Fabrication on Polycrystalline Caβ″-Al₂O₃ Tube

Caβ"-Al₂O₃ is a fast ion conductor of divalent cation conducting. It can be used to determine the activity of CaO in slag directly and be made a probe for determining the low oxygen in iron. The fabrication of Polycrystalline Caβ"-Al₂O₃ ceramic tube by slip casting are introduced and the effect of medium,Powder size and temperature on the quality of the tube are described too. For the slip casting, methanolic slips and powder molds were used. The high density (97% theoretical density) and heavy textured fired tubes were obtained after sintering for 2 hours at 1670℃.
For checking the electrochemical properties of Caβ"-Al₂O₃ a Galvanic cell to determine the high temperature thermodynamic properties of the. La-O-F system was constructed in this work.
The activities of calcia in. Caβ"-Al₂O₃ at 1113-1333 K were measured by the following cell
Pt|CeO₂ (s), CeF₃ (s),CaF₂ (s), CaO (β") CSZ|O₂ (air)|Pt.