科研之友
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摘要
Cold sprayed coatings offer several advantages over the more traditional thermal spray systems due to the low temperatures involved. The coating is created by propelling powder particles at high velocities resulting in deformation and bonding with the substrate. The adhesion strength of the deformed particle (known as a splat) is determined by several factors including particle projectile velocity, gas temperature, gas pressure and substrate surface roughness. Currently techniques used to measure the adhesion strength of cold spray coatings are difficult and require plates with specific geometries to be spray coated and subjected to a tensile peel-off test. This paper describes a new technique using SPM imaging combined with nanoscratch testing to quantitatively measure the surface adhesion strength of individual ceramic splats and thus determine the overall adhesion of the coating to the substrate. Our results quantitatively show that increasing gas pressure from 0.4 MPa to 1 MPa increased splat adhesion. We also found that smaller splats (< 5 mu m) had higher adhesion strengths than larger splats (> 5 mu m).
- 出版日期2010-12
