| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 701954 | Diamond and Related Materials | 2011 | 6 Pages |
Spark plasma sintering (SPS) was used to synthesize diamond from multiwalled carbon nanotubes (MWCNTs) with Fe35Ni powders as solvent catalysts. The MWCNTs/Fe35Ni mixtures were spark plasma sintered at various conditions. The microstructures and diamond phase were analyzed by using X-ray diffraction, Raman spectroscopy, scanning electron microscopy, and transmission electron microscope techniques. Experimental results showed that the diamond crystals can be synthesized from MWCNTs/Fe35Ni by using the SPS at lower temperature of 1200 °C under very low pressure of 70 MPa. Well-crystallized cubic diamonds consisted of mono-crystals and poly-crystals exhibiting particle sizes ranged from 10 to 40 μm. The Fe35Ni catalysts achieved an effective enhancement for diamond conversion from MWCNTs during the SPS. A model was also proposed to describe the diamond growth and revealed as a layer-by-layer growth mechanism.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Diamond crystals synthesized at 1200 °C, 70 MPa by SPS. ► Layer by layer structures of the synthesized diamond crystals. ► TEM and XRD identifications of the diamond crystals. ► The diamond growth model in the SPS method.
