Characterization of Ni-doped pyrolyzed phenolic resin and its addition to the Al2O3–C refractories
| Autor: | Nasser Pourmohammadie Vafa, Mohammad Bavand Vandchali, Mahdi Ghassemi Kakroudi, Sina Darban, Firouz Rezaei, Vahid Charkhesht |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Process Chemistry and Technology Reducing atmosphere technology industry and agriculture chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Nickel stomatognathic system chemistry Amorphous carbon Whisker 0103 physical sciences Materials Chemistry Ceramics and Composites Graphite 0210 nano-technology Carbon Pyrolysis Nuclear chemistry |
| Zdroj: | Ceramics International. 46:20954-20962 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2020.05.153 |
| Popis: | The catalytic graphitization of the phenolic resin was investigated in the presence of various amounts of nickel nitrate at 600–1200 °C in a reducing atmosphere for 3 h. For comparison, the effect of catalyzed phenolic resin versus none-catalyzed one was explored on the microstructure and mechanical properties of the Al2O3–C refractory specimens within a range of 800–1400 °C. The phase composition and microstructure evolution were investigated using X-ray diffraction and SEM, respectively. RAMAN spectroscopy was used to measure the graphitization level of phenolic resin. Results indicated that crystalline carbon (graphite) was achieved only from Ni-catalyzed phenolic resin at a high temperature ( ~ 1200 °C ), while non-catalyzed resin led to the formation of amorphous carbon. Mechanical properties of the Al2O3–C specimens were improved due to the presence of catalyzed phenolic resin. SEM results illustrated that the enhancement was associated with the in-situ formation of the SiC phase in whisker shape in the microstructure of specimens containing Ni-catalyzed phenolic resin. |
| Databáze: | OpenAIRE |
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