System for metal atomisation and method for atomising metal powder
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B22F-009/08
B22D-041/22
B22D-041/14
B22F-009/00
출원번호
US-0382033
(2013-02-22)
등록번호
US-9707621
(2017-07-18)
우선권정보
SE-1250187 (2012-02-29)
국제출원번호
PCT/SE2013/050156
(2013-02-22)
국제공개번호
WO2013/129996
(2013-09-06)
발명자
/ 주소
Vikner, Peter
Lönnberg, Patrik
출원인 / 주소
Erasteel Klister AB
대리인 / 주소
Dilworth & Barrese, LLP
인용정보
피인용 횟수 :
0인용 특허 :
11
초록▼
A system for metal powder atomization comprising a refractory lined melting furnace (1) configured to melt metal into a liquid metal bath (6), in which furnace (1) a drain (3) is arranged for draining liquid metal from the bottom of the furnace. The drain (3) is configured to be closed by a stopping
A system for metal powder atomization comprising a refractory lined melting furnace (1) configured to melt metal into a liquid metal bath (6), in which furnace (1) a drain (3) is arranged for draining liquid metal from the bottom of the furnace. The drain (3) is configured to be closed by a stopping member. The system comprises an atomization chamber (2) configured to receive and atomize liquid metal from the melting furnace (1). The system also comprises removal means controllable from the bottom region of the furnace (1) for removing the stopping member without interfering with the surface of the liquid metal bath (6). The removal means and the stopping member are configured such that the stopping member is removable independently of the temperature of the liquid metal bath (6) using the removal means.
대표청구항▼
1. A metal powder atomisation system, comprising a refractory lined melting furnace (1) configured to melt metal into a liquid metal bath (6), in which furnace (1) a drain (3) is arranged for draining liquid metal from the bottom of the furnace (1), the drain (3) being configured to be closed by a s
1. A metal powder atomisation system, comprising a refractory lined melting furnace (1) configured to melt metal into a liquid metal bath (6), in which furnace (1) a drain (3) is arranged for draining liquid metal from the bottom of the furnace (1), the drain (3) being configured to be closed by a stopping member positioned in the drain and underneath the furnace (1),an atomisation chamber (2) configured to receive and atomise liquid metal from the melting furnace (1),a nozzle (4) situated at an end of or underneath the drain 3 and underneath the stopping member and positioned for introducing the liquid metal into the atomisation chamber (2), andremoval means for removing the stopping member, which removal means is controllable from the bottom region of the furnace (1) to enable removal of the stopping member without interfering with the surface of the liquid metal bath (6), whereinthe removal means and the stopping member are configured such that the stopping member is removable independently of the temperature of the liquid metal bath (6) using the removal means, andthe stopping member is a plug (512, 612) created by gas supplied from a hose (514, 614), a solid plug (312, 712, 812), or a sand plug (412) and the removal means are arranged to remove the stopping member mechanically without use of heat from the liquid metal bath (6). 2. A metal powder atomisation system according to claim 1, further comprising a tundish (7) and/or a ladle, the tundish and/or ladle being configured to receive liquid metal drained from the furnace (1) and transfer it to the atomisation chamber (2). 3. A metal powder atomisation system according to claim 2, wherein the tundish (7) and/or ladle comprises heating means (8) for heating the liquid metal. 4. A metal powder atomisation system according to claim 1, wherein the stopping member is consumable upon removal from the drain (3). 5. A metal powder atomisation system according to claim 1, wherein the removal means comprise a slide gate (413, 613). 6. A metal powder atomisation system according to claim 1, wherein the furnace (1) is a refractory lined induction furnace. 7. A metal powder atomisation system according to claim 1, wherein the furnace (1) has a capacity to melt, in one batch, at least 500 kg of metal. 8. A metal powder atomisation system according to claim 7, wherein the furnace (1) has a capacity to melt, in one batch, at least 1000 kg of metal. 9. A metal powder atomisation system according to claim 8, wherein the furnace (1) has a capacity to melt, in one batch, at least 5000 kg of metal. 10. A metal powder atomisation system according to claim 1, wherein the furnace (1) is adapted for receiving and melting scrap metal. 