Methods and compositions for brazing

1. A method, comprising:

disposing a braze material between a cutting element pocket of a bit body and a cutting element to be disposed in the cutting element pocket, wherein the braze material comprises a first composition having a first melting point and a second composition having a second melting point lower than the first melting point;

heating the braze material and forming a transient liquid phase;

transforming the transient liquid phase to a solid phase having a melting point higher than the second melting point, wherein the solid phase comprises copper, silver, zinc, magnesium, and at least one material selected from the group consisting of nickel, tin, cobalt, iron, phosphorous, indium, lead, antimony, cadmium, and bismuth, and wherein the solid phase comprises about 25% to about 35% zinc by weight; and

bonding the cutting element pocket of the bit body to the cutting element with the solid phase.

2. The method of claim 1 , wherein disposing a braze material between a cutting element pocket of a bit body and a cutting element to be disposed in the cutting element pocket comprises disposing a braze material comprising at least one intermetallic compound between the cutting element pocket of the bit body and the cutting element to be disposed in the cutting element pocket.

3. The method of claim 1 , wherein disposing a braze material between a cutting element pocket of a bit body and a cutting element to be disposed in the cutting element pocket comprises disposing a braze material comprising a plurality of particles between the cutting element pocket of the bit body and the cutting element to be disposed in the cutting element pocket.

4. The method of claim 3 , wherein disposing a braze material comprising a plurality of particles between a cutting element pocket of a bit body and a cutting element to be disposed in the cutting element pocket comprises disposing a braze material comprising a plurality of particles having an average particle size in a range from about 1 μm to about 15 μm between the cutting element pocket of the bit body and the cutting element to be disposed in the cutting element pocket.

5. The method of claim 1 , wherein disposing a braze material between a cutting element pocket of a bit body and a cutting element to be disposed in the cutting element pocket comprises disposing a paste comprising at least one of the first composition or the second composition between the cutting element pocket of the bit body and the cutting element to be disposed in the cutting element pocket.

6. The method of claim 1 , wherein disposing a braze material between a cutting element pocket of a bit body and a cutting element to be disposed in the cutting element pocket comprises disposing a foil comprising at least one of the first composition or the second composition between the cutting element pocket of the bit body and the cutting element to be disposed in the cutting element pocket.

7. The method of claim 1 , wherein heating the braze material and forming a transient liquid phase comprises heating the braze material to a temperature in a range extending from about 200° C. to about 600° C.

8. The method of claim 1 , further comprising, after the bonded cutting element pocket of the bit body and cutting element are used in an application, heating the solid phase to weaken the bond between the cutting element pocket of the bit body and the cutting element.

9. The method of claim 8 , wherein heating the solid phase to weaken the bond between the cutting element pocket of the bit body and the cutting element comprises heating the solidified braze material to a temperature in a range extending from about 600° C. to about 800° C.

10. The method of claim 8 , further comprising separating the cutting element from the cutting element pocket of the bit body.

11. The method of claim 1 , wherein disposing a braze material between a cutting element of a bit body and a cutting element to be disposed in the cutting element pocket comprises after forming a joint between the cutting element of the bit body and the cutting element, disposing the braze material as a filler adjacent the previously formed joint between the cutting element pocket of the bit body and the cutting element.

12. The method of claim 1 , wherein heating the braze material and forming a transient liquid phase comprises heating the braze material for at least about four hours.

13. The method of claim 1 , wherein heating the braze material and forming a transient liquid phase comprises heating the braze material in an inert atmosphere.

14. A method, comprising:

disposing a braze material adjacent and between a polycrystalline diamond material and

a supporting substrate, wherein the braze material comprises a first composition having a first melting point and a second composition having a second melting point lower than the first melting point;

heating the braze material and forming a transient liquid phase;

transforming the transient liquid phase to a solid phase having a melting point higher than the second melting point, wherein the solid phase comprises copper, silver, zinc, magnesium, and at least one material selected from the group consisting of nickel, tin, cobalt, iron, phosphorous, indium, lead, antimony, cadmium, and bismuth, and wherein the solid phase comprises about 25% to about 35% zinc by weight; and

bonding the polycrystalline diamond material to the substrate with the solid phase.

15. The method of claim 14 , wherein disposing a braze material adjacent and between a polycrystalline diamond material and a supporting substrate comprises disposing a braze material comprising at least one intermetallic compound adjacent and between the polycrystalline diamond material and the supporting substrate.

16. The method of claim 14 , wherein disposing a braze material adjacent and between a polycrystalline diamond material and a supporting substrate comprises disposing a braze material comprising a plurality of particles adjacent and between the polycrystalline diamond material and the supporting substrate.

17. The method of claim 16 , where disposing a braze material comprising a plurality of particles adjacent and between a polycrystalline diamond material and a supporting substrate comprises disposing a braze material comprising a plurality of particles having an average particle size in a range from about 1 μm to about 15 μm adjacent and between the polycrystalline diamond material and the supporting substrate.

18. The method of claim 14 , wherein heating the braze material and forming a transient liquid phase comprises heating the braze material to a temperature in a range extending from about 200° C. to about 600° C.

19. A method, comprising:

disposing a barrier material over at least a portion of at least one body selected from the group consisting of a cutting element pocket of a bit body and a cutting element to be disposed in the cutting element pocket;

disposing a braze material between the cutting element pocket of the bit body and the cutting element to be disposed in the cutting element pocket, wherein the braze material comprises a first composition having a first melting point and a second composition having a second melting point lower than the first melting point;

heating the braze material and forming a transient liquid phase;

transforming the transient liquid phase to a solid phase having a melting point higher than the second melting point, wherein the solid phase comprises copper, silver, zinc, magnesium, and at least one material selected from the group consisting of nickel, tin, cobalt, iron, phosphorous, indium, lead, antimony, cadmium, and bismuth, and wherein the solid phase comprises about 25% to about 35% zinc by weight; and

bonding the cutting element pocket of the bit body to the cutting element with the solid phase.

20. The method of claim 19 , further comprising selecting the barrier material to comprise a carbide coating.

21. The method of claim 1 , wherein the braze material comprises from 51% to 60% silver by weight.

22. The method of claim 1 , wherein the braze material comprises from 5% to 18% copper by weight.

23. The method of claim 1 , wherein the braze material comprises from 28% to about 35% zinc by weight.