Ultrahigh hardness nano twin diamond bulk materials

摘要

PROBLEM TO BE SOLVED: To provide a superhigh hardness nano-twin crystal diamond bulk material having high hardness, high tenacity, and a wide application range.SOLUTION: In a superhigh hardness nano-twin crystal diamond bulk material in which a crystal grain size is 2-100 nm, the inner part of a crystal grain has a nano-cubic structure having a high-density twin crystal, Vickers hardness is 155-350 GPa and Knoop hardness is 140-240 GPa, the volume is 1-2,000 mm3, and fracture toughness (K1C) is 10-30 MPa-m1/2.SELECTED DRAWING: Figure 6