Presintered brazing
The present application describes an article having a first metal component joined to a second metal component by a metallurgic joint of presintered powdered metal interposed between contiguous surfaces of the first metal component and the second metal component. The present application also describes a composition for use in a brazing process comprising a presintered powdered metal. The present application also describes a process for brazing including the following steps: presintering a powdered metal; adding the presintered powdered metal to a first and second metal component; and heating the combination of the first and second metal components containing the presintered powdered metal until the powdered metal melts and joins the metal components to form a metallurgic joint.
1. An article comprising a first metal component adjoined to a second metal component by a metallurgic joint of presintered metal pellet interposed between contiguous surfaces of the first metal component and the second metal component,
wherein the presintered metal pellet comprises a mechanically compacted powdered metal, and
wherein the article comprises a carrier part, the first metal component comprises a spider of the carrier part and the second metal component comprises a flange of the carrier part.
2. The article of claim 1 , wherein the powdered metal is selected from a group consisting of iron, carbon, copper, nickel, molybdenum, chromium, manganese, or a combination of two of more thereof.
3. The article of claim 2 , wherein the powdered metal is manufactured by a copper infiltration process.
4. The article of claim 2 , wherein the powdered metal was presintered in an atmosphere selected from a group consisting of air, hydrogen, nitrogen, helium, methane, endogas, or a combination of two or more thereof.
5. The article of claim 4 , wherein the powdered metal was presintered at a temperature of about 300° F.-1500° F.
6. The article of claim 5 , wherein the powdered metal comprises no lubricants.
7. The article of claim 6 , wherein the powdered metal comprises no fluxing agents.
8. The article of claim 7 , wherein the metallurgic joint is formed by a brazing process.
9. The article of claim 8 , wherein the brazing process occurs in a H 2 —N 2 atmosphere.
10. The article of claim 9 , wherein break strength of the metallurgic joint is at least 35000 kN.
11. The article of claim 9 , wherein break strength of the metallurgic joint is at least 45000 kN.
12. The article of claim 9 , wherein break strength of the metallurgic joint is at least 55000 kN.
13. A composition for use in a brazing process comprising a presintered powdered metal, wherein the presintered powdered metal is selected from a group consisting of iron, carbon, copper, nickel, molybdenum, chromium, manganese, or a combination of two of more thereof,
wherein the powdered metal is manufactured by a copper infiltration process,
wherein the powdered metal is presintered in an atmosphere selected from a group consisting of air, hydrogen, nitrogen, helium, methane, endogas, or a combination of two or more thereof,
wherein the powdered metal is presintered at a temperature of about 300° F.-1500° F.,
wherein the powdered metal comprises amide waxes, metallic stearates, lubricants, and fluxing agents,
wherein the lubricants and the fluxing agents are dissipated by presintering.
14. The composition of claim 13 , wherein the powdered metal is presintered at a temperature of 300° F.-1500° F.
15. The composition of claim 14 , wherein the powdered metal is presintered in an atmosphere selected from a group consisting of air, hydrogen, nitrogen, helium, methane, endogas, or a combination of two or more thereof.
16. A process for brazing comprising:
compacting a powdered metal into a pellet;
presintering the pellet;
adding the presintered pellet to a first and second metal component;
heating the combination of the first and second metal components containing the presintered pellet until the pellet melts and joins the metal components to form a metallurgic joint.