SOLIDIFICATION MECHANISM OF LASER REMELTED BIOACTIVE HA COATINGS

Chuanzhong Chen, Diangang Wang, Quanhe Bao, Liang Zhang and Tingquan Lei
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Chuanzhong Chen: School of Materials Science and Engineering, Shandong University, Ji'nan 250061, P. R. China
Diangang Wang: School of Materials Science and Engineering, Shandong University, Ji'nan 250061, P. R. China
Quanhe Bao: School of Materials Science and Engineering, Shandong University, Ji'nan 250061, P. R. China
Liang Zhang: School of Materials Science and Engineering, Shandong University, Ji'nan 250061, P. R. China
Tingquan Lei: School of Materials Science and Engineering, Shandong University, Ji'nan 250061, P. R. China;

Surface Review and Letters (SRL), 2005, vol. 12, issue 05n06, 819-823

Abstract: In this paper, as-sprayed HA coatings were remelted byCWlaser. The morphologies and the development of microstructures were analyzed by electron probe microanalysis. The solidification mechanism of laser remelted bioactive HA coatings is usually determined by the parameters of the temperature gradientGand the solidification velocityR. In the region of bottom pool, theG/Rvalue is high which will result in the forming of planar crystal. With the decrease ofG/Rvalue, cellular and cellular dendrites will form. Near the surface, the coating can radiate heat to the atmosphere which will form a negative temperature gradient, consequently the structure is composed of dendrites.

Keywords: Hydroxyapaptite; solidification mechanism; laser remelting; temperature gradient; solidification velocity (search for similar items in EconPapers)
Date: 2005
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DOI: 10.1142/S0218625X05007682

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