Micro-sized polycrystalline cubic boron nitride with properties comparable to nanocrystalline counterparts

Comparison of the relationship between hardness and wear resistance of polycrystalline diamond and cubic boron nitride

“…15 Ceramics and cemented carbide possess even lower hardness values. 16 Nevertheless, recent investigations [17][18][19][20][21][22][23][24] have demonstrated that the hardness range of polycrystalline materials can be significantly expanded through advanced high-temperature and high-pressure (HTHP) sintering technology. Different polycrystalline materials with the same hardness can be obtained by adjusting the temperature and pressure during the sintering process, which enables the examination of the wear resistance of distinct materials under the same hardness conditions.…”

Synthesis of Highly Amorphous Fe70Ti2Y6B22 Bulk Alloy with Excellent Thermal Stability by Isothermal Compression under High Pressure

“…The viscosity increases with an increase in the pressure, and the free path of the atom is suppressed, facilitating the formation of the amorphous phase. High-pressure high-temperature (HPHT) processing methods can introduce enough defective structures in materials such as nanotwinned substructures (NTs), twin boundaries (TBs), stacking faults (SFs), and dislocation accumulations, − which greatly increase the internal energy of crystalline materials. The internal energy of the highly defective crystalline phase can be greater than that of the amorphous phase; in principle, the highly defective crystalline phase transforms into an amorphous phase to reduce its free energy .…”