Si sub(3)N sub(4)-metal interface structure by laser melting

Si sub(3)N sub(4) - Metal interface structure of the coating melted by high power CO sub(2) laser on X60CrMnMoVNbN2110 steel was studied. The fine structure of coating layer - transition region, matrix - transition region were analysed by high power X - ray diffractrometer and high resolution electron microscopy. Phase structure in the interface region was studied by electron diffraction, its phase composition was studied by EDS. The result have shown, the joining between the coating layer and the substrate was a metallurgical combination. At radiating by Si sub(3)N sub(4) have wetted all over down by the adhesion agent which was consisted of WC and Co. Electron metallograph reveal, the laser radiating induce Si sub(3)N sub(4) grain to forming microtwinning Domains and Antiphase domains.