Abstract
A new apparatus was devised for direct phase transformation from hBN to cBN by using the cylindrical explosion. The apparatus consisted of multiple thin-metal foils in a metal tube surrounded by a high efficiency explosive and the spaces between the multiple thin-metal foils were filled with hBN containing a small amount of copper powder. This apparatus was expected to produce higher pressure and temperature than the ordinary cylindrical method. These high pressure and temperature has been proved to be satisfactory to result in the direct phase transformation from hBN into cBN.
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