Preparation and processing of metal-ceramic composite materials
| Autor: | J. Petrullat, G. Guldner, Boris Breitscheidel, Ch. Egger, S. Ray, Ulrich S. Schubert |
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| Přispěvatelé: | Publica |
| Rok vydání: | 1992 |
| Předmět: |
Materials science
Hydrogen ceramic Non-blocking I/O chemistry.chemical_element Ethylenediamine Condensed Matter Physics metal-ceramic composite Electronic Optical and Magnetic Materials Solvent Metal Hydrolysis chemistry.chemical_compound chemistry Ni/SiO2-composite visual_art Particle-size distribution Materials Chemistry Ceramics and Composites Alkoxy group visual_art.visual_art_medium sol-gel Composite material |
| Zdroj: | ResearcherID |
| ISSN: | 0022-3093 |
| Popis: | The preparation of nanometer-sized Ni particles in a SiO 2 matrix by a three-step procedure is reported. In the first step, metal-organic Ni compounds are dissolved in water and reacted with the ethylenediamine derivative H 2 NCH 2 CH 2 NH(CH 2 ) 3 Si(OEt) 3 (Et=-CH 2 CH 3 ). During this reaction, ammonia-catalysed hydrolysis and condensation of the alkoxy groups take place. After the removal of the solvent, the resulting gel is dried and pyrolysed under oxidation conditions in the second step. The last step involves the reduction of the NiO/SiO 2 composite material in pure hydrogen. The as-prepared product contains homogeneously dispersed Ni particles in the SiO 2 matrix. Depending on the metal loading, the oxidation and reduction conditions, and on the further heat treatment the particle size distribution can be varied in a wide range. |
| Databáze: | OpenAIRE |
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