Foaming performance of the closed–pore foamed ceramics using silicon nitride as a foaming agent and sodium tetraborate as a modifier of foaming
| Autor: | Cuicui Lv, Xiangming Li, Qing Yang, Dongyue Sun |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science technology industry and agriculture chemistry.chemical_element Sintering Foaming agent 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Nitrogen chemistry.chemical_compound Viscosity Compressive strength chemistry Chemical engineering Silicon nitride visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium lipids (amino acids peptides and proteins) Ceramic 0210 nano-technology Porosity |
| Zdroj: | Journal of the European Ceramic Society. 41:6330-6337 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2021.06.035 |
| Popis: | Using silicon nitride as a foaming agent and sodium tetraborate as a modifier of foaming, foamed ceramics (FCs) with porous internal structure and dense surface were prepared by a high temperature foaming method based on the foaming mechanism which is simultaneous occurrence of oxygen diffusion from the air into the molten matrix balanced with the generation of the oxidation–derived nitrogen from silicon nitride at a specific molten matrix viscosity. The foaming performance of the FCs was improved significantly by establishing the conditions for the best synergy between the generation rate of the oxidation–derived nitrogen and the viscosity of the molten matrix during sintering. By synergistically changing the proportion of raw materials and the sintering time at 1150–1250 °C, the FCs demonstrated excellent overall properties with a high closed porosity of 89 %, a low bulk density of 0.32 g/cm3 and a relatively high compressive strength of 6.2 MPa. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect