Methods of manufacturing large-area sputtering targets using interlocking joints
View Patent ↗In various embodiments, joined sputtering targets are formed at least in part by spray deposition of the sputtering material and/or welding.
1. A method of forming a joined sputtering target comprising a sputtering material, the method comprising:
forming a mechanical joint between two discrete sputtering-target tiles by (i) overlapping or (ii) overlapping and interlocking the tiles at an interface therebetween, the interface comprising a recess over the mechanical joint, and each of the tiles consisting essentially of the sputtering material;
after (i) overlapping or (ii) overlapping and interlocking the tiles at the interface therebetween, joining the tiles by welding the mechanical joint; and
thereafter, spray-depositing a spray material over at least a portion of the welded mechanical joint to substantially fill at least a portion of the recess, thereby forming the joined sputtering target.
2. The method of claim 1 , wherein welding the mechanical joint comprises resistance seam welding, the resistance seam welding comprising (i) contacting a top surface of the mechanical joint with a first electrode disposed at least partially within the recess, (ii) contacting a bottom surface of the mechanical joint with a second electrode, the bottom surface being opposite the top surface, (iii) applying a mechanical force to the mechanical joint with at least one of the first or second electrodes, and (iv) passing an electrical current between the first and second electrodes.
3. The method of claim 1 , wherein the sputtering material comprises a mixture or alloy of at least two constituent materials.
4. The method of claim 3 , wherein welding the mechanical joint comprises melting at least one constituent material, at least one other constituent material remaining unmelted thereduring.
5. The method of claim 3 , wherein the at least two constituent materials comprise Mo and Ti.
6. The method of claim 3 , wherein the spray material comprises at least one of the constituent materials.
7. The method of claim 1 , wherein the spray material comprises the sputtering material.
8. The method of claim 7 , wherein the spray material consists essentially of the sputtering material.
9. The method of claim 1 , wherein the mechanical joint comprises an interlocking joint, the interlocking joint comprising a tongue-in-groove joint, a dovetail joint, a rabbet joint, a finger joint, or a spline joint.
10. The method of claim 1 , wherein at least a portion of each of the two tiles is substantially planar.
11. The method of claim 1 , wherein at least a portion of each of the two tiles is substantially tubular.
12. The method of claim 1 , wherein the recess is defined by a beveled surface of at least one of the two tiles.
13. The method of claim 12 , wherein the beveled surface is reentrant.
14. The method of claim 12 , wherein at least a portion of the beveled surface is substantially planar and forms an angle of greater than 45° with respect to a normal to a top surface of the joined sputtering target.
15. The method of claim 14 , wherein the angle is selected from the range of 45° to 60°.
16. The method of claim 12 , wherein spray-depositing the spray material comprises spray-depositing at an angle approximately perpendicular to the beveled surface.
17. The method of claim 16 , wherein spray-depositing the spray material comprises:
spray-depositing a first portion of the spray material at an angle approximately perpendicular to the beveled surface; and
thereafter, spray-depositing a second portion of the spray material at an angle approximately perpendicular to a top surface of the joined sputtering target.
18. The method of claim 1 , further comprising, after forming the joined sputtering target, annealing the joined sputtering target at a temperature selected from the range of approximately 480° C. to approximately 1425° C.
19. The method of claim 1 , further comprising, after forming the joined sputtering target, disposing the joined sputtering target on a backing plate.
20. The method of claim 1 , wherein spray-depositing the spray material comprises cold spray.
21. The method of claim 1 , further comprising, after forming the joined sputtering target, heat treating the joined sputtering target at least proximate the spray material.
22. The method of claim 1 , wherein the mechanical joint is formed by overlapping the tiles at the interface therebetween.
23. The method of claim 1 , wherein the mechanical joint is formed by overlapping and interlocking the tiles at the interface therebetween.