Preparation method of low-solar-absorptance high-emissivity coating on surface of titanium alloy TC4

A technology of solar absorptivity and high emissivity, applied in surface reaction electrolytic coatings, coatings, electrolytic coatings, etc., can solve the problems of weak bonding between the coating and the substrate, difficulty in obtaining a uniform coating, and high solar absorptivity , to achieve the effect of good thermal stability, strong binding force and high emissivity

Active Publication Date: 2014-08-27
HARBIN INST OF TECH
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of high solar absorptivity, low emissivity, and high cost in the titanium alloy thermal control coating prepared by the existing method. In order to solve the problem of weak bonding, a method for preparing a coating with low solar absorptivity and high emissivity on the surface of titanium alloy TC4 is provided

Method used

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  • Preparation method of low-solar-absorptance high-emissivity coating on surface of titanium alloy TC4
  • Preparation method of low-solar-absorptance high-emissivity coating on surface of titanium alloy TC4
  • Preparation method of low-solar-absorptance high-emissivity coating on surface of titanium alloy TC4

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specific Embodiment approach 1

[0021] Embodiment 1: This embodiment is a preparation method of a low solar absorptivity and high emissivity coating on the surface of titanium alloy TC4, which is specifically completed according to the following steps:

[0022] 1. Pretreatment of titanium alloy TC4: First, use 60# dry sandpaper, 240# water sandpaper and 400# water sandpaper to polish the titanium alloy TC4, then use NaOH solution to remove the oil on the surface of the titanium alloy TC4, and then clean it with distilled water , blow it dry with a hair dryer to obtain the treated titanium alloy TC4;

[0023] The NaOH solution described in the step 1 is formed by mixing NaOH and distilled water, and the volume ratio of the mass of the NaOH to the distilled water is (8g~10g): 1L;

[0024] 2. Micro-arc oxidation: The treated titanium alloy TC4 is placed in the electrolyte of stainless steel, and the titanium alloy TC4 is connected to the positive electrode of the power supply as an anode, and the stainless stee...

specific Embodiment approach 2

[0034] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the volume ratio of the mass of NaOH described in step one to distilled water is 10g:1L. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0035] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that in step two, the treated titanium alloy TC4 is placed in the electrolyte of stainless steel, and the titanium alloy TC4 is connected to the positive pole of the power supply as The anode, the stainless steel electrolytic cell is connected to the negative pole of the power supply as the cathode; the pulse micro-arc oxidation power supply is used for power supply, and the current density is 8A / dm 2 ~14A / dm 2 , The power frequency is 100Hz-500Hz, the duty cycle is 20%-45%, the temperature of the electrolyte is 20°C-40°C and the pH value of the electrolyte is 0.54-1, and the micro-arc oxidation reaction is 3min-4.5min. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of a low-solar-absorptance high-emissivity coating on the surface of titanium alloy TC4, relates to a preparation method of a ceramic film layer on the surface of the titanium alloy TC4, and aims at solving the problems that a titanium alloy thermal control coating prepared by adopting an existing method is high in solar absorptance, low in emissivity and high in cost, a uniform coating is difficultly obtained for the surface with a complicated shape, a process is complicated and the bonding degree between the coating and a matrix body is poor. The preparation method comprises the following steps: 1, pre-processing the titanium alloy TC4; and 2, performing micro-arc oxidation. The coating prepared by adopting the method has the roughness of 4.056 microns to 13.66 microns and the thickness of 68.1 microns to 200 microns, and the thickness of the coating is adjustable; due to in-situ growth, the bonding degree is good; the emissivity of a film layer under process conditions of a highly acidic zirconate system is more than 0.96, and the absorption rate is less than 0.32.

Description

technical field [0001] The invention relates to a preparation method of a ceramic film layer on the surface of titanium alloy TC4. Background technique [0002] Titanium alloy TC4 has good comprehensive properties, such as good structural stability, good toughness, good plasticity and excellent corrosion resistance, and has gradually become a manufacturing material for spacecraft, aircraft and missiles. However, during the actual space flight of space vehicles (such as satellites, spaceships, and lunar rovers), there is a problem that the temperature on the sunny side is higher, and the temperature on the back side is lower, and the environmental temperature change experienced can be as high as hundreds of degrees. To ensure the normal operation and work of internal equipment and instruments, a thermal control system is essential. Thermal control coatings are one of the most widely used protective materials in thermal control systems. It adjusts the thermal balance inside ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
Inventor 姚忠平沈巧香胡冰姜兆华
Owner HARBIN INST OF TECH
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