CA1263062A - Production of spray deposits - Google Patents
Production of spray depositsInfo
- Publication number
- CA1263062A CA1263062A CA000522808A CA522808A CA1263062A CA 1263062 A CA1263062 A CA 1263062A CA 000522808 A CA000522808 A CA 000522808A CA 522808 A CA522808 A CA 522808A CA 1263062 A CA1263062 A CA 1263062A
- Authority
- CA
- Canada
- Prior art keywords
- collector
- spray
- deposit
- atomizing device
- axis
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000007921 spray Substances 0.000 title claims abstract description 63
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 24
- 230000008021 deposition Effects 0.000 claims abstract description 16
- 229910001092 metal group alloy Inorganic materials 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000010355 oscillation Effects 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 5
- 229910001338 liquidmetal Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 230000003019 stabilising effect Effects 0.000 claims 1
- 238000000151 deposition Methods 0.000 abstract description 11
- 238000005266 casting Methods 0.000 abstract description 2
- 230000001419 dependent effect Effects 0.000 abstract description 2
- 230000000087 stabilizing effect Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011156 metal matrix composite Substances 0.000 description 1
- 239000013528 metallic particle Substances 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
Abstract
ABSTRACT
A method and apparatus for the production of spray deposited ingot, disc or bar is provided in which a spray of gas atomized molten metal or metal alloy particles generated with an atomizing device is directed onto a collector. The collector is rotated about an axis of rotation and a controlled amount of heat is extracted from the atomized particles in flight and on deposition. In order to maintain a substantially constant distance between the atomizing device and the surface of the deposited metal or metal alloy there is relative movement between the atomizing device and the collector. The spray is directed so that the main axis of the spray and the axis of rotation of the collector are inclined at an angle to one another; and the spray is oscillated so that the main axis of the spray oscillates relative to the axis of rotation of the collector. By the method of the invention the shape of deposit is not dependent on the shape or physical containment of the collector i.e., for example, a mould as used in a casting process is not required.
A method and apparatus for the production of spray deposited ingot, disc or bar is provided in which a spray of gas atomized molten metal or metal alloy particles generated with an atomizing device is directed onto a collector. The collector is rotated about an axis of rotation and a controlled amount of heat is extracted from the atomized particles in flight and on deposition. In order to maintain a substantially constant distance between the atomizing device and the surface of the deposited metal or metal alloy there is relative movement between the atomizing device and the collector. The spray is directed so that the main axis of the spray and the axis of rotation of the collector are inclined at an angle to one another; and the spray is oscillated so that the main axis of the spray oscillates relative to the axis of rotation of the collector. By the method of the invention the shape of deposit is not dependent on the shape or physical containment of the collector i.e., for example, a mould as used in a casting process is not required.
Description
PRODUCT~ON OF SPRAY DEPOSITS
This invention relates to method and apparatus for the production of spray deposited ingots, discs, billet or bar.
At present a disc or ingot can be formed by directing a spray of gas atomized molten metal or metal alloy at a collector which is tilted at an angle to the spray axis in order to provide a more favourable angle of impingement of the atomized particles onto the already deposited metal. The collector is rotated and simultaneously oscillated and may be moved away from the spra~ to maintain a constant spray dlstance. For example US 4066117 discloses such an apparatus but in that arrangement it is essential that khe collector is a mould includes side walls. As clearly indicated in Fig~ 11 of that patent, when the depth of the mould is e~ceeded, the dimensional control of the deposit is completely lost. Another problem, even if the deposit were to continue to be built up in the uncontrolled manner, would be that, as the collector is tilted at an angle, the centre of gravity of the deposit the collector so making the deposit unstable and reciprocation of the collector more difficult, if not impossible.
According to the present invention a method for the production of spray deposited ingot, disc or bar comprises the steps of gene~rating a spray of gas atomized molten metal or metal alloy particles with an atomizing device, directing the spray onto a collector, rotating the collector about an axis of rotation, extracting a controlled amount of heat from the atomized particles in flight and on deposition, effecting ~3~8 i relative movemenk between the atomizing devic~ and the collector in order to maintain a constant distance between the atomizing spray head and the surface of the deposit~d metal or metal alloy, directing the spray so that ths main axis of the spray and the axis of rotation of the collector are lnclined at an angle to one another and, oscillating the spray so that the main axis of the spray oscillates relative to the axis of rotation of the collector.
With this method it is possible to position a collector horizontally or vertically or any other direction.
