Process and device for high-speed flame spraying
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C23C-004/12
B05C-005/04
출원번호
US-0442185
(2003-05-21)
우선권정보
DE-0022660 (2002-05-22)
발명자
/ 주소
Heinrich, Peter
Kreye, Heinrich
Stoltenhoff, Thorsten
출원인 / 주소
Linde AG
대리인 / 주소
Millen, White, Zelano &
인용정보
피인용 횟수 :
19인용 특허 :
2
초록▼
The invention relates to a process and a device for high-velocity flame spraying, the spray particles being accelerated in a flame jet of combustion gases. The injection of spray particles according to the invention takes place axially and centrally in the divergent section of the Laval nozzle, the
The invention relates to a process and a device for high-velocity flame spraying, the spray particles being accelerated in a flame jet of combustion gases. The injection of spray particles according to the invention takes place axially and centrally in the divergent section of the Laval nozzle, the powder tube (2) and the outer nozzle body (1) together forming a Laval nozzle for acceleration of the flame jet.
대표청구항▼
1. In a process comprising flame spraying particulate material in a spray direction through a nozzle exit, wherein powdered particles are injected into a flame jet of combustion gases, and the particles are brought to speeds of up to about 800 m/s when the combustion gases are passed through a Laval
1. In a process comprising flame spraying particulate material in a spray direction through a nozzle exit, wherein powdered particles are injected into a flame jet of combustion gases, and the particles are brought to speeds of up to about 800 m/s when the combustion gases are passed through a Laval nozzle, said Laval nozzle comprising an outer nozzle body, a nozzle throat, a nozzle exit, a convergent zone and a divergent zone, the improvement comprising injecting the powdered particles axially and centrally in the divergent zone of the Laval nozzle.2. A process according to claim 1, wherein the powdered particles are injected by a powder tube oriented in the spray direction and located in the outer nozzle body, the powder tube having an outer contour in combination with an inner contour of the outer nozzle body which forms the Laval nozzle.3. A process according to claim 1, wherein injection of the powdered particles takes place at a site located between one-fourth and one-half the length of a zone having its starting point fixed by the nozzle throat and its end point by the nozzle exit, measurements being taken length-wise from the nozzle throat.4. A process according to claim 2, wherein the passage for the flame jet at a junction between the convergent zone and the divergent zone has a circular ring-shaped cross-section bordered to the inside by the outer contour of the powder tube and to the outside by the inner contour of the outer nozzle body.5. A process for flame spraying particulate material in a Laval nozzle, comprising:injecting particles into a flame jet of combustion gases axially and centrally in a divergent zone of the Laval nozzle, wherein the particles are brought up to speeds of about 800 m/s when passing the combustion gases through the Laval nozzle.6. A high-velocity flame spraying device comprising a combustion chamber and a Laval nozzle comprising an outer nozzle body (1), within said outer body a converging section connected through a nozzle throat to a diverging section, having a nozzle exit and a powder tube (2), the powder tube providing for supply of spray particles within the outer nozzle body, wherein the powder tube ends within the outer nozzle body axially and centrally in the divergent section of the Laval nozzle, said Laval nozzle being in communication with an outlet from said combustion chamber.7. A high-velocity flame spraying device according to claim 6, wherein an inner shape of the outer nozzle body, which together with an outer shape of the powder tube oriented in the spray direction and located coaxially in the outer nozzle body, forms the Laval nozzle.8. A high-velocity flame spraying device according to claim 6, wherein the powder tube located inside has a contour on its outerside, which together with a smooth, cylindrical inside contour of the outer nozzle body, forms the Laval nozzle.9. A high-velocity flame spraying device according to claim 6, wherein the powder tube located inside has a smooth cylindrical outer side and the outer nozzle body is shaped on its inside so as to form the Laval nozzle.10. A high-velocity flame spraying device according to claim 6, wherein contours required for the Laval nozzle are partially on the outer side of the powder tube and partially on an inner side of the outer nozzle body.11. A high-velocity flame spraying device according to claim 6, wherein the ratio of the cross-sectional area for gas passage at the connection between the converging and diverging section to the cross-section at the nozzle exit is from about 1:2?about 1:25.12. A process according to claim 11, wherein said ratio is between 1:5 and 1:11.13. A high-velocity flame spraying device according to claim 6, wherein the outer nozzle body in the convergent zone has a circular ring-shaped cross-section and the outer nozzle body at the throat or in the divergent zone has a rectangular cross-section.14. A high-velocity flame spraying device according to claim 6, wherein the powder tube and also the outer nozzle body each comprises a metallic material, a ceramic, or a composite material with metallic or ceramic components.15. A high-velocity flame spraying device according to claim 6, wherein the powder tube and the outer nozzle body are comprised of different materials.16. A high-velocity flame spraying device according to claim 6, wherein the powder tube and/or the outer nozzle body comprises, in the direction of flow, two or more parts, in which the first part encompasses the area around a nozzle throat and the second part adjoins the first part and extends to a nozzle exit, the second part being easily interchangeable.17. A high-velocity flame spraying device according to claim 16, wherein the two parts comprise different materials.
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