IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0835264
(2004-04-30)
|
등록번호 |
US-8651394
(2014-02-18)
|
우선권정보 |
DE-103 19 481 (2003-04-30) |
발명자
/ 주소 |
- Heïnrich, Peter
- Kreye, Heinrich
- Stoltenhoff, Thorsten
|
출원인 / 주소 |
|
대리인 / 주소 |
Millen, White, Zelano & Branigan, P.C.
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
8 |
초록
▼
The invention relates to a Laval nozzle for thermal spraying and kinetic spraying, especially for cold gas spraying, with a convergent section and a divergent section. To achieve a better degree of application effect, at least a portion of the divergent section, according to the invention, has a bel
The invention relates to a Laval nozzle for thermal spraying and kinetic spraying, especially for cold gas spraying, with a convergent section and a divergent section. To achieve a better degree of application effect, at least a portion of the divergent section, according to the invention, has a bell-shaped contour.
대표청구항
▼
1. A coating method comprising spraying a jet of gas carrying particulate material by cold gas spraying or by high speed flame spraying through an outlet of a Laval nozzle onto a work piece to form a coating thereon, said Laval nozzle comprising a converging section and a diverging section, at a gas
1. A coating method comprising spraying a jet of gas carrying particulate material by cold gas spraying or by high speed flame spraying through an outlet of a Laval nozzle onto a work piece to form a coating thereon, said Laval nozzle comprising a converging section and a diverging section, at a gas temperature of not more than 800° C. and below the melting temperature of the particulate material and through a Laval nozzle that is devoid of abrupt transitions, which would disrupt the uniformity of the gas flow, and wherein the divergent section has a sufficient extent of continuously curving concave walls to provide an increase in the percentage of particles that affix to the work piece compared to the use of a cone-shaped divergent section, and so as to provide a jet at the outlet having a velocity of a Mach number between 2.5 and 5. 2. A method according to claim 1, comprising spraying a jet through the nozzle said jet being substantially parallel to said nozzle. 3. A method according to claim 1, wherein the entire length of the nozzle is between 60 and 300 mm. 4. A method according to claim 1, said nozzle having a nozzle neck cross-section of 3-25 mm2. 5. A method according to claim 1, said nozzle having a nozzle neck and a nozzle outlet, said nozzle having an expansion ratio, the ratio between the cross section of the nozzle neck and the cross-section of the nozzle outlet of between 1 and 25. 6. A method according to claim 1, wherein the gas comprises at least one of nitrogen, air and helium. 7. A method according to claim 1, wherein the temperature of the gas is in the range of 200° to 600° C. 8. A method according to claim 1, wherein the size of the particulate material is 5 to 106 μm. 9. A method according to claim 1, wherein the size of the particulate material is 5 to 25 μm. 10. A method according to claim 1, wherein the size of the particulate material is 10 to 38 μm. 11. A method according to claim 1, wherein the size of the particulate material is 30 to 70 μm. 12. A method according to claim 1, wherein the entire length of the nozzle is between 100 and 200 mm. 13. A method according to claim 1, said nozzle having a nozzle neck cross-section of 5-10 mm2. 14. A method according to claim 1, said nozzle having a nozzle neck and a nozzle outlet, wherein the jet has a velocity at the outlet of a Mach number between 2.5 and 4. 15. A method according to claim 3, said nozzle having a nozzle neck and a nozzle outlet, said nozzle having an expansion ratio, the ratio between the cross section of the nozzle neck and the cross-section of the nozzle outlet of between 1 and 25. 16. A method according to claim 3, which is a method where the gas is sprayed by high speed flame spraying. 17. A method according to claim 1, wherein the particulate material consists essentially of particulate copper and the work piece consists essentially of aluminum. 18. A method according to claim 3, which is a method where the gas is sprayed by cold gas spraying. 19. A method according to claim 1 wherein the converging section is configured conically over the entire length thereof. 20. A method according to claim 1 wherein the ratio of the length of the converging section to the divergent section is on the order of about 2 to 13. 21. A method according to claim 1 wherein the particles pass through the converging section, a neck section and a diverging section wherein the neck section has convex walls, and is shorter, lengthwise, than the convergent section, and the convergent section is shorter, lengthwise, than the divergent section. 22. A method according to claim 1, wherein the divergent section has a sufficient extent of continuously curving concave walls to provide for an about 50 to 65 percentage increase of particles that affix to the work piece compared to the use of a cone-shaped divergent section. 23. A method according to claim 1, wherein the divergent section has a sufficient extent of continuously curving concave walls to provide for an about 75 to 80 percentage increase of particles that affix to the work piece compared to the use of a cone-shaped divergent section. 24. A coating method comprising spraying a jet of gas carrying particulate material by cold gas spraying or by high speed flame spraying through an outlet of a Laval nozzle onto a work piece to form a coating thereon, said Laval nozzle comprising a converging section and a diverging section, at a gas temperature of not more than 800° C. and below the melting temperature of the particulate material and through a Laval nozzle that is devoid of abrupt transitions, which would disrupt the uniformity of the gas flow, and wherein the entire divergent section has continuously curving concave walls, and so as to provide a jet at the outlet having a velocity of a Mach number between 2.5 and 5. 25. A coating method comprising spraying a jet of gas carrying particulate material by cold gas spraying or by high speed flame spraying through an outlet of a Laval nozzle onto a work piece to form a coating thereon, said Laval nozzle comprising a converging section and a diverging section, at a gas temperature of not more than 800° C. and below the melting temperature of the particulate material and through a Laval nozzle that is devoid of abrupt transitions, which would disrupt the uniformity of the gas flow, and wherein the divergent section has through a part thereof, which is less than through its entire length, continuously curving concave walls, and so as to provide a jet at the outlet having a velocity of a Mach number between 2.5 and 5. 26. A method according to claim 25, wherein about one third or one half of the length of the divergent section has continuously curving concave walls, and a remaining part of the length of the divergent section has a cone or cylinder shape. 27. A coating method comprising spraying a jet of gas carrying particulate material by cold gas spraying or by high speed flame spraying through an outlet of a Laval nozzle onto a work piece to form a coating thereon, said Laval nozzle comprising a converging section, a neck section, and a diverging section, at a gas temperature of not more than 800° C. and below the melting temperature of the particulate material and through a Laval nozzle that is devoid of abrupt transitions, which would disrupt the uniformity of the gas flow, wherein the neck section has a length and convex walls, and wherein the divergent section has through a part thereof or through its entire length continuously curving concave walls, and so as to provide a jet at the outlet having a velocity of a Mach number between 2.5 and 5.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.