Fabricating Nanocrystalline Diamond Ceramics by a Shock Compaction Method

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Abstract
Nanocrystalline diamond ceramics—namely, polycrystalline diamond compact consisting of ultrafine grains (one to hundreds of nanometers)—have been produced without any sintering additives via a shock compaction method using commercial diamond powders which consist of monocrystalline or shock‐synthesized polycrystalline particles less than 1 μ in diameter. The method exploits plastic deformation of diamond and requires a precise spatial and timely partitioning of shock‐induced thermal energy. Although much yet remains to be done for practical applications, the superior advantages of using ultrafine powders are supported by the experimental results and the theoretical modeling and considerations which are applicable to advanced ceramics.