The invention also incl-tdes an apparakus for the production of spray deposited ingot, disc or bar comprising a collector rotatable about an axis of rotation, an atomizing device arranged to direct a spray of molten metal or metal alloy at the collector and to oscillate the spray across the surface of the collector or the deposit building up thereon with the main axis of the spray and the collector being inclined at an angle to one another, and means for effecting relative movement between the atomizing device and the collector.
The atomizing device is preferably a device including means movable relative to the stream of liquid metal from which the spray is formed whereby movement is imparted to the spray.
The invention will now be described by way of example with reference to the accompanying diagrammatic drawings in which:
Figure 1 illustrates one embodiment of the invention applied to the formation of bar;
~r~
Figure 2 illustrates a second embodiment of the invention applied to the formation of ba:r;
Figure 3 is an end view in the direction of arrow C in Figure 2;
Figure 4 shows a further embodiment of the invention as applied to a disc or ingot;
Figure 5 shows another embodiment of the invention as applied to a disc or ingot; and Figure 6 illustrates a diagrammatic view o~ apparatus for moving the spray.
In Fig. 1 a collector 1 is rotatable about an axis of rotation 2 and is movable along said axis as indicated by the arrow A. An atomizing device 3 is positioned so as to be inclined to the axis of rotation 2 so that the spray of metal or metal alloy droplets created by the atomizing device 3 arrives at the surface of the collector at an angle to the axis of rotation. The atomiæing device 3 is arranged to tilt about an axis passing through the atomizer so~that the main axis of the spray oscillates across the surface of the collector .and the deposit building up thereon as indicated by the arrow B. As the deposit increases in size the collector 1 is withdrawn so that the distance between the surface of the deposit and the dtomizing device remains substantially constant.
In order to key the deposit to the collector 1, the col~ector 1 is suitably formed with a central projection 4 (or depr~ssion) about which the initial layers of the deposit form.
Moreover, as the deposit 5 grows in size, the deposit may be stabilized by side stabilizing devices 6 which include bearing rollers 7 to allow continued withdrawal as the deposit increases in size. After the initial support provided by the collector 1 the diameter or cross-sectional shape of the deposit, within limits, is substantially determined and controlled by the movements of the spray, the rate of withdrawal of the collector and the rate of dsposition. Providing the metal or metal alloy being deposited is in the correct "state" at and on deposition i.e. the correct and controlled amount of heat has been extracted including the superheat and a large proportion or all of the latent heat, a mould to apply predetermined dimensions to the deposit as it builds up is not re~uired.
The heat extraction from the atomized particles before and after deposition occurs in three main stages:
(i) in-flight cooling mainly by convective heat transfer to the atomizing gas. Cooling will typically be in the range 10-3 - 10-6C/sec depending mainly on the size of the atomized particles. (Typically atomized particle sizes are in the size range 1-500 microns~;
(ii) on deposition, cooling both by convection to the atomizing gas as it flows over the surface of the spray deposit and also by conduction to the already deposited metal; and 'X
~3~
(iii) after deposition cooling by conduction to the already deposited metal.
It is sssential to carefully control the heat extraction in each of the three above stages. It is also important to ensure that the surface of the already deposited metal consists of a relatively thin layer of semi-solid/semi-liquid metal into which newly arriving atomized partic]es are deposited. This is achieved by extracting heat from the atcmized particles by supplying gas to the atomizing device under carefully controlled conditions of flow, pressure, temperature and gas to metal ratio and by controlling the Eurther extraction of heat aEter deposition.
If desired the rate of the conduction of heat on and after deposition may be increased by applying cold injected particles as disclosed in our European patent application published under No. 0198613. In addition a metal matrix composite bar, ingot or disc can be produced by incorporating metallic or non-metallic particles or fibres into the atomized spray.
In Fig~ 2 a similar arrangement to Fig. 1 is shown except that the collector 1 is positioned vertically as opposed to horizontally. This arrangement is preferable for continuous production methods but additionally requires stabilizing supports 8, similar to the stabilizing devices 6 which hold the formed bar as it is withdrawn in the direction of arrow A in order to maintain the spray distance between the atomizing device 3 and the surface of the deposit substantially constant. As seen rrom Fig. 3 and the arrows included on the stabilizing supports 8, the stabilizing supports 8 are movable axially so that end bearing rollers 9 can accommodate surface irregularities with~ut preventing continued withdrawal of the deposit.
