evident sandwich, and the texture is very compact. Because
the 3Cr13 belongs to martensite stainless steel, the M-pint
is about 300 ◦C, and spraying is a high-speed solidification
process, and then the degree of supercooling is very high, so
a great deal of martensite is produced instantaneously during
spraying.
Dimension together with velocity and temperature of
atomizing particles determine density and bonding strength
of the coating. Experimental results show that atomizing
particle size decreases and velocity increases with the
increasing of atomizing pressure, resulting in improving
coating quality. It can be seen in Fig. 8 that the layer structure
changes from wavilness to lamellae and its thickness
decreases with the increasing of atomizing pressure because