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Characterization of protective coatings for planar automotive gas sensors |
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| Authors: | Stephen Roger A Paolo Timothy I Marco F Valerie Alison |
| Affiliation: | aJohnson Matthey Technology Centre, Blount's Court, Sonning Common, Reading RG4 9NH, UK bDepartment of Physics and Centre for Advanced Microscopy, JJ Thomson Physical Laboratory, University of Reading, Whiteknights, PO Box 220, Reading RG6 6AF, UK cCentro Ricerche Fiat, Emissions Aftertreatment, Advanced Process Technologies, Strada Torino, 50-10043 Orbassano (TO), Italy |
| Abstract: | Alumina support material suitable for use as a planar automotive gas sensor support was coated in thin films of yttria-stabilised zirconia (YSZ) and titania. The morphology, composition, thickness and homogeneity of the coating was measured. The coating was applied to the ‘green’ form of a tape cast alumina substrate which was subsequently fired at 1500 °C to produce the final form of the coated alumina. The YSZ coating gave a continuous  5 μm thick coating with no evidence of mixed oxide formation between the YSZ and the alumina substrate. XRD indicated a face centred cubic Y doped ZrO2 or primitive tetragonal Zr0.9Y0.1O1.95 phase. The titania coatings were much thinner (<1 μm) with signs of trace amounts of aluminium titanium oxide (Al2TiO5) as well as rutile titania in XRD. Spot analysis using X-ray photoelectron spectroscopy showed a fairly regular titania coverage. Atomic force microscopy analysis showed a particle size of 1–3 μm for the YSZ coating and 0.5 μm for titania. |
| Keywords: | Titania YSZ Automotive applications Pollution control Coatings |
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