Potter, David K. and Ahrens, Thomas J. (1987) Dynamic consolidation of diamond powder into polycrystalline diamond. Applied Physics Letters, 51 (5). pp. 317-319. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:POTapl87
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The formation of a polycrystalline solid compact, by fusing an initially porous aggregate of diamond crystals under dynamic shock pressure (7.5–18 GPa), is shown to depend critically on the size of the initial crystals. Porous aggregates of 100–150 µm diameter crystals upon shock compaction produced compacts. These exhibited pronounced fracturing of the individual crystals and showed no evidence of fusion. Aggregates consisting of ultrafine crystals (<5 µm) also exhibited minimal consolidation. However, samples composed of crystals in the range 4–8 µm produced strong fused compacts of polycrystalline diamond. A model calculation indicates that at 10 GPa less than 0.07 mass fraction of the diamond powder can be melted and this molten material is quenched in 0.8 ns for 8-µm-diam crystals.
|Additional Information:||© 1987 American Institute of Physics (Received 26 February 1987; accepted 2 June 1987) This work was supported by the National Science Foundation and under the C.I.T. Program for Advanced Technologies (sponsored by GTE, TRW, Aerojet General, and General Motors) contribution number 4443, Division of Geological and Planetary Sciences. We appreciate the help of Dr. John Armstrong, Dr. Ian Hutcheon, and Chreyl Brigham in obtaining the SEM images, and Dr. Liselotte Schioler and an anonymous reviewer for helpful comments on the manuscript.|
|Subject Keywords:||DIAMONDS; POWDERS; COMPACTING; PRESSURE EFFECTS; COMPACTS; POLYCRYSTALS; POROUS MATERIALS; FRACTURES; VERY HIGH PRESSURE|
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|Deposited On:||18 Oct 2006|
|Last Modified:||26 Dec 2012 09:06|
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