Coating Materials for Energy (CME)
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Suspension and solution precursor (SSP) thermal spraying

Suspension and solution precursor thermal spraying is an emerging technology which utilises liquid feedstock containing sub-micrometre and nanoparticles. In conventional thermal spraying there are limitations to decreasing coating thickness significantly below ~30 µm and coating surface roughness (Ra) below 5 µm because the individual splats are too coarse. In many applications, a thin and smooth surface layer is required. SSP was developed to circumvent these problems. In SSP HVOF the suspension is directly injected in the combustion chamber and the particles are accelerated to >500 m/s and heated in the spray plume. SSP can potentially bridge the gap between the conventional thin film (~ 5 µm) deposition techniques and traditional thermal spraying (~ 250 µm).

SSP HVOF sprayed YSZ coatings from ethanol based suspension - SSPSSP HVOF sprayed YSZ coatings from ethanol based suspension

water based suspension - SSPYSZ from water based suspension

 

unique microstructural features - SSPUnique microstructural features

SSP HVOF sprayed alumina coating cross-section  - SSPSSP HVOF sprayed alumina coating cross-section

top surface showing individual splats - SSPTop surface showing individual splats

 
A wear track on SSP sprayed alumina coating (against Si3N4 counter-body) showing excellent wear performance  - SSP

A wear track on SSP sprayed alumina coating (against Si3N4 counter-body) showing excellent wear performance

Coating Materials for Energy (CME)

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