Heat dissipation unit and manufacturing method thereof and thermal module thereof

Abstract

A heat dissipation unit and a manufacturing method thereof and a thermal module thereof. The heat dissipation unit includes a metal main body having a chamber, an oxide coating and a working fluid. The oxide coating is coated on wall surface of the chamber instead of capillary structure. The oxide coating serves to enhance vapor/liquid circulation efficiency of the working fluid in the chamber of the heat dissipation unit so as to increase heat dissipation efficiency.

1 . A heat dissipation unit comprising a metal main body having a chamber, an oxide coating and a working fluid, the oxide coating being coated on wall surface of the chamber. 
     
     
         2 . The heat dissipation unit as claimed in  claim 1 , wherein the metal main body is selected from a group consisting of heat pipe, heat spreader, thin heat pipe and flat-plate heat pipe. 
     
     
         3 . The heat dissipation unit as claimed in  claim 1 , wherein the oxide coating is selected from a group consisting of silicon oxide (SiO 2 ), titanium oxide (TiO 2 ), aluminum oxide (Al 2 O 3 ), zirconium oxide (ZrO 2 ), calcium oxide (CaO), potassium oxide (K 2 O) and zinc oxide (ZnO). 
     
     
         4 . The heat dissipation unit as claimed in  claim 1 , wherein the oxide coating is a hydrophobic coating or a hydrophilic coating. 
     
     
         5 . The heat dissipation unit as claimed in  claim 1 , further comprising a capillary structure disposed in the chamber, the capillary structure being selected from a group consisting of sintered powder body, channeled body and mesh body. 
     
     
         6 . A manufacturing method of a heat dissipation unit, comprising steps of:
 preparing a heat dissipation unit with a chamber;   coating wall surface of the chamber of the heat dissipation unit with at least one layer of oxide coating;   vacuuming the heat dissipation unit and filling working fluid into the chamber; and   sealing the heat dissipation unit.   
     
     
         7 . The manufacturing method of the heat dissipation unit as claimed in  claim 6 , wherein the oxide coating is selected from a group consisting of silicon oxide (SiO 2 ), titanium oxide (TiO 2 ), aluminum oxide (Al 2 O 3 ), zirconium oxide (ZrO 2 ), calcium oxide (CaO), potassium oxide (K 2 O) and zinc oxide (ZnO). 
     
     
         8 . The manufacturing method of the heat dissipation unit as claimed in  claim 6 , wherein the oxide coating is a hydrophobic coating or a hydrophilic coating. 
     
     
         9 . The manufacturing method of the heat dissipation unit as claimed in  claim 6 , wherein the heat dissipation unit is selected from a group consisting of heat pipe, heat spreader, thin heat pipe and flat-plate heat pipe. 
     
     
         10 . The manufacturing method of the heat dissipation unit as claimed in  claim 6 , wherein the heat dissipation unit is made of a material selected from a group consisting of copper, aluminum, nickel and stainless steel. 
     
     
         11 . The manufacturing method of the heat dissipation unit as claimed in  claim 6 , wherein the oxide coating is coated on the wall surface of the chamber of the heat dissipation unit by means of physical vapor deposition (PVD). 
     
     
         12 . The manufacturing method of the heat dissipation unit as claimed in  claim 6 , wherein the oxide coating is coated on the wall surface of the chamber of the heat dissipation unit by means of chemical vapor deposition (CVD). 
     
     
         13 . The manufacturing method of the heat dissipation unit as claimed in  claim 6 , wherein the oxide coating is coated on the wall surface of the chamber of the heat dissipation unit by means of sol-gel process. 
     
     
         14 . The manufacturing method of the heat dissipation unit as claimed in  claim 13 , wherein the sol-gel process is selected from the group consisting of sol-gel dipping process, sol-gel deposition process, sol-gel spin-coating process, sol-gel painting-on process and sol-gel wetting process. 
     
     
         15 . A thermal module comprising:
 an evaporation chamber body having a main chamber, an inlet and an outlet; and   a heat dissipation unit including a metal main body having a chamber and an oxide coating, the oxide coating being coated on wall surface of the chamber, a first end of the heat dissipation unit being connected to the inlet of the evaporation chamber body, while a second end of the heat dissipation unit being connected to the outlet of the evaporation chamber body.   
     
     
         16 . The thermal module as claimed in  claim 15 , wherein the oxide coating coated on the wall surface of the chamber at the second end of the heat dissipation unit is a hydrophobic coating. 
     
     
         17 . The thermal module as claimed in  claim 15 , wherein the oxide coating coated on the wall surface of the chamber at the first end of the heat dissipation unit is a hydrophilic coating. 
     
     
         18 . The thermal module as claimed in  claim 15 , wherein the main chamber has a capillary structure and a working fluid, the main chamber and the capillary structure together defining an evaporation chamber and a condensation chamber.