Heat transfer tube having rare-earth oxide superhydrophobic surface and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-11421950-B2
Application number	US-202016733357-A
Country	US
Kind code	B2
Filing date	Jan 3, 2020
Priority date	Nov 14, 2016
Publication date	Aug 23, 2022
Grant date	Aug 23, 2022

Abstract

The present disclosure relates to a heat transfer tube having rare-earth oxide deposited on a surface thereof and a method for manufacturing the same, in which the rare-earth oxide can be deposited on the surface of the heat transfer tube to implement a superhydrophobic surface even under the high temperature environment and a plurality of assembled heat transfer tubes can be coated by coating a complex shape by depositing rare-earth oxide using a method for dipping a surface of the heat transfer tube and coating the same, thereby reducing or preventing the heat transfer tubes from being damaged during the assembling of the heat transfer tubes after the coating.

First claim

What is claimed is:

1. A heat transfer tube made of copper (Cu), the heat transfer tube comprising:
a coating layer formed on a surface of the heat transfer tube as a superhydrophobic surface of the heat transfer tube, the coating layer including a rare-earth oxide,
wherein the coating layer further includes a deposition layer of carbon (C),
wherein the rare-earth oxide is formed using a rare-earth coating solution into which the heat transfer tube is dipped for 20 to 40 minutes, and
wherein the rare-earth coating solution gives a composition of the coating layer of
5.30 wt % of carbon (C),
53.07 wt % of copper (Cu), and
41.63 wt % of an oxide of cerium (Ce), the oxide of cerium (Ce) serving as a substrate for the deposition layer of carbon (C).

2. The heat transfer tube of claim 1 , wherein a thickness of the coating layer without the deposition layer of carbon (C) ranges from 100 to 400 nm.

3. The heat transfer tube of claim 1 ,
wherein the deposition layer of carbon (C) is formed by hydrocarbon contamination of the coating layer without the deposition layer of carbon (C), and
wherein the deposition layer of carbon (C) forms the superhydrophobic surface of the heat transfer tube.

4. The heat transfer tube of claim 3 , wherein the rare-earth oxide of the coating layer includes CeO 2 to which the hydrocarbon contamination is performed.

5. A heat transfer tube made of aluminum (Al), the heat transfer tube comprising:
a coating layer formed on a surface of the heat transfer tube as a superhydrophobic surface of the heat transfer tube, the coating layer including a rare-earth oxide,
wherein the coating layer further includes a deposition layer of carbon (C),
wherein the rare-earth oxide is formed using a rare-earth coating solution into which the heat transfer tube is dipped for 30 to 120 minutes, and
wherein the rare-earth coating solution gives a composition of the coating layer of
12.31 wt % of carbon (C),
26.55 wt % of aluminum (Al), and
61.13 wt % of an oxide of cerium (Ce), the oxide of cerium (Ce) serving as a substrate for the deposition layer of carbon (C).

6. The heat transfer tube of claim 5 , wherein a thickness of the coating layer
without the deposition layer of carbon (C) ranges from 100 to 400 nm.

7. The heat transfer tube of claim 5 ,
wherein the deposition layer of carbon (C) is formed by hydrocarbon contamination of the coating layer without the deposition layer of carbon (C), and
wherein the deposition layer of carbon (C) forms the superhydrophobic surface of the heat transfer tube.

8. The heat transfer tube of claim 7 , wherein the rare-earth oxide of the coating layer includes CeO 2 to which the hydrocarbon contamination is performed.

Assignees

• Doosan Heavy Ind & Construction Co Ltd

Inventors

• Kim Hyun Sik
• Kim Hyun Gee
• Kim Jin Bum
• Nam Young Suk
• Shim Jae Hwan

Classifications

• C23C22/00

  Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals · CPC title

• C01F17/235

  Cerium oxides or hydroxides · CPC title

• F28F2245/04

  hydrophobic · CPC title

• C09D5/00

  Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes · CPC title

• F28F13/182

  especially adapted for evaporator or condenser surfaces (F28F13/187 takes precedence) · CPC title