Diamond-silicon carbide composite and method
AssigneeThe Regents of the University of California
InventorYusheng Zhao
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Abstract
Uniformly dense, diamond-silicon carbide composites having high hardness, high fracture toughness, and high thermal stability are prepared by consolidating a powder mixture of diamond and amorphous silicon. A composite made at 5 GPa/1673K had a measured fracture toughness of 12 MPa·m1/2. By contrast, liquid infiltration of silicon into diamond powder at 5 GPa/1673K produces a composite with higher hardness but lower fracture toughness.
Claims29
A method for preparing an uniformly dense diamond-silicon carbide composite, comprising consolidating a powder mixture of diamond and amorphous silicon at a pressure and temperature sufficient to produce a uniformly dense diamond-silicon carbide composite having a Vickers hardness of at least 35 GPa, a Knoop hardness of at least 30 GPa, and a fracture toughness of at least 8 MPa·m1/2.
A uniformly dense diamond-silicon carbide composite prepared by a method comprising consolidating a powder mixture of diamond and amorphous silicon at a pressure and temperature sufficient to produce a uniformly dense diamond-silicon carbide composite having a Vickers hardness of at least 35 GPa, a Knoop hardness of at least 30 GPa, and a fracture toughness of at least 8 MPa·m1/2.
A uniformly dense diamond-silicon carbide composite having a Vickers hardness of at least 35 GPa, a Knoop hardness of at least 30 GPa, and a fracture toughness of at least 8 MPa·m1/2.
Dependencies are inferred from the claim text.