Re-sintered boron-rich polycrystalline cubic boron nitride...

Details Re-sintered boron-rich polycrystalline cubic boron nitride... Re-sintered boron-rich polycrystalline cubic boron nitride...

C - Chemistry, Metallurgy

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B

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C01B 21/064 (2006.01) C01B 35/14 (2006.01) C04B 35/5831 (2006.01) C09K 3/14 (2006.01)

Patent

CA 1260672

RE-SINTERED BORON-RICH POLYCRYSTALLINE CUBIC BORON NITRIDE AND METHOD FOR MAKING SAME ABSTRACT OF THE DISCLOSURE Disclosed is a method for making re-sintered polycrystalline CBN compact which comprises placing sintered boron-rich polycrystalline CBN particles in a high temperature/high pressure apparatus and subjecting said boron-rich CBN particles to a pressure and a temperature adequate to re-sinter said particles, the temperature being below the reconversion temperature of CBN, for a time sufficient to re-sinter the polycrystalline CBN particles therein. The boron-rich polycrystalline CBN particles in the HP/HT apparatus contain no impurity which would interfere with the sintering process (CBN sintering inhibiting impurities) and no sintering aid material.

528040

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