Non-additive sintering of Si2N2O ceramic with enhanced high-temperature strength, oxidation resistance, and dielectric properties
| Autor: | Lei Su, Kang Peng, Fan Lei, Jiangbo Wen, Hongjie Wang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Process Chemistry and Technology Sintering 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Amorphous solid Flexural strength Homogeneous visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Dielectric loss Ceramic Composite material 0210 nano-technology Oxidation resistance |
| Zdroj: | Ceramics International. 47:25689-25695 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2021.05.295 |
| Popis: | The high-temperature mechanical and dielectric properties of Si2N2O ceramics are often limited by the introduction of a sintering aid. Herein, dense Si2N2O was prepared at 1700 °C by hot-pressing oxidized amorphous Si3N4 powder without sintering additives. A homogeneous network with short-range order and a SiN3O structure was formed in the oxidized amorphous Si3N4 powder during the hot-pressing process. Si2N2O crystals preferentially nucleated at positions within the SiN3O structure and grew into rod-like and plate-like grains. Fully dense ceramics with mainly crystalline Si2N2O and some residual amorphous phases were obtained. The as-prepared Si2N2O possessed a good flexural strength of 311 ± 14.9 MPa at 1400 °C, oxidation resistance at 1500 °C, and a low dielectric loss tangent of less than 5 × 10−3 at 1000 °C. |
| Databáze: | OpenAIRE |
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