US5035771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating diamond grains
Assignee: Saint Gobain Diamantwerkzeuge GmbH and Co KG
•
Filing: 1987-07-30
•
Granted: 1991-07-30
•
Expires: 2007-07-30
Abstract
Abstract Diamond grains utilized in cutting tools and usually held in a bond, specifically metallic bond are subjected to a pretreatment which enlarges their surface to at least twice their natural surface area. The pretreatment includes embedding the diamond grains in a metal powder, and exposing the embedded grains to a stream of hydrogen or hydrogen-containing gas at a temperature above 700° C. until pores are etched in contact areas of the diamonds with the metal particles. The pretreated diamond grains are then purified with an acid to remove the metal particles and other residues.
Inventors
- 👤 Dietrich Borse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:21
CPC Classifications
B; B24; B24D; B24D18/00; C; C04; C04B; C04B41/00; C04B41/53; C04B41/80; C04B41/91
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
127 words
A method of roughening surfaces of diamond grains, comprising the steps of embedding the diamond grains in a metal powder having a particle size less than 20 μm and of a material selected from a group consisting of iron, cobalt, nickel, a mixture thereof, and alloys thereof; exposing the embedded diamond grains to a stream of one of hydrogen and hydrogen-containing gas at a temperature above 700° C. until pores are etched in surface areas of the diamond grains which are in contact with particles of the metal powder, the diamond grains being exposed to said stream until their surface areas are at least twice as large as a size of their original surface areas; and removing the metal powder and other residuals from etched diamond grains.
Claim 2
Independent Claim
127 words
A method of roughening surfaces of diamond grains, comprising the steps of embedding the diamond grains in a metal powder having a particle size less than 20 μm and of a material selected from a group consisting of iron, cobalt, nickel, a mixture thereof, and alloys thereof; exposing the embedded diamond grains to a stream of one of hydrogen and hydrogen-containing gas at a temperature above 700° C. until pores are etched in surface areas of the diamond grains which are in contact with particles of the metal powder, the diamond grains being exposed to said stream until their surface areas are at least twice as large as a size of their original surface areas; and removing the metal powder and other residuals from etched diamond grains.
Claim 3
Dependent Claim
23 words
A method as defined in claim 1, wherein said exposing step includes exposing the diamond grains to a reaction temperature of 700°-900° C.
Claim 4
Dependent Claim
29 words
A method as defined in claim 2, wherein said embedding step includes embedding the diamond grains in a powder material having a particle size between 0.5 and 5 μm.
Claim 5
Dependent Claim
23 words
A method as defined in claim 1, wherein said removing step comprises the step of cleaning the etched diamond grains with an acid.
Claim 6
Dependent Claim
131 words
A diamond tool, comprising at least one diamond grain having a surface portion roughened by embedding the diamond grain in a metal powder having a particle size less than 20 μm and of a material selected from a group consisting of iron, cobalt, nickel, a mixture thereof, and alloys thereof; exposing the embedded diamond grain to a stream of one of hydrogen and hydrogen-containing gas at a temperature above 700° C. until pores are etched in surface areas of the diamond grain which are in contact with particles of the metal powder, said diamond grain being exposed to the stream until its surface areas are at least twice as large as a size of its original surface areas; and removing the metal powder and other residuals from the etched diamond grains.
Claim 7
Dependent Claim
131 words
A diamond tool, comprising at least one diamond grain having a surface portion roughened by embedding the diamond grain in a metal powder having a particle size less than 20 μm and of a material selected from a group consisting of iron, cobalt, nickel, a mixture thereof, and alloys thereof; exposing the embedded diamond grain to a stream of one of hydrogen and hydrogen-containing gas at a temperature above 700° C. until pores are etched in surface areas of the diamond grain which are in contact with particles of the metal powder, said diamond grain being exposed to the stream until its surface areas are at least twice as large as a size of its original surface areas; and removing the metal powder and other residuals from the etched diamond grains.
Claim 8
Dependent Claim
19 words
A diamond tool as defined in claim 5, wherein said roughened surface portion is anchored in a bonding material.
Claim 9
Dependent Claim
25 words
A diamond tool as defined in claim 6 wherein said bonding material is a metal applied on said roughened surface portion by an electroplating process.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |