Novel hard compositions and methods of preparation

Patent · Tue Aug 23 00:00:00 EDT 1983

OSTI ID:864677

Sheinberg, Haskell ^[1]

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1. Los Alamos, NM

Novel very hard compositions of matter are prepared by using in all embodiments only a minor amount of a particular carbide (or materials which can form the carbide in situ when subjected to heat and pressure); and no strategic cobalt is needed. Under a particular range of conditions, densified compositions of matter of the invention are prepared having hardnesses on the Rockwell A test substantially equal to the hardness of pure tungsten carbide and to two of the hardest commercial cobalt-bonded tungsten carbides. Alternately, other compositions of the invention which have slightly lower hardnesses than those described above in one embodiment also possess the advantage of requiring no tungsten and in another embodiment possess the advantage of having a good fracture toughness value. Photomicrographs show that the shapes of the grains of the alloy mixture with which the minor amount of carbide (or carbide-formers) is mixed are radically altered from large, rounded to small, very angular by the addition of the carbide. Superiority of one of these hard compositions of matter over cobalt-bonded tungsten carbide for ultra-high pressure anvil applications was demonstrated.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• DOE Contract Number: W-7405-ENG-36
• Assignee: Sheinberg, Haskell (Los Alamos, NM)
• Patent Number(s): US 4400213
• Application Number: 06/231,085
• OSTI ID: 864677
• Country of Publication: United States
• Language: English

Related Subjects

novel
hard
compositions
methods
preparation
matter
prepared
embodiments
minor
amount
particular
carbide
materials
form
situ
subjected
heat
pressure
strategic
cobalt
range
conditions
densified
hardnesses
rockwell
substantially
equal
hardness
pure
tungsten
hardest
commercial
cobalt-bonded
carbides
alternately
slightly
described
embodiment
possess
advantage
requiring
fracture
toughness
value
photomicrographs
shapes
grains
alloy
mixture
carbide-formers
mixed
radically
altered
rounded
angular
addition
superiority
ultra-high
anvil
applications
demonstrated
tungsten carbide
fracture toughness
minor amount
substantially equal
hard compositions
/75/419/