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Ultrahard and stable nanostructured cubic boron nitride from hexagonal boron nitride
- Source :
- Ceramics International. 46:12788-12794
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Cubic boron nitride (cBN), a typical superhard material, has garnered significant interest for both fundamental scientific research and technical applications. Here, nanostructured cBN with high-density nanotwins and stacking faults was synthesized by rapid quenching using hexagonal boron nitride (hBN) as the starting material at a moderate temperature (2200 K) and low pressure (13 GPa). This synthetic nanostructured cBN exhibits high Vickers hardness (78 GPa), high fracture toughness (11.8 MPa·m1/2), and extremely high oxidization temperature (1565 K). We propose that the refined grain structure and excellent mechanical properties of the cBN synthesized in this study is attributed mainly to dislocation slips and (111) mechanical nanotwins that dominate this phase transformation.
- Subjects :
- 010302 applied physics
Quenching
Toughness
Materials science
Process Chemistry and Technology
Stacking
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
chemistry.chemical_compound
chemistry
Boron nitride
Phase (matter)
0103 physical sciences
Vickers hardness test
Superhard material
Materials Chemistry
Ceramics and Composites
Composite material
Dislocation
0210 nano-technology
Subjects
Details
- ISSN :
- 02728842
- Volume :
- 46
- Database :
- OpenAIRE
- Journal :
- Ceramics International
- Accession number :
- edsair.doi...........5dbc3a2d321466f3bd8205ce4f2ca624