Titanium alloy surface thermal-control wear-resistant coating and preparation method thereof

A titanium alloy, wear-resistant technology, applied in the field of thermal control wear-resistant coating and its preparation, thermal control wear-resistant coating on the surface of titanium alloy and its preparation, can solve the problems of poor hardness and wear resistance

Pending Publication Date: 2022-01-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN106342108B discloses a method for preparing a thermal control coating on the surface of a titanium alloy. An electrolyte containing silicate is used to obtain a low absorption-radiation ratio thermal control coating containing silicon oxide. The silicon oxide in the coating is amorphous State form exists, the coating is loose, and the hardness and wear resistance are poor

Method used

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  • Titanium alloy surface thermal-control wear-resistant coating and preparation method thereof
  • Titanium alloy surface thermal-control wear-resistant coating and preparation method thereof
  • Titanium alloy surface thermal-control wear-resistant coating and preparation method thereof

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Embodiment 1

[0037] Take a titanium alloy test piece with a size of 60×60mm, go through the processes of alkali washing and pickling in sequence, and prepare the electrolyte according to the following mass and volume ratio: sodium aluminate 3g / L, sodium phosphate 10g / L, sodium carbonate 5g / L , the solvent is water. The titanium alloy test piece is placed in the electrolyte and connected to one electrode of the power supply, and the other electrode of the power supply is connected to the stainless steel plate and placed in the electrolyte at the same time. The unidirectional pulse current waveform is adopted, and the frequency of the power supply is 50Hz. During the plasma electrolytic oxidation treatment, the voltage is 490V, and the oxidation current density is 2A / dm 2 , processing time 120min. The resulting thermal control coating has a solar absorption ratio of 0.70, a hemispherical emissivity of 0.86, and a coating hardness of 1100HV.

Embodiment 2

[0039] Take a titanium alloy test piece with a size of 60×60mm, go through the processes of alkali washing and pickling in sequence, and prepare the electrolyte according to the following mass and volume ratio: sodium aluminate 10g / L, sodium tetraborate 10g / L, sodium acetate 5g / L L, the solvent is water. The titanium alloy test piece is placed in the electrolyte and connected to one electrode of the power supply, and the other electrode of the power supply is connected to the stainless steel plate and placed in the electrolyte at the same time. The unidirectional pulse current waveform is adopted, and the frequency of the power supply is 100Hz. During the plasma electrolytic oxidation treatment, the voltage is 510V, and the oxidation current density is 8A / dm 2 , processing time 90min. The solar absorption ratio of the generated thermal control coating is 0.72, the hemispherical emissivity is 0.87, and the hardness of the coating is 1200HV.

Embodiment 3

[0041] Take a titanium alloy test piece with a size of 60×60mm, go through the processes of alkali washing and pickling in sequence, and prepare the electrolyte according to the following mass and volume ratio: sodium aluminate 15g / L, sodium pyrophosphate 15g / L, sodium sulfate 5g / L L, the solvent is water. The titanium alloy test piece is placed in the electrolyte and connected to one electrode of the power supply, and the other electrode of the power supply is connected to the stainless steel plate and placed in the electrolyte at the same time. A single-phase pulse current waveform is adopted, and the frequency of the power supply is 200Hz. During the plasma electrolytic oxidation treatment, the voltage is 520V, and the oxidation current density is 15A / dm 2 , processing time 60min. The solar absorption ratio of the generated thermal control coating is 0.73, the hemispherical emissivity is 0.85, and the microhardness of the coating is 1300HV.

[0042] figure 1 The phase c...

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Abstract

The invention discloses a titanium alloy surface thermal-control wear-resistant coating and a preparation method thereof. The preparation method comprises the steps that a titanium alloy is placed in electrolyte containing aluminate, and in the plasma electrolytic oxidation process, direct-current pulse current is utilized to enable a dielectric film on the surface of the titanium alloy to be broken down, so that plasma micro-arc discharge is generated, and the thermal-control wear-resistant coating on the surface of the titanium alloy grows in situ; and the thermal-control wear-resistant coating is prepared from 40 to 50 weight percent of aluminum titanate, 30 to 40 weight percent of titanium oxide and 10 to 30 weight percent of aluminum oxide.

Description

technical field [0001] The invention relates to a thermal control and wear-resistant coating on the surface of a titanium alloy and a preparation method thereof, in particular to a thermal control and wear-resistant coating for the surface of a space station solar wing titanium alloy movable part and a preparation method thereof, belonging to the thermal control of spacecraft The field of coating technology. Background technique [0002] The density of titanium alloy is about 4.5g / cm 3 , is only 56% of steel, and its strength is 500-1400MPa. Its strength is significantly better than that of aluminum and magnesium alloys, and its high-temperature and low-temperature performance is superior. It has been widely used in aerospace, marine ships, biology, medicine and other fields. application. With the development of my country's space station and deep space exploration technology, titanium alloys are more and more widely used in large structures such as solar wings and antenna...

Claims

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Application Information

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IPC IPC(8): C25D11/26
CPCC25D11/26C25D11/024C25D11/026
Inventor 辛世刚黄卿乐军宋力昕焦海洋李国敏周敏剑
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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