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Preparation of bulk superhard B-C-N nanocomposite compact

Patent ·
OSTI ID:1018338
 [1];  [2]
  1. Los Alamos, NM
  2. Sichuan, CN
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Bulk, superhard, B--C--N nanocomposite compacts were prepared by ball milling a mixture of graphite and hexagonal boron nitride, encapsulating the ball-milled mixture at a pressure in a range of from about 15 GPa to about 25 GPa, and sintering the pressurized encapsulated ball-milled mixture at a temperature in a range of from about 1800-2500 K. The product bulk, superhard, nanocomposite compacts were well sintered compacts with nanocrystalline grains of at least one high-pressure phase of B--C--N surrounded by amorphous diamond-like carbon grain boundaries. The bulk compacts had a measured Vicker's hardness in a range of from about 41 GPa to about 68 GPa.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
W-7405-ENG-36
Assignee:
Los Alamos National Security, LLC (Los Alamos, MN)
Patent Number(s):
7,938,997
Application Number:
11/529,657
OSTI ID:
1018338
Country of Publication:
United States
Language:
English

References (6)

High-pressure synthesis, characterization, and equation of state of cubic C-BN solid solutions journal May 1995
Structure and phase characteristics of amorphous boron–carbon–nitrogen under high pressure and high temperature journal April 2001
Sintering of cubic boron nitride without additives at 7.7 GPa and above 2000 °C journal January 1999
Synthesis of superhard cubic BC2N journal March 2001
Creation of superhard B–C–N heterodiamond using an advanced shock wave compression technology journal January 1999
Formation of cubic C-BN by crystallization of nano-amorphous solid at atmosphere journal July 1998

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36 MATERIALS SCIENCE