| Autor: | E. Schierhorn, Dietrich Schultze, H. Preiss |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
chemistry.chemical_classification
Ethylene Materials science Mechanical Engineering Acetylacetone Inorganic chemistry chemistry.chemical_element Polymer Carbide chemistry.chemical_compound chemistry Chemical engineering Mechanics of Materials Molybdenum Reagent Alkoxide General Materials Science Ethylene glycol |
| Zdroj: | Journal of Materials Science. 33:4687-4696 |
| ISSN: | 0022-2461 |
| Popis: | Polymeric precursors for carbothermal reactions were prepared from niobium alkoxide, tantalum alkoxide and molybdenum ethylene glycolate, respectively, by simultaneous reaction with a chelating reagent (acetylacetone) and organic compounds having two or more reactive OH groups, such as ethylene glycol, saccharose, tartaric acid or dihydroxybenzenes. The precursors exist in common polar and non-polar solvents mostly as linear polymers. The viscous solutions show rheological properties that allow for the preparation of polymer fibres and films. At temperatures up to 1500 °C, bulk precursors as well as fibres and films were thermally converted into carbide powders, fibres and coatings. The structural transformations of the polymeric materials into carbides were investigated using simultaneous thermogravimetric–differential thermal analyses (TGA–DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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