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Dense polycrystalline cBN (PcBN)–SiCw composites were fabricated by a two‐step method: First, SiO2 was coated on the surface of cubic boron nitride (cBN) particles by the sol‐gel method. Then, silicon carbide whisker (SiCw)‐ coated cBN powder was prepared by carbon thermal reaction between SiO2 and carbon powders at 1500°C for 2 hour. Then, cBN–SiCw complex powders were sintered by high‐pressure and...
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