Dispersion of Lead Zirconate Titanate for Fused Deposition of Ceramics
| Autor: | Stephen C. Danforth, Daniel J. Shanefield, T.F. McNulty, Ahmad Safari |
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| Rok vydání: | 1999 |
| Předmět: |
Thermogravimetric analysis
Materials science Inorganic chemistry Oleyl alcohol Lead zirconate titanate Toluene chemistry.chemical_compound Oleic acid Adsorption chemistry Materials Chemistry Ceramics and Composites lipids (amino acids peptides and proteins) Stearic acid Nuclear chemistry Stearyl alcohol |
| Zdroj: | Journal of the American Ceramic Society. 82:1757-1760 |
| ISSN: | 1551-2916 0002-7820 |
| Popis: | A study of the adsorption of several surfactants onto lead zirconate titanate (PZT) powder was performed. The adsorption of oleyl alcohol, stearyl alcohol, oleic acid, and stearic acid onto PZT-5H powder (surface area = 2.58 m2/g) was measured by thermogravimetric analysis. Toluene was used as a solvent, and the solution concentrations were set at 50.0 g/L. It was found that the stearic acid adsorption onto the PZT-5H powder was highest, to the extent of 8.1 mg/m2. Trace amounts of stearyl alcohol adsorbed onto PZT, showing an adsorption of 0.8 mg/m2. Both oleyl alcohol and oleic acid showed no measurable adsorption. Once stearic acid was found to be a suitable surfactant for fused deposition of ceramics (FDC), the coating process was studied to further optimize the amount adsorbed. A total of six solution concentrations, varying from 5.0 to 70.0 g/L stearic acid in toluene, were tested. It was found that a solution concentration of 30.0 g/L stearic acid was sufficient to provide maximum coverage of the PZT surface. Increases in concentration beyond 30.0 g/L had no effect on the adsorption of the surfactant. PZT powder coated with stearic acid using this method was compounded with a proprietary thermoplastic binder formulation at 55 vol% PZT. Rheology measurements show that this material exhibits a viscosity adequate for FDC. |
| Databáze: | OpenAIRE |
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