Zirconia submicron

The prototype shell-and-tube type cross-flow filtration modules (Pall Corp.) used for filtration tests are welded into a stainless steel shell enclosure. The modules have an inlet (filtrate) and outlet (retentate) port (both at tube sides) with Vi-inch tubing ends, and a permeate port, located near the midpoint of the shell side of the unit. The stainless steel filter membranes have a nominal pore size of 0.1 pm. The surface of the filter media is coated with a proprietary submicron layer of zirconia. 

FIGURE 12.7 (a) Scanning electron micrograph (SEM) of a mullite matrix CMC reinforced with submicronic zirconia (fiber diameter 12 pm), (b) TEM of a cobalt dispersion in an aluminosilicate matrix synthesized by the infiltration-H2 firing route. ... 

The submicron-sized and nanosized light-sensitive polyelectrolyte containers have been proposed and laser-stimulated release of corrosion inhibitor from their inner volume was studied. It was shown that the release of corrosion inhibitors from containers embedded into the silica-zirconia based sol-gel matrix under UV or IR laser irradiation ensures effective suppression of corrosion at the damaged sites at the surface of the coating. The possibility of controlling the release properties of polyelectrolyte containers by tuning the illumination wavelength and intensity of the incident laser beam makes the proposed method to be a versatile tool for corrosion protection. 

In a similar work, ultrasound radiation was used to prepare EU2O3 doped in zir-conia and yttrium-stabilized zirconium (YSZ) nanoparticles [83]. Europium oxide was also coated sonochemically on the surface of submicron spherical zirconia and YSZ, which were fabricated by wet chemical methods. Time decay measurements of the doped and coated materials were conducted using a pulsed laser source. Lifetimes < 1.1 ms radiative lifetime of the Eu+ ions were detected for the doped and coated as-prepared materials. When the doped and coated samples were an-... 

Fig. 7 shows the porosity dependence of the tensile moduli experimentally measured (by the resonant frequency technique) for alumina, zirconia and alumina-zirconia composites (ZTA and ATZ) prepared from submicron oxide powders using starch as a pore-forming agent (com starch with a median size of approx. 14 micrometers and potato starch with a median size of approx. 50 micrometers). The processing method is starch consolidation casting, cf. the details given and references cited in [Pabst et al. 2004b, 2005],... 

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