11. A metal powder atomisation system according to claim 1, further comprising protection means (5, 10, 11) for protecting the surface of the liquid metal bath (6) from contact with air. 12. A metal powder atomisation system according to claim 11, wherein the protection means comprise one of: an inert gas, vacuum, or slag (10) covering the surface of the liquid metal bath (6). 13. A metal powder atomisation system according to claim 1, additionally comprising a tundish (7) situated underneath the drain (3) and configured to receive the liquid metal from the furnace (1),a casting shroud (9) extending from the drain (3) into the tundish (7) and arranged to protect the liquid metal from contact with the atmosphere during transfer into the tundish (7),an electrode (8) arranged to heat the liquid metal contained in the tundish (7), andslag (10) positioned in the tundish (7) and above an outlet of the casting shroud (9) to protect a surface of the liquid metal from the surrounding atmosphere,and with the nozzle (4) arranged in a bottom region of the tundish (7) and opening into the atomisation chamber (2). 14. A method of atomising metal powder in a system according to claim 1, comprising the steps of melting metal in the furnace (1),draining the liquid metal from the bottom of the furnace (1) through the drain (3), andatomising the liquid metal in an atomisation chamber (2), wherein the draining is carried out by removing the stopping member by acting thereupon from the bottom region of the furnace (1) using the removal means in such a way that interference with the surface of the liquid metal bath (6) is avoided. 15. Method according to claim 14, wherein the liquid metal is atomised using gas atomisation. 16. A metal powder atomisation system, comprising a refractory lined melting furnace (1) configured to melt metal into a liquid metal bath (6), in which furnace (1) a drain (3) is arranged for draining liquid metal from the bottom of the furnace (1), the drain (3) being configured to be closed by a stopping member positioned in the drain (3) and underneath the furnace (1),an atomisation chamber (2) configured to receive and atomise liquid metal from the melting furnace (1),a nozzle (4) situated at an end of or underneath the drain (3) and underneath the stopping member and positioned for introducing the liquid metal into the atomisation chamber (2), andremoval means for removing the stopping member, which removal means is controllable from the bottom region of the furnace (1) to enable removal of the stopping member without interfering with the surface of the liquid metal bath (6), whereinthe removal means and the stopping member are configured such that the stopping member is removable independently of the temperature of the liquid metal bath (6) using the removal means, andthe stopping member is a metallic solid plug (312) and the removal means are arranged to remove the solid plug (312) by melting with heat (313) resulting from external heating from a burner, a lance (813), resistance or induction heating. 17. A metal powder atomisation system according to claim 16, additionally comprising a tundish (7) situated underneath the drain (3) and configured to receive the liquid metal from the furnace (1),a casting shroud (9) extending from the drain (3) into the tundish (7) and arranged to protect the liquid metal from contact with the atmosphere during transfer into the tundish (7),an electrode (8) arranged to heat the liquid metal contained in the tundish (7), andslag (10) positioned in the tundish (7) and above an outlet of the casting shroud (9) to protect a surface of the liquid metal from the surrounding atmosphere,and with the nozzle (4) arranged in a bottom region of the tundish (7) and opening into the atomisation chamber (2).
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이 특허에 인용된 특허 (11)
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Freytag Friedrich-Carl (Munich DEX) Gediga Josef (Bruchkbel DEX) Ruthardt Rolf (Hanau am Main DEX) Wagner Wolfgang (Neuberg DEX), Method of and device for controlling the pouring of a melt.
McCallum R. William (Ames IA) Dennis Kevin W. (Ames IA) Lograsso Barbara K. (Ames IA) Anderson Iver E. (Ames IA), Method of making bonded or sintered permanent magnets.
Verhoeven John D. (Ames IA) Gibson Edwin D. (Ames IA) Schmidt Frederick A. (Ames IA) Spitzig William A. (Ames IA), Method of preparing copper-dendritic composite alloys for mechanical reduction.
Matthew Besser ; Robert L. Terpstra ; Daniel J. Sordelet ; Iver E. Anderson ; Alan D. Hartman ; Edward R. Argetsinger ; Jeffrey S. Hansen ; Jack I. Paige ; Paul C. Turner, One-piece, composite crucible with integral withdrawal/discharge section.
Carter ; Jr. William Thomas ; Benz Mark Gilbert ; Zabala Robert John ; Dupree Paul Leonard ; Knudsen Bruce Alan, Systems for flow control in electroslag refining process.
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