In Fig. 4 a disc or ingot deposit 10 is formed on a collector 11 which is rotated under the spray 12 about an axis 13 transverse to the main axis 14 of the spray. As with the embodiment of Fig.l, the spray 12 is oscillated as indicated by the arrow so as to scan the surface of the deposit as it is rotated about axis 13. As the deposit 10 builds up on the collector 11, the collector is retracted in an axial direction in order to maintain a substantially constant spray distance.
The arrangement of Fig. 5 is similar to that of Fig. ~
except that the collector and the axis of rotation are inclined to a spray 15 generated so as to have a generally vertical main axis 14. The shape of the deposit is again determined solely by the inter-relationship between the movement of the spray 15, the rate of deposition and the withdrawal of the collector and, after initial deposition, is not dependent in any way, on the shape or physical containment of the collector (i.e. for example a mould as used in a casting process is not required).
The oscillation of the spray in tha embodiment is preferably achieved by oscillation of the atomizing device itself. For example the atomizing device may be as diagrammatically illustrated in Fig. 6 and mounted at an inclined angle.
æ
In Fig. 6 a metal stream 21 is teemed through an atomizing device 22. The device 22 i5 generally annular in shape and is supported by diametrically projecting supports 23. The supports 23 also serve to supply atomizing gas to the at:omizing device in order to atomize the stream 2~ into a spray 24. In order to impart movement to the spray 24 the projecting supports 23 are mounted in bearings (not shown~ so that the whole atomising device 22 is able to tilt about the axis defined by the projecting supports 23. The control of the tilting of the atomising device 22 comprises an eccentric cam 25 and a ~am follower 26 connected to one of the supports 23. By alterincJ the speed of rotation of the cam 25 the rate of oscillation of the atomising device 22 can be varied. In addition, by changing the surface profile of the cam 25, the speed of oscillation at any instant during the cycle of cam 25, can be varied. The oscillation can be of the order of 5 to 30 cycles per second for obtaining a particular desired shape to a deposit. Full details of the preferred apparatus may be obtained from our European Patent Application published under No. 2l250l080O
The oscillations of the spray are suitably a to and fro motion so that, as the collector rotates, a deposition pattern is created on the already deposited metal. If the speed of oscillatlon relative to the speed of collector rotation is kept low, the patterns can be made discernable by arrangin~ for the oscillations per revolution to be in phase with the rotation of the collector. If the number of oscillations is, say exactly ~'X
~63~
four per r~volution, a deposit with four axes of symmetry can be formed, for example s~uare bar. Alternatively, the cross section of the deposit may be affected by varying the speed of rotation and the spread of the oscillation of the spray such that the whole surface of the deposit is substantially covered at some time during the cycle by the main axis of the spray. The size of the deposit is determined as a function of the rate of withdrawal and the metal deposition rate. Although, the atomizing conditions can be maintained substantially constant some variations may occur in practice. Accordingly, in order to maintain a constant size of bar, the diameter or cross-sectional area may be monitored and the speed of withdrawal varied to compensate ~or, for example, changes in metal flow rate.
Whilst the invention has been particularly described with reference to moving the collector, it will be understood that it may be d~sireable alternatively to raise the atomizing device instead in order to maintain a substantially constant spray distance. Moreover, for simplicity, the chamber in which spray depositio~ takes place has been omitted from all the Figures except Fig. 1. In that Figure a chamber 30 is shown for providing a desired atmosphere such as, an inert atmosphere, atomiziny gas is exhausted at 31, and any overspray powder is collected at 32.
'~
This invention relates to method and apparatus for the production of spray deposited ingots, discs, billet or bar.
At present a disc or ingot can be formed by directing a spray of gas atomized molten metal or metal alloy at a collector which is tilted at an angle to the spray axis in order to provide a more favourable angle of impingement of the atomized particles onto the already deposited metal. The collector is rotated and simultaneously oscillated and may be moved away from the spra~ to maintain a constant spray dlstance. For example US 4066117 discloses such an apparatus but in that arrangement it is essential that khe collector is a mould includes side walls. As clearly indicated in Fig~ 11 of that patent, when the depth of the mould is e~ceeded, the dimensional control of the deposit is completely lost. Another problem, even if the deposit were to continue to be built up in the uncontrolled manner, would be that, as the collector is tilted at an angle, the centre of gravity of the deposit the collector so making the deposit unstable and reciprocation of the collector more difficult, if not impossible.
