Aluminum nitriding by laser

Details Aluminum nitriding by laser Aluminum nitriding by laser

1982-08-27

1984-05-29

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 166, 148437, 148 39, C22F 104

Patent

active

044513020

ABSTRACT:
Nitriding a workpiece of aluminum or aluminum alloy by laser treatment in an atmosphere rich in nitrogen is disclosed. Laser treatment is applied for a period of less than one second at a laser power density of at least 0.1.times.10.sup.6 W/cm.sup.2 to form a hard workpiece surface layer comprising aluminum nitride. A workpiece surface pretreatment, prior to exposure to the laser beam, forms a smutty surface layer having a low content of impurities. A preferred embodiment includes utilizing an aluminum alloy containing an amount of at least 5 weight percent silicon and less than 2.1 weight percent magnesium.

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Uglov, "Lasers in Metallurgy and Technology of Inorganic Materials", Sov. Journ. Quant. Electron, vol. 4, No. 5, Nov. 1974, pp. 565-573.
Wakefield, "Laser Right on the Beam for Heat Treating Duty", Iron Age, Feb. 10, 1975, pp. 45-47.
Metals Handbook, 9th Edition, vol. 2, p. 45, Nov. 1979, American Soc. for Metals.
Kudela et al., "Study of Nitridation Process of Aluminum-Magnesium Alloys", Kovove Materialy 6.17-Bratislava, (1979).
J. Chem. Phys. 75(4), Aug. 15, 1981, Taylor et al., "Reaction of N.sub.2.sup.+ Beams with Aluminum Surfaces".
J. Appl. Phys. 52(9), Sep. 1981, Lieske et al., "Formation of Al-Nitride Films at Room Temperature by Nitrogen Ion Implantation Into Aluminum".
Applications of Lasers in Materials Processing, American Society for Metals, (1979), p. 199.

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