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Fabijanic, D. M.
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article
The influence of Al2O3 reinforcement on the properties of stainless steel cold spray coatings
Abstract
The effect of Al Oadditions to type 316 austenitic stainless steel cold spray coatings was studied. Adding Al Oto the feedstock powder increased the overall deposition efficiency, though the Al Oitself deposited less efficiently than the stainless steel. Shear testing of the coatings using a shear lug test revealed a change in fracture from cohesive to adhesive with increasing alumina addition. The corrosion behaviour, assessed using anodic polarisation tests of the coatings, showed a shift towards the polarisation behaviour of bulk stainless steel with Al Oadditions. All of these changes in coating behaviour with Al Oadditions suggest an improved degree of metallurgical bonding, likely due to increased plasticity in the stainless steel particles. With the largest Al Oaddition the hardness of the layer increased by 30%, but the corresponding wear rate in ball-on-disc testing reduced by a factor of ten. This suggests a change in wear mode from partially adhesive to abrasive.