According to the present invention a method for the production of spray deposited ingot, disc or bar comprises the steps of gene~rating a spray of gas atomized molten metal or metal alloy particles with an atomizing device, directing the spray onto a collector, rotating the collector about an axis of rotation, extracting a controlled amount of heat from the atomized particles in flight and on deposition, effecting ~3~8 i relative movemenk between the atomizing devic~ and the collector in order to maintain a constant distance between the atomizing spray head and the surface of the deposit~d metal or metal alloy, directing the spray so that ths main axis of the spray and the axis of rotation of the collector are lnclined at an angle to one another and, oscillating the spray so that the main axis of the spray oscillates relative to the axis of rotation of the collector.
With this method it is possible to position a collector horizontally or vertically or any other direction.
The invention also incl-tdes an apparakus for the production of spray deposited ingot, disc or bar comprising a collector rotatable about an axis of rotation, an atomizing device arranged to direct a spray of molten metal or metal alloy at the collector and to oscillate the spray across the surface of the collector or the deposit building up thereon with the main axis of the spray and the collector being inclined at an angle to one another, and means for effecting relative movement between the atomizing device and the collector.
The atomizing device is preferably a device including means movable relative to the stream of liquid metal from which the spray is formed whereby movement is imparted to the spray.
The invention will now be described by way of example with reference to the accompanying diagrammatic drawings in which:
Figure 1 illustrates one embodiment of the invention applied to the formation of bar;
~r~
Figure 2 illustrates a second embodiment of the invention applied to the formation of ba:r;
Figure 3 is an end view in the direction of arrow C in Figure 2;
Figure 4 shows a further embodiment of the invention as applied to a disc or ingot;
Figure 5 shows another embodiment of the invention as applied to a disc or ingot; and Figure 6 illustrates a diagrammatic view o~ apparatus for moving the spray.
In Fig. 1 a collector 1 is rotatable about an axis of rotation 2 and is movable along said axis as indicated by the arrow A. An atomizing device 3 is positioned so as to be inclined to the axis of rotation 2 so that the spray of metal or metal alloy droplets created by the atomizing device 3 arrives at the surface of the collector at an angle to the axis of rotation. The atomiæing device 3 is arranged to tilt about an axis passing through the atomizer so~that the main axis of the spray oscillates across the surface of the collector .and the deposit building up thereon as indicated by the arrow B. As the deposit increases in size the collector 1 is withdrawn so that the distance between the surface of the deposit and the dtomizing device remains substantially constant.
In order to key the deposit to the collector 1, the col~ector 1 is suitably formed with a central projection 4 (or depr~ssion) about which the initial layers of the deposit form.
Moreover, as the deposit 5 grows in size, the deposit may be stabilized by side stabilizing devices 6 which include bearing rollers 7 to allow continued withdrawal as the deposit increases in size. After the initial support provided by the collector 1 the diameter or cross-sectional shape of the deposit, within limits, is substantially determined and controlled by the movements of the spray, the rate of withdrawal of the collector and the rate of dsposition. Providing the metal or metal alloy being deposited is in the correct "state" at and on deposition i.e. the correct and controlled amount of heat has been extracted including the superheat and a large proportion or all of the latent heat, a mould to apply predetermined dimensions to the deposit as it builds up is not re~uired.
The heat extraction from the atomized particles before and after deposition occurs in three main stages:
(i) in-flight cooling mainly by convective heat transfer to the atomizing gas. Cooling will typically be in the range 10-3 - 10-6C/sec depending mainly on the size of the atomized particles. (Typically atomized particle sizes are in the size range 1-500 microns~;
(ii) on deposition, cooling both by convection to the atomizing gas as it flows over the surface of the spray deposit and also by conduction to the already deposited metal; and 'X
~3~
(iii) after deposition cooling by conduction to the already deposited metal.
It is sssential to carefully control the heat extraction in each of the three above stages. It is also important to ensure that the surface of the already deposited metal consists of a relatively thin layer of semi-solid/semi-liquid metal into which newly arriving atomized partic]es are deposited. This is achieved by extracting heat from the atcmized particles by supplying gas to the atomizing device under carefully controlled conditions of flow, pressure, temperature and gas to metal ratio and by controlling the Eurther extraction of heat aEter deposition.
If desired the rate of the conduction of heat on and after deposition may be increased by applying cold injected particles as disclosed in our European patent application published under No. 0198613. In addition a metal matrix composite bar, ingot or disc can be produced by incorporating metallic or non-metallic particles or fibres into the atomized spray.
