الفهرس Only 14 pages are availabe for public view
 |  | from | 147 |  |  |
| | | from | 147 | | |
Abstract
Oxy-acetylene powder spraying technique is applied ..employing austenitic alloy steel in powder form sprayed by an oxy-acetylene spraying gun. The technique is carried out without preheating the sprayed surface. Bonding powder is employed to make adhesive substrate before spraying the basic powder which is sprayed in successive passes till reaching the required deposit thickness. Special disc specimens (shear test specimens) of St42 are sprayed at different spraying parameter* (normal least distance between the spraying nozzle and the sprayed surface, the rotating speed of the specimens, the transverse speed of the spraying gun and the deposit thicknesses). The adhesion strength of specimens is examined via special hard steel die
placed on the tensile-compression testing machine of
~*
12.5 ton capacity. That is done by shearing the deposited sprayed layer off the parent material.
The adhesion strength of deposits mainly depends on the mechanical meshing among sprayed particles.