METHOD OF PROCESSING A BODY OF POLYCRYSTALLINE DIAMOND MATERIAL
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Dec 20, 2012
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Dec 29, 2011
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Abstract
A method of processing a polycrystalline diamond (PCD) material having a non-diamond phase comprising a diamond catalyst/solvent and/or one or more metal carbides, comprises leaching an amount of the diamond catalyst/solvent and/or one or more metal carbides from the PCD material by exposing at least a portion of the PCD material to a leaching solution. The leaching solution comprises nitric acid diluted in water, wherein the nitric acid is between around 2 to 5 wt % in the nitric acid and water mixture, and one or more additional mineral acids.
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