In Fig~ 2 a similar arrangement to Fig. 1 is shown except that the collector 1 is positioned vertically as opposed to horizontally. This arrangement is preferable for continuous production methods but additionally requires stabilizing supports 8, similar to the stabilizing devices 6 which hold the formed bar as it is withdrawn in the direction of arrow A in order to maintain the spray distance between the atomizing device 3 and the surface of the deposit substantially constant. As seen rrom Fig. 3 and the arrows included on the stabilizing supports 8, the stabilizing supports 8 are movable axially so that end bearing rollers 9 can accommodate surface irregularities with~ut preventing continued withdrawal of the deposit.
In Fig. 4 a disc or ingot deposit 10 is formed on a collector 11 which is rotated under the spray 12 about an axis 13 transverse to the main axis 14 of the spray. As with the embodiment of Fig.l, the spray 12 is oscillated as indicated by the arrow so as to scan the surface of the deposit as it is rotated about axis 13. As the deposit 10 builds up on the collector 11, the collector is retracted in an axial direction in order to maintain a substantially constant spray distance.
The arrangement of Fig. 5 is similar to that of Fig. ~
except that the collector and the axis of rotation are inclined to a spray 15 generated so as to have a generally vertical main axis 14. The shape of the deposit is again determined solely by the inter-relationship between the movement of the spray 15, the rate of deposition and the withdrawal of the collector and, after initial deposition, is not dependent in any way, on the shape or physical containment of the collector (i.e. for example a mould as used in a casting process is not required).
The oscillation of the spray in tha embodiment is preferably achieved by oscillation of the atomizing device itself. For example the atomizing device may be as diagrammatically illustrated in Fig. 6 and mounted at an inclined angle.
æ
In Fig. 6 a metal stream 21 is teemed through an atomizing device 22. The device 22 i5 generally annular in shape and is supported by diametrically projecting supports 23. The supports 23 also serve to supply atomizing gas to the at:omizing device in order to atomize the stream 2~ into a spray 24. In order to impart movement to the spray 24 the projecting supports 23 are mounted in bearings (not shown~ so that the whole atomising device 22 is able to tilt about the axis defined by the projecting supports 23. The control of the tilting of the atomising device 22 comprises an eccentric cam 25 and a ~am follower 26 connected to one of the supports 23. By alterincJ the speed of rotation of the cam 25 the rate of oscillation of the atomising device 22 can be varied. In addition, by changing the surface profile of the cam 25, the speed of oscillation at any instant during the cycle of cam 25, can be varied. The oscillation can be of the order of 5 to 30 cycles per second for obtaining a particular desired shape to a deposit. Full details of the preferred apparatus may be obtained from our European Patent Application published under No. 2l250l080O
The oscillations of the spray are suitably a to and fro motion so that, as the collector rotates, a deposition pattern is created on the already deposited metal. If the speed of oscillatlon relative to the speed of collector rotation is kept low, the patterns can be made discernable by arrangin~ for the oscillations per revolution to be in phase with the rotation of the collector. If the number of oscillations is, say exactly ~'X
~63~
four per r~volution, a deposit with four axes of symmetry can be formed, for example s~uare bar. Alternatively, the cross section of the deposit may be affected by varying the speed of rotation and the spread of the oscillation of the spray such that the whole surface of the deposit is substantially covered at some time during the cycle by the main axis of the spray. The size of the deposit is determined as a function of the rate of withdrawal and the metal deposition rate. Although, the atomizing conditions can be maintained substantially constant some variations may occur in practice. Accordingly, in order to maintain a constant size of bar, the diameter or cross-sectional area may be monitored and the speed of withdrawal varied to compensate ~or, for example, changes in metal flow rate.
Whilst the invention has been particularly described with reference to moving the collector, it will be understood that it may be d~sireable alternatively to raise the atomizing device instead in order to maintain a substantially constant spray distance. Moreover, for simplicity, the chamber in which spray depositio~ takes place has been omitted from all the Figures except Fig. 1. In that Figure a chamber 30 is shown for providing a desired atmosphere such as, an inert atmosphere, atomiziny gas is exhausted at 31, and any overspray powder is collected at 32.
