Porosity in plasma sprayed alumina coatings

摘要

Small-angle neutron scattering (SANS) was used to study the porosity of plasma sprayed deposits of alumina in as-sprayed and heat-treated conditions. SANS results were compared with mercury intrusion porosimetry (MIP) and water immersion techniques. Multiple small-angle neutron scattering yields a volume-weighted effective pore radius (R(sub eff)), for pores with sizes between 0.08 and 10(mu)m, the pore volume in this size region, and from the Porod region, the surface area of pores of all sizes.