Dense and crack-free mullite films obtained from a hybrid sol–gel/dip-coating approach
| Autor: | Ruslan Burtovyy, Igor Luzinov, Zhaoxi Chen, Fei Peng, Konstantin G. Kornev |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Nanoparticle Sintering Mullite 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Dip-coating Amorphous solid law.invention Mechanics of Materials law 0103 physical sciences General Materials Science Composite material Crystallization 0210 nano-technology Glass transition Sol-gel |
| Zdroj: | Journal of Materials Research. 32:1665-1673 |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/jmr.2017.122 |
| Popis: | A novel hybrid processing has been developed to achieve dense and crack-free mullite films with large critical thicknesses. The amorphous solid nanoparticles obtained from the mullite sol–gel precursor were mixed with the same liquid precursor to form stable suspensions, which were subsequently used to form mullite coatings with the dip-coating method, followed by drying and firing. The hybrid precursor suspensions resulted in highly close-packed nanoparticles, which reduced shrinkage during sintering. Selecting the solvent with a low evaporation rate and high surface tension can effectively eliminate the surface instability caused by the lateral flow during solvent evaporation. The mullite film density was significantly improved at low sintering temperatures, because of the high packing density and viscous flow at above the glass transition temperature of the amorphous gel nanoparticles before crystallization. Dense and crack-free mullite films with 500–600 nm thickness can be obtained from the novel hybrid approach. |
| Databáze: | OpenAIRE |
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