METHOD OF MANUFACTURING A HEAT DISSIPATION DEVICE
A method of manufacturing a heat dissipation device is disclosed. The heat dissipation device manufactured with the method includes two titanium metal sheets, which are subjected to a heat treatment before undergoing mechanical processing, plastic working and surface modification. With these arrangements, the titanium metal sheets can be freely plastically deformed and possess a capillary force, and can therefore be used in place of the conventional copper material to serve as a material for making heat dissipation devices, and the heat dissipation devices so produced can have largely reduced weight and largely improved heat dissipation performance.
1 . A method of manufacturing a heat dissipation device, comprising the following steps:
preparing a first titanium metal sheet and a second titanium metal sheet, and carrying out a pre-cleaning operation for the first and second titanium metal sheets;
performing a heat treatment on the cleaned first and second titanium metal sheets;
stamping the first titanium metal sheet to form a plurality of raised sections thereon;
bonding a metal mesh to one surface of the second titanium metal sheet; and
closing a surface of the first titanium metal sheet having the raised sections onto the surface of the second titanium metal sheet having the metal mesh bonded thereto, and carrying out subsequent operations, including seam welding, working fluid filling, vacuuming and sealing.
2 . The method of manufacturing a heat dissipation device as claimed in claim 1 , wherein, in the pre-cleaning operation, the prepared first and second titanium metal sheets are wiped with acetone and then washed with de-ionized water in an ultrasonic cleaning machine; and, finally, surfaces of the first and second titanium metal sheets are dried with nitrogen gas.
3 . The method of manufacturing a heat dissipation device as claimed in claim 1 , wherein, in the heat treatment step, the first and the second titanium metal sheet are positioned in an atmosphere furnace and argon gas is supplied into the atmosphere furnace; and the atmosphere furnace is then heated to 400° C.˜700° C. for 30˜90 minutes.
4 . The method of manufacturing a heat dissipation device as claimed in claim 1 , further comprising a step after the metal mesh bonding step to perform a surface modification treatment on the first and the second titanium metal sheet, so that at least one coating is formed on a surface of each of the first titanium metal sheet, the second titanium metal sheet and the metal mesh.
5 . The method of manufacturing a heat dissipation device as claimed in claim 4 , wherein the at least one coating is selected from the group consisting of a hydrophilic coating and a hydrophobic coating.
6 . The method of manufacturing a heat dissipation device as claimed in claim 4 , wherein the at least one coating is selected from the group consisting of a titanium dioxide (TiO 2 ) coating and a silicon dioxide (SiO 2 ) coating.
7 . The method of manufacturing a heat dissipation device as claimed in claim 1 , wherein the metal mesh is bonded to the second titanium metal sheet by means of diffusion bonding.
8 . The method of manufacturing a heat dissipation device as claimed in claim 7 , wherein the metal mesh is bonded to the second titanium metal sheet at a diffusion bonding temperature of 650° C.˜850° C. for a process time of 30˜90 minutes.
9 . The method of manufacturing a heat dissipation device as claimed in claim 4 , wherein, in the surface modification treatment performed on the first and the second titanium metal sheet, the first and the second titanium metal sheet are positioned in an atmosphere furnace and argon gas is supplied into the atmosphere furnace, the atmosphere furnace is then heated to 400° C.˜700° C. for 30˜90 minutes, so that a reduction reaction due to overheating occurs on the surfaces of the first and the second titanium metal sheet.
10 . The method of manufacturing a heat dissipation device as claimed in claim 4 , wherein, in the surface modification treatment performed on the first and the second titanium metal sheet, the first and the second titanium metal sheet are positioned in an atmosphere furnace, the atmosphere furnace is then vacuumed and heated to 400° C.˜700° C. for 30˜90 minutes, so that a reduction reaction due to overheating occurs on the surfaces of the first and the second titanium metal sheet.
11 . The method of manufacturing a heat dissipation device as claimed in claim 4 , wherein the surface modification treatment is performed on the first and the second titanium metal sheet via a sol-gel coating process, in which the first and the second titanium metal sheet are positioned in an atmosphere furnace, the atmosphere furnace is then vacuumed and heated to 400° C.˜700° C. for 30˜90 minutes, so that a coating is formed on the surfaces of the first and the second titanium metal sheet.
12 . The method of manufacturing a heat dissipation device as claimed in claim 11 , wherein the coating formed on the surfaces of the first and the second titanium metal sheet in the surface modification treatment can be any one of a titanium dioxide coating and a silicon dioxide coating.
13 . The method of manufacturing a heat dissipation device as claimed in claim 4 , wherein the surface modification treatment is performed on the first and the second titanium metal sheet via a sol-gel coating process, in which the first and the second titanium metal sheet are positioned in an atmosphere furnace and argon gas is supplied into the atmosphere furnace, the atmosphere furnace is then heated to 400° C.˜700° C. for 30˜90 minutes, so that a coating is formed on the surfaces of the first and the second titanium metal sheet.
14 . The method of manufacturing a heat dissipation device as claimed in claim 1 , wherein, in the step of closing the first and second titanium metal sheets to each other and welding seams between them, the seam welding operation is performed by means of laser beam welding technique using a laser beam having a wavelength of 1030 nm and a laser power of 100-500 W; and the seam welding operation can be performed in a working environment having a protective gas supplied thereinto or in a vacuum environment of 10 −2 torr; and the protective gas can be helium or argon with a helium leak rate smaller than 1.0×10 −8 mbar-L/sec.