Barium titanate/noble metal laminates prepared by the oxidation of solid metallic precursors
| Autor: | M. M. Antony, Kenneth H. Sandhage |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Materials science
Mechanical Engineering Composite number Mineralogy chemistry.chemical_element Dielectric engineering.material Condensed Matter Physics Metal chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials visual_art Barium titanate visual_art.visual_art_medium engineering General Materials Science Noble metal Ceramic Electroceramics Titanium |
| Zdroj: | Journal of Materials Research. 8:2968-2977 |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/jmr.1993.2968 |
| Popis: | A novel and attractive method for preparing multicomponent electronic ceramics and ceramic-metal composites is the oxidation of solid metallic precursors (SMP). This metallurgical processing route consists of the following steps: (i) preparation of a solid metallic precursor containing the proper ratio of elements for the final ceramic or ceramic-metal composite, (ii) compaction and forming of the metallic precursor into a desired shape, and (iii) oxidation to produce a monolithic ceramic or ceramic-metal composite. While the SMP method has been used to prepare wires and tapes containing a variety of superconducting oxides, this method has not been widely used to synthesize other electronic ceramics. In this paper, the synthesis of dielectric BaTiO3/noble metal laminates from solid metallic precursors is discussed. Ba–Ti precursor powders have been produced by solid-state mechanical alloying. The precursor powder was sealed inside noble metal tubes and rolled to form thin Ba–Ti/noble metal laminates. Exposure of the Ba–Ti core in such tapes to temperatures ≥ 300 °C in pure oxygen resulted in rapid oxidation. Post-oxidation annealing at elevated temperatures (≥900 °C) yielded dielectric BaTiO3/Ag or BaTiO3/Pd laminates. |
| Databáze: | OpenAIRE |
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