.S., Zagorodny, A.G., Krivtsun, I.V. et al. (1983) Radiation of heterogeneous plasma sphere. Preprint. Kiev: ITF.
8. Born, M., Volf, E. (1968) Principles of optics. Moscow: Nauka.
9. Zolotoryov, V.M., Morozov, V.N., Smirnova, E.V. (1984) Optical constants of natural and technical media. Refer. Book. Leningrad: Khimiya.
10. Kutateladze, S.S. (1979) Principles of heat exchange theory. Moscow: Atomizdat.
11. Tsvetkov, Yu.V., Panfilov, S.A. (1980) Low-temperature plasma in repair processes. Moscow: Nauka.
12. Boulos, M.I., Fauchais, P., Pfender, E. (1997) Thermal plasmas: Fundamentals and applications. Vol. 1. New York-London: Plenum Press

---

Suggested Citation

A.I. Bushma, A.T. Zelnichenko, I.V. Krivtsun (2004) Comparative analysis of laser, plasma and combined methods for heating finely dispersed ceramic particles. The Paton Welding J., 05, 11-14.

---