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Preparing method of carbon nano tube array composite film and heat exchanger

A carbon nanotube array, composite membrane technology, applied in heat exchange equipment, lighting and heating equipment, gaseous chemical plating and other directions, can solve the problems of easy frosting and easy condensation of heat exchanger fins

Active Publication Date: 2016-04-06
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Based on this, it is necessary to solve the problem that the fins of the heater are easy to condense when cooling and frost when heating at low temperature. The purpose of the present invention is to provide a method for preparing a carbon nanotube array composite film and a heat exchanger. The prepared carbon nanotube array composite film has high temperature and low temperature resistance, corrosion resistance, thermal conductivity and super hydrophobicity, so that the fins of the heat exchanger are not easy to condense when the unit is cooling, and it is not easy to frost when heating. Thermal performance is improved, resulting in enhanced unit operating performance

Method used

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  • Preparing method of carbon nano tube array composite film and heat exchanger

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preparation example Construction

[0022] refer to figure 1 , the method for preparing a carbon nanotube array composite film according to an embodiment of the present invention, the carbon nanotube array composite film includes a carbon nanotube array, a parylene coating and an aluminum sheet, and the aluminum sheet can be a processed fin, It can also be used as raw material for processing heat exchanger fins. The preparation method comprises the following steps:

[0023] S1, put the single crystal silicon (100) substrate into the vacuum chemical vapor deposition equipment, and sequentially deposit Al on the single crystal silicon (100) substrate 2 o 3 The thin film and Fe thin film are used as the catalyst, and the mixed gas of hydrogen and argon is used as the protective gas of the catalyst; among them, Al 2 o 3 The thickness of the thin film is 30-45nm, and the thickness of the Fe thin film is 1.2-1.5nm.

[0024] S2, heat the vacuum chemical vapor deposition equipment to 830-850°C, feed ethylene gas wi...

Embodiment 1

[0033] The preparation method of carbon nanotube array composite membrane comprises the following steps:

[0034] S1, put the single crystal silicon (100) substrate into the vacuum chemical vapor deposition equipment, and sequentially deposit Al on the single crystal silicon (100) substrate 2 o 3The thin film and Fe thin film are used as the catalyst, and the mixed gas of hydrogen and argon is used as the protective gas of the catalyst; among them, Al 2 o 3 The thickness of the thin film was 40 nm, and the thickness of the Fe thin film was 1.4 nm.

[0035] S2, heat the vacuum chemical vapor deposition equipment to 840°C, feed ethylene gas with a flow rate of 100sccm as the carbon source, the feeding time of ethylene gas is 15s, feed water as a weak oxidant, the concentration of water in the vacuum chemical vapor deposition equipment When ethylene gas is thermally decomposed, a carbon nanotube array is grown under the action of a catalyst, and the growth height of the carbon...

Embodiment 2

[0042] The preparation method of the carbon nanotube array composite film is as follows:

[0043] S1, put the single crystal silicon (100) substrate into the vacuum chemical vapor deposition equipment, and sequentially deposit Al on the single crystal silicon (100) substrate 2 o 3 The thin film and Fe thin film are used as the catalyst, and the mixed gas of hydrogen and argon is used as the protective gas of the catalyst; among them, Al 2 o 3 The thickness of the thin film was 30 nm, and the thickness of the Fe thin film was 1.2 nm.

[0044] S2, heat the vacuum chemical vapor deposition equipment to 830°C, feed ethylene gas with a flow rate of 80sccm as a carbon source, the feeding time of ethylene gas is 10s, feed water as a weak oxidant, the concentration of water in the vacuum chemical vapor deposition equipment When ethylene gas is thermally decomposed, a carbon nanotube array is grown under the action of a catalyst, wherein the growth height of the carbon nanotube arra...

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Abstract

The invention provides a preparing method of a carbon nano tube array composite film and a heat exchanger. The method comprises the following steps that S1, an Al2O3 film and a Fe film are sequentially deposited on a substrate of monocrystalline silicon (100) to serve as catalysts; S2, vacuum chemical vapor deposition equipment is heated to 830 DEG C to 850 DEG C, ethylene gas is led in to serve as a carbon source, and a carbon nano tube array grows under assistance of water; S3, paracyclophane is deposited on the surface of the nano tube array in a vapor manner to form an even composite film; S4, the composite film is transferred to an aluminum sheet from the substrate of the monocrystalline silicon (100), paracyclophane is deposited on the surface of the composite film in a vapor manner, and a composite film is bonded on the aluminum sheet; and S5, a paracyclophane coating on the surface of the composite film is etched to form the carbon nano tube array composite film. The prepared carbon nano tube array composite film has high temperature and low temperature resistance, corrosion resistance, heat conduction and super hydrophobicity, and therefore when a unit carries out refrigeration, heat exchanger fins are not prone to condensation; and during heating, frosting is not prone to happening, the heat exchange performance of the heat exchanger is improved, and therefore the running performance of the unit is improved.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a method for preparing a carbon nanotube array composite film and a heat exchanger. Background technique [0002] Generally speaking, the fins of the heat exchanger are made of aluminum sheet and hydrophilic or hydrophobic coating. When the air conditioner is cooling, the indoor unit is prone to condensed water; when heating in winter, the outdoor temperature is low, because the surface temperature of the heat exchanger is lower than 5.8 ℃, the fins of the external unit are likely to have condensed water, resulting in frosting of the heat exchanger, poor heat transfer effect, and reduced unit performance. Contents of the invention [0003] Based on this, it is necessary to solve the problem that the fins of the heater are easy to condense when cooling and frost when heating at low temperature. The purpose of the present invention is to provide a method for preparing a car...

Claims

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Application Information

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IPC IPC(8): C23C16/40C23C16/06C23C16/26C23C16/56F28F3/00F28F19/02
CPCC23C16/06C23C16/26C23C16/403C23C16/56F28F3/00F28F19/02F28F2245/04
Inventor 梁尤轩赵桓谭锋李鹏飞沈军
Owner GREE ELECTRIC APPLIANCES INC
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