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Method for preparing coating with thermostability and high emissivity on titanium alloy substrate

A high-emissivity, titanium alloy technology, used in coatings, surface reaction electrolytic coatings, electrolytic coatings, etc., can solve the problems of poor thermal shock performance, low bonding force of high-emissivity coatings, and achieve good wear resistance. , easy operation, simple equipment effect

Inactive Publication Date: 2010-06-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low bonding force and poor thermal shock performance of existing high-emissivity coatings on the surface of titanium alloys, and provide a method for preparing high-temperature-resistant high-emissivity coatings on titanium alloy substrates

Method used

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  • Method for preparing coating with thermostability and high emissivity on titanium alloy substrate
  • Method for preparing coating with thermostability and high emissivity on titanium alloy substrate
  • Method for preparing coating with thermostability and high emissivity on titanium alloy substrate

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specific Embodiment approach 1

[0008] Specific embodiment one: the preparation method of the high-temperature-resistant high-emissivity coating on the titanium alloy substrate of the present embodiment is carried out according to the following steps: 1. The surface of the titanium alloy is polished with No. 2000 sandpaper to remove the oxide layer on the surface, and then put into acetone Ultrasonic cleaning for 3 minutes to 10 minutes; 2. The electrolyte is composed of main salt, dispersant, additive and water. The main salt concentration is 5g / L-50g / L, the dispersant concentration is 4g / L-40g / L, 2g / L~20g / L; 3. Place the titanium alloy treated in step 1 in the stainless steel tank body equipped with the colloidal electrolyte prepared in step 2, use the titanium alloy as the anode and the stainless steel tank body as the cathode, and use Powered by a pulsed micro-arc oxidation power supply, the micro-arc oxidation is 10min to 90min under the conditions of a pulse voltage of 350V to 600V, a frequency of 50Hz ...

specific Embodiment approach 2

[0012] Embodiment 2: This embodiment is different from Embodiment 1 in that: the titanium alloy described in step 1 is TC4 or TA15. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the additive described in Step 2 is a powder with a fineness of 20 nm to 40 nm. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for preparing a coating with thermostability and high emissivity on a titanium alloy substrate, relating to a method for preparing a coating on the titanium alloy substrate and solving the problems of low binding force and poor thermal shock performance of a coating with high emissivity on a titanium alloy surface in the prior art. The method comprises the following steps: firstly, grinding and cleaning the titanium alloy; secondly, preparing a major salt, a dispersing agent and an additive into colloid electrolyte; and thirdly, placing the titanium alloy in a stainless steel trough body filled with the electrolyte, and preparing the coating with thermostability and high emissivity on the titanium alloy substrate under the action of a pulse microarc oxidation power supply by using the titanium alloy as an anode and the trough body as a cathode. For the coating prepared by the invention, the emissivity is 0.8-1.0 under the temperature of 700 DEG C, the binding force between the coating and the substrate is good, the tensile strength of the coating is no less than 30 MPa, and the shear strength of the coating is 15 MPa-25 MPa. The coating can not fall off when hot shock circulation is carried out for 100 times under the testing condition that the temperature is 700 DEG C to room temperature, thereby the coating can be used as a thermal protection layer of an outer skin of a hypersonic velocity aerocraft.

Description

technical field [0001] The invention relates to a method for preparing a coating on a titanium alloy substrate. Background technique [0002] During the flight of a hypersonic vehicle, the air around the vehicle undergoes severe aerodynamic heating due to intense compression. If there are no reliable thermal protection measures, the propulsion system of the vehicle, together with other subsystems, such as avionics systems and flight control systems etc. will be exposed to high temperature, which will damage the internal components of the aircraft. Due to its small specific gravity, high strength and high temperature resistance, titanium alloys are increasingly used as outer skins on hypersonic vehicles. However, the surface emissivity of titanium alloy is low, and the heat generated when the aircraft flies at high speed is easy to transfer to the interior of the aircraft, which will damage the electronic devices inside the aircraft. Therefore, it is necessary to prepare a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26
Inventor 孙秋辛铁柱姚忠平唐辉姜兆华王福平
Owner HARBIN INST OF TECH
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