Patent ID: 9011652
Filing Date: 2015-04-21
Classification: B23K,C23C,H01J

Abstract:
1. A rotary sputtering target assembly comprising: a backing tube having a length and an outer surface at an outer diameter; a rotary sputtering target of a malleable material having a high weight to strength ratio, the sputtering target placed over the backing tube and having a length less than the length of said backing tube and an inner surface at an inner diameter greater than the outer diameter of the backing tube; a bonding material or sealing layer adhered to the inner diameter of the said rotary sputtering target and the outer diameter of said backing tube only proximate both ends of the sputtering target such that the bonding material or sealing layer is discontinuous along the outer surface of the backing tube creating both a fluid resistance vacuum seal and a continuous annular and open gap between the outer surface of the backing tube and the inner surface of the sputtering target and extending along the remainder of the length and periphery of the backing tube between the bonded or sealed ends of the sputtering target; the backing tube further being perforated in at least the entire periphery and length of the backing tube between the bonded or sealed ends, the gap being in fluid communication with the interior of the backing tube through the perforated backing tube to allow for cooling fluid during sputtering to flow through the gap and directly contact the entire inner surface of the sputtering target between the sputtering target ends, thereby to allow for more of the sputtering target to be sputtered without deformation of the sputtering target at high rates and to allow the spent sputtering target to be readily removed from the backing tube after use.