Granted Patent B2

US 7,543,764 · App. 10/401,427 · Granted Jun 9, 2009

Abstract

Claims (16)

1. A nozzle for use in a cold spray technique comprising:

a passageway for spraying a powder material, said passageway having a converging section and a diverging section, and

said diverging section being formed from polybenzimidazole.

2. A nozzle according to claim 1 , wherein both said converging section and said diverging section are formed from polybenzimidazole.

3. A cold spray system comprising:

a source of powdered material;

means for mixing said powder material with a gas;

a nozzle having a passageway communicating with said mixing means for spraying said powder material onto a workpiece;

said nozzle having a converging section followed by a diverging section; and

said diverging section being formed from polybenzimidazole.

4. A system according to claim 3 , wherein said converging section is also formed from polybenzimidazole.

5. A system according to claim 3 , wherein said nozzle is a single nozzle structure.

6. A system according to claim 3 , further comprising said nozzle having a smaller dimension at an edge and a supersonic portion having a length and the ratio of said smaller dimension to said length is in the range of from 0.01 to 0.04.

7. A system according to claim 3 , wherein only said diverging section is formed from said polybenzimidazole.

8. A nozzle according to claim 1 , further comprising said nozzle having a smaller dimension at an edge and a supersonic portion having a length and the ratio of said smaller dimension to said length is in the range of from 0.01 to 0.04.

9. A nozzle according to claim 1 , wherein only said diverging section is formed from said polybenzimidazole.

Assignments (6)