'~
Claims (15)
1. A method for the production of spray deposited ingot, disc or bar comprising the steps of generating a spray of gas atomized molten metal or metal alloy particles with an atomizing device;
directing the spray onto a collector;
rotating the collector about an axis of rotation;
extracting a controlled amount of heat from the atomized particles in flight and on deposition;
effecting relative movement between the atomizing device and the collector in order to maintain a substantially constant distance between the atomizing head and the surface of the deposited metal or metal alloy;
directing the spray so that the main axis of the spray and the axis of rotation of the collector are inclined at an angle to one another; and oscillating the spray so that the main axis of the spray oscillates relative to the axis of rotation of the collector.
directing the spray onto a collector;
rotating the collector about an axis of rotation;
extracting a controlled amount of heat from the atomized particles in flight and on deposition;
effecting relative movement between the atomizing device and the collector in order to maintain a substantially constant distance between the atomizing head and the surface of the deposited metal or metal alloy;
directing the spray so that the main axis of the spray and the axis of rotation of the collector are inclined at an angle to one another; and oscillating the spray so that the main axis of the spray oscillates relative to the axis of rotation of the collector.
2. A method according to Claim 1 wherein the relative movement between the atomizing device and the collector comprises withdrawing the collector in the direction of said axis of rotation.
3. A method according to Claim 1 or 2 wherein the extraction of a controlled amount of heat comprises in-flight cooling substantially by convection to the atomising gas, on deposition cooling by convection to the atomising gas as it flows over the surface of the deposit, and on deposition cooling by conduction, the extraction of heat and the relative movement effected between the atomising device and the collector being controlled such that the surface of the already deposited metal consists of a layer of semi-solid/semi-liquid metal into which the newly arriving atomised particles are deposited.
4. A method according to Claim 1 or 2 further comprising, after initial deposition, determining the shape of the deposit solely by the interrelationship between the movement of the collector and the movement of the spray.
5. A method according to Claim 1 wherein the speed of oscillation of the spray is an integer multiple of the speed of rotation of the collector.
6. A method according to Claim 5 wherein the integer multiple is 4 to form a deposit with four axes of symmetry, and the spread of the spray is controlled such that the deposit formed is a bar substantially square in cross-section.
7. A method according to Claim 2 comprising varying the rotational speed of the collector within each revolution to shape the deposit to provide a desired cross-section.
8. Apparatus for the production of spray deposited ingot, disc, or bar comprising an atomizing device including an opening through which a stream of molten metal or metal alloy may be passed in use, means for passing an atomizing gas to the atomising device, a plurality of atomizing jets in the atomizing device through which the atomizing gas may issue to generate a spray of particles from the stream of molten metal or metal alloy, a collector rotatable about an axis of rotation and positioned relative to the atomizing device to receive a spray of molten metal or metal alloy generated by the atomizing device, means for oscillating the spray across the surface of the collector or a deposit building up thereon, the atomizing device and the collector being so positioned relative to one another that the spray generated by the atomizing device and the collector are inclined at an angle to one another, and means for effecting relative movement between the atomizing device and the collector in order to maintain a substantially constant distance between the atomizing device and the surface of the metal or metal alloy being deposited upon the collector.
9. Apparatus according to Claim 8 wherein the or a part of the atomising device movable relative to the stream of molten metal from which the spray is formed whereby movement is imparted to the spray.
10. Apparatus according to Claim 8 or 9 including means for stabilising a deposit as it grows in size following deposition on the collector.
11. Apparatus according to Claim 8 or 9 wherein the collector is substantially horizontal.
12. Apparatus according to Claim 8 or 9 wherein the collector is substantially vertical.
13. Apparatus according to Claim 8 or 9 wherein the means for effecting relative movement comprises means for withdrawing the collector relative to the atomising head.
14. Apparatus according to Claim 8 or 9 wherein the collector includes a substantially central projection on which the deposit is keyed.
15. Apparatus according to Claim 9 wherein the movement of the atomising device is controlled by control means selected from mechanical means comprising a co-operable cam and cam follower, electro-mechanical means comprising a programme controlled stepper motor, or hydraulic means comprising a programme controlled electro-hydraulic servo mechanism.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8527855 | 1985-11-12 | ||
| GB858527855A GB8527855D0 (en) | 1985-11-12 | 1985-11-12 | Spray deposits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1263062A true CA1263062A (en) | 1989-11-21 |
Family
ID=10588089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000522808A Expired CA1263062A (en) | 1985-11-12 | 1986-11-12 | Production of spray deposits |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1263062A (en) |
| GB (1) | GB8527855D0 (en) |
-
1985
- 1985-11-12 GB GB858527855A patent/GB8527855D0/en active Pending
-
1986
- 1986-11-12 CA CA000522808A patent/CA1263062A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB8527855D0 (en) | 1985-12-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |