Abstract
In this paper, polycrystalline cubic boron nitride (PcBN) with Ti3AlC2–Al as the compound binder was manufactured by high-temperature and high-pressure (HTHP) method. Effects of Ti3AlC2 decomposition on PcBN microstructural features and mechanical properties at different sintering temperatures were systematically analyzed. Results revealed that sintering temperature of 1350 °C was critical temperature for complete Ti3AlC2 decomposition under HTHP conditions. Sintering driving force improved with increasing temperature, resulting in significant enhancement of PcBN compactness. In addition, decomposition products of Ti3AlC2 reacted with cBN to form TiC, TiB2, and AlN, improving the adhesion between cBN grains. At 1450 °C, as-prepared composites with the highest relative density value (99.6%), bending strength (586.22 MPa) and Vickers hardness (48.8 GPa) were attained. Moreover, at 1300 °C, fracture toughness of PcBN was 7.18 MPa m1/2.
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