Abrasive tool making process – material – or composition – Impregnating or coating an abrasive tool
Patent
1989-07-11
1991-04-30
Dixon, Jr., William R.
Abrasive tool making process, material, or composition
Impregnating or coating an abrasive tool
51293, 51308, 51309, B24D 1100
Patent
active
050115146
ABSTRACT:
Superabrasive cutting elements, backed compacts and methods for their manufacture are disclosed wherein metal coated superabrasive particles are cemented under HPHT conditions. The superabrasives bond to the metal of the coating and the metal coatings of adjacent particles bond to each other forming a matrix. A binding aid with thermal expansion characteristics close to that of the superabrasive particle can be infiltrated through or otherwise mixed with the particles to assist in the bonding between the metal coatings and to fill in voids. Catalyst and non-catalyst binding aids can also be used. Uncoated, smaller superabrasive particles can be interstitially dispersed among the coated particles to increase the superabrasive concentration and can self bond to form a cemented/sintered structure. Tungsten is a preferred metal coating and silicon is a preferred binding/sintering aid. The superabrasive can be diamond, cubic boron nitride, boron doped diamond or crushed sintered polycrystalline aggregates. The free-standing cutting element can have a brazeable layer and the compact can be backed with, for example, cemented tungsten carbide. Free-standing cutting elements can be thermally stable up to 1,200.degree. C. Backed compacts can be thermally stable up to 1,100.degree. C.
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Chen Sy-Hwa
Cho Hyun S.
Csillag Frank
Merrill Leo
Sung Chien-Min
Dixon Jr. William R.
Norton Company
Thompson Willie J.
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