Methods For Making An Attack Tool
In one aspect of the invention, an attack tool is disclosed which has a wear-resistant base suitable for attachment to a driving mechanism, a first cemented metal carbide segment brazed to the base at a first interface, and a second metal carbide segment brazed to the first carbide segment at a second interface opposite the base.
1 .- 14 . (canceled)
15 . A method of making an attack tool:
disposing a first braze material having a first melting temperature at a first interface between a first carbide segment and a base;
disposing a second braze material having a second melting temperature at a second interface between said first carbide segment and a second carbide segment, said second carbide segment having a diamond-based material bonded thereto;
heating at least one of said first braze material to at least said first melting temperature and said second braze material to at least said second melting temperature;
cooling at least one of said diamond-based material and said second carbide segment during said heating.
16 . The method of claim 15 , wherein said heating of said first braze material and said second braze material occurs simultaneously.
17 . The method of claim 16 , wherein said first melting temperature and said second melting temperature are the same.
18 . The method of claim 15 , wherein said cooling occurs during said heating.
19 . The method of claim 18 , wherein said cooling occurs with a liquid.
20 . The method of claim 19 , further comprises providing an inert atmosphere under which said heating occurs and wherein said liquid comprises said inert atmosphere.
21 . The method of claim 15 , further comprising applying a force to align said first carbide segment, said second carbide segment, and said diamond-based material.
22 . A method of making an attack tool:
positioning a first braze material having a first melting temperature at a first interface between a first carbide segment and a base;
positioning a second braze material having a second melting temperature at a second interface between said first carbide segment and a second carbide segment, said second carbide segment having a bond to a diamond-based material;
heating at least one of said first braze material to at least said first melting temperature and said second braze material to at least said second melting temperature;
reducing a residual stress caused by said heating in said bond.
23 . The method of claim 21 , wherein said reducing a residual stress further comprises cooling at least one of said diamond-based material and said second carbide segment during said heating.
24 . The method of claim 22 , wherein said cooling occurs during said heating.
25 . The method of claim 23 , wherein said cooling occurs with a liquid.
26 . The method of claim 24 , further comprises providing an inert atmosphere under which said heating occurs and wherein said liquid comprises said inert atmosphere.
27 . The method of claim 21 , wherein said heating of said first braze material and said second braze material occurs simultaneously.
28 . The method of claim 26 , wherein said first melting temperature and said second melting temperature are the same.
29 . The method of claim 22 , further comprising applying a force to align said first carbide segment, said second carbide segment, and said diamond-based material.
30 . A method of making an attack tool:
heating a braze material disposed between a carbide segment and another carbide segment a braze material having a melting temperature to at least a melting temperature of said braze material, said carbide segment including a superhard material bonded thereto;
cooling at least one of said superhard material and said carbide segment.
31 . The method of claim 28 , wherein said cooling occurs during said heating.
32 . The method of claim 29 , wherein said cooling occurs with a liquid.
33 . The method of claim 30 , further comprises providing an inert atmosphere under which said heating occurs and wherein said liquid comprises said inert atmosphere.
34 . The method of claim 28 , wherein said superhard material is a diamond-based material.