Patent ID: 7810588
Filing Date: 2010-10-12
Classification: B22F,C22C,E21B

Abstract:
1. A method of constructing an earth boring diamond-impregnated cutting structure, comprising: (a) coating diamond particles with tungsten, creating coated particles; (b) applying to each of the coated particles an encapsulation layer of a carbide powder having no binder other than a green organic binder, creating encapsulated granules; (c) placing the encapsulated granules with the green organic binder in a matrix binder material in a mold shaped to define a cutting structure; then (d) heating the encapsulated granules and the matrix binder material in the mold at atmospheric pressure for a time and temperature to cause the matrix binder material to melt and infiltrate into the encapsulation layers into contact with the coated particles; then (e) cooling the matrix binder material and the encapsulated granules, causing the matrix binder material to serve as a binder for the carbide powder to solidify and bond the encapsulated granules.