LASER-SURFACE COATING OF A BIOCERAMIC COMPOSITE LAYER

In this paper laser surface coating of a step bioceramic composite lay er which was preformed by paving step bioceramic or CaHPO4.2H2O-CaCOa powders on austenic stainless steel was studied. The results of scanni ng electron microscopy, electron diffraction spectroscopy and X-ray di ffraction analyses show that the main factors that are advantageous to the formation of the bioceramic coating are the lower power and highe r scan speed of the laser, when the ratio CaHPO4-2H2O/CaCO3 is larger than that in the usual composition of hydroxyapatite. The composite bi oceramic coatings include Ca5(PO4)3(OH). Small non-crystalline zones c an be formed with laser surface coating.