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New reinforcing technique of alumina coatings on steel substrates

C. GHEORGHIES1,* , S. CONDURACHE-BOTA1, M. DINESCUa2, C. CONSTANTINESCU2, N. CAZACU3

Affiliation

  1. Faculty of Science, Dunarea de Jos University, 800201 Galati, Romania
  2. National Institute for Laser Physics, Plasma and Radiation INFLPR, 077125 Magurele, Bucharest, Romania
  3. Faculty of Metallurgy and Materials Science, Dunarea de Jos University, 800201 Galati, Romania

Abstract

Alumina protective coatings were made on steel samples by pulsed laser deposition. Improvement of the thermal shock resistance of the steel is the main purpose of such a steel coating. The adhesion of the aluminum oxide thin layer on the steel base was increased by a whole new technique. Thus, microdimensional holes were done in the coating by a pulsed Nd:YAG laser. The characteristics of the laser and the geometry of the experiment were analyzed and they were chosen and used in order to have a cylindrical shape of the holes and also with the purpose that the laser spot would reach the steel substrate. Thus, small columns of steel emerged through the holes, reinforcing the coatings..

Keywords

Coating, alumina, Pulse laser deposition, Laser drilling, Reinforcement.

Citation

C. GHEORGHIES, S. CONDURACHE-BOTA, M. DINESCUa, C. CONSTANTINESCU, N. CAZACU, New reinforcing technique of alumina coatings on steel substrates, Optoelectronics and Advanced Materials - Rapid Communications, 2, 9, September 2008, pp.569-577 (2008).

Submitted at: July 10, 2008

Accepted at: Aug. 28, 2008