High-pressure Sintering of Boron Carbide-Titanium Diboride Composites and Its Densification Mechanism
| Autor: | Liwen Lei, Zhengyi Fu, Fan Zhang, Dangqiang Wang, Jinyong Zhang, Jiancheng Gao |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Stacking Sintering chemistry.chemical_element 02 engineering and technology Boron carbide 021001 nanoscience & nanotechnology Microstructure 01 natural sciences chemistry.chemical_compound chemistry High pressure 0103 physical sciences General Materials Science Composite material 0210 nano-technology Boron Titanium diboride Powder mixture |
| Zdroj: | Journal of Wuhan University of Technology-Mater. Sci. Ed.. 35:356-362 |
| ISSN: | 1993-0437 1000-2413 |
| DOI: | 10.1007/s11595-020-2264-y |
| Popis: | A high-pressure hot-pressing process was applied to densify a commercial boron carbide-titanium diboride (B4C-TiB2) powder mixture. Nearly fully dense (98.6%) materials were obtained at 1 700 °C under a pressure of 100 MPa. Compared to the sintering temperature required to achieve similar results when a pressure of only 30 MPa was applied, the sintering temperature was found to decrease by about 200 °C under pressure of 100 MPa. Analysis of the thermodynamics and microstructure showed that the plastic deformation of the B4C grains induced by high pressure dominated the densification mechanism when high pressure was applied. Furthermore, higher pressure resulted in remarkably improved mechanical properties of the composites, which could be traced back to the generation of stacking faults in the B4C grains and aggregation of TiB2. |
| Databáze: | OpenAIRE |
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