Brazed diamond tools and methods for making the same
View Patent ↗Superabrasive tools and methods for the making thereof are disclosed and described. In one aspect, superabrasive particles are chemically bonded to a matrix support material according to a predetermined pattern by a braze alloy. The brazing alloy may be provided as a powder, thin sheet, or sheet of amorphous alloy. A template having a plurality of apertures arranged in a predetermined pattern may be used to place the superabrasive particles on a given substrate or matrix support material.
1. A method of making a superabrasive tool, comprising the steps of:
a) providing a substrate;
b) providing a template having a plurality of apertures corresponding to a predetermined pattern;
c) placing the template on a transfer sheet;
d) filling the apertures with a plurality of superabrasive particles;
e) removing the template, such that the superabrasive particles remain in place on the transfer sheet in accordance with the predetermined pattern of the template;
f) affixing the plurality of superabrasive particles in the predetermined pattern on an exposed surface of the substrate by transferring the superabrasive particles to the exposed surface of the substrate using the transfer sheet, such that the superabrasive particles become affixed to the exposed surface of the substrate in accordance with the predetermined pattern; and
g) brazing the plurality of superabrasive particles directly to the exposed surface of the substrate in accordance with the predetermined pattern using a brazing alloy by applying the brazing alloy to the substrate and the superabrasive particles, the brazing alloy being provided as a sheet of amorphous braze, wherein the brazing alloy includes a material selected from the group consisting of titanium, vanadium, chromium, zirconium, molybdenum, tungsten, manganese, iron, silicon, aluminum and mixtures or alloys thereof.
2. The method of claim 1 , wherein the brazing alloy includes between about 2% and about 50% by weight of a material selected from the group consisting of chromium, manganese, titanium, silicon and aluminum.
3. The method of claim 2 , wherein the material is chromium.
4. The method of claim 1 , wherein
the sheet of amorphous braze alloy is applied on the superabrasive particles, such that the superabrasive particles are positioned between the sheet of amorphous braze and the exposed surface.
5. The method of claim 1 , wherein the transfer sheet is
the sheet of amorphous braze alloy; and
the sheet of amorphous braze alloy having superabrasive particles affixed thereto is applied on the exposed surface of the substrate, such that the superabrasive particles are disposed between the sheet of amorphous braze and the exposed surface.
6. The method of claim 1 , wherein prior to the step of affixing, the method further comprises the step of
placing the sheet of amorphous braze upon the exposed surface of the substrate
such that the sheet of amorphous braze is disposed between the superabrasive particles and the exposed surface.
7. The method of claim 1 or 6 , wherein the superabrasive particles are affixed to the sheet of amorphous braze or substrate using an adhesive.
8. The method of claim 1 , wherein the step of brazing includes heating the brazing alloy and substrate to a temperature of less than about 1,100° C. which is sufficient to braze the superabrasive particles directly to the substrate.
9. The method of claim 1 , wherein each aperture is configured to hold one superabrasive particle.
10. The method of claim 9 , wherein some of the apertures are larger than other apertures.
11. The method of claim 1 , wherein the superabrasive particles are affixed to the exposed surface of the substrate by applying an adhesive to the exposed surface prior to affixing the plurality of superabrasive particles thereto with the transfer sheet, wherein the adhesive on the substrate is stronger than forces holding the superabrasive particles in place on the transfer sheet.