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Title: Novel hard compositions and methods of preparation

Abstract

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. 3 figs.

Inventors:
Publication Date:
OSTI Identifier:
7256860
Patent Number(s):
US 4400213; A
Application Number:
PPN: US 6-231085
Assignee:
PTO; EDB-94-124280
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Resource Relation:
Patent File Date: 3 Feb 1981
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBIDES; FABRICATION; HARDNESS; CHEMICAL COMPOSITION; FRACTURE PROPERTIES; CARBON COMPOUNDS; MECHANICAL PROPERTIES; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication; 360203 - Ceramics, Cermets, & Refractories- Mechanical Properties

Citation Formats

Sheinberg, H. Novel hard compositions and methods of preparation. United States: N. p., 1983. Web.
Sheinberg, H. Novel hard compositions and methods of preparation. United States.
Sheinberg, H. Tue . "Novel hard compositions and methods of preparation". United States. doi:.
@article{osti_7256860,
title = {Novel hard compositions and methods of preparation},
author = {Sheinberg, H.},
abstractNote = {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. 3 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 23 00:00:00 EDT 1983},
month = {Tue Aug 23 00:00:00 EDT 1983}
}