Combustion of metals under the action of cw CO₂laser radiation

Abstract

We report the results of ab initio energy-band calculations for the ternary intermetallic compound GdMn 6 Ge 6 . The ferrimagnetic arrangement of Gd and Mn magnetic sublattices is reproduced as well as the average moment per Mn atom. The comparatively low strength of the Gd-Mn effective exchange coupling and the occurrence of a weak orbital polarization (3%) at the manganese sites are further results of this analysis. The numerical results are compared with prior magnetization and hyperfine-field analyses.

Laser Ignition of Bulk Iron, Mild Steel, and Stainless Steel in Oxygen Atmospheres

“…For instance, Bolobov et al (1991Bolobov et al ( , 1992 and Sato et al (1995) used inductive heating. Focalized laser beams (Arzuov et al, 1979;Bransford, 1985;Kirichenko et al, 1989) or collimated xenon lamp beams (Branch et al, 1992;Nguyen and Branch, 1987) have also been used to ignite small bulk metallic samples, with intensities of approximately 1 MW•m −2 . In spite of their obvious advantages over metal wires, as being highly reproducible, contactless, and controllable sources of energy, the low intensity of these light sources (∼ 1MW • m −2 ) leads to durations of the heating process very similar to those obtained with inductive heating (several seconds to several dozens of seconds).…”

Absorption dynamic behaviour of metals during laser solid state treatments

“…(i) by calorimetry in particular thermal configurations (thermal thin plate), which allows one to deduce the absorption coefficient from simple analytic relations with temperature [15,16], and…”