Abstract
Suspension for thermal spraying has to exhibit long-term storage stability and safe handling for becoming established in industry. Especially micron-sized particles are affected by sedimentation and have to be dispersed before use. A possible way to prevent the settlement is to increase suspension viscosity. This work investigates the effect of a rheological additive to ensure storage stability of a 30 wt% α-alumina suspension. The additive changes the flow curve from newtonian to shear thinning and a frequency sweep assesses the sedimentation behaviour. The suspension was sprayed with a High Velocity Suspension Flame Spraying (HVSFS) setup resulting in a finely structured coating. The microstructure, hardness and phase compositions were analysed. The coating shows low porosity, high hardness and a high amount of γ-alumina.
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