| http://www.w3.org/ns/prov#value | - repared cubic boron nitride under an ultra-high pressure and at a high temperature (e.g., 5 GPa or more and 1200??? C. or higher), alternatively further adding thereto a cubic boron nitride powder, a binder mainly including TiN or Al2 O3 and, if necessary, a metal and/or a metallic compound, and again carrying out a high-pressure and high-temperature reaction to prepare the cubic boron nitride sin
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