Preparing method for high-solar-energy-absorption-rate and high-emissivity black matt film on surface of titanium alloy

A high-emissivity, titanium alloy technology, applied in the direction of surface reaction electrolytic coatings, coatings, electrolytic coatings, etc., can solve the problems of low bonding force between the film layer and the substrate, low emissivity, and low solar absorption rate, and achieve Excellent binding force and thermal stability, high absorption rate, simple process effect

Active Publication Date: 2015-12-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems that existing coatings on the surface of titanium alloys have low solar energy absorption rate, low self-emission rate, an...

Method used

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  • Preparing method for high-solar-energy-absorption-rate and high-emissivity black matt film on surface of titanium alloy
  • Preparing method for high-solar-energy-absorption-rate and high-emissivity black matt film on surface of titanium alloy

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specific Embodiment approach 2

[0036] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the film-forming agent described in step two is trisodium phosphate, sodium metasilicate, sodium polyphosphate, sodium hexametaphosphate, sodium tungstate , disodium edetate and ammonium metavanadate. Others are the same as the first embodiment.

specific Embodiment approach 3

[0037] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the additive described in step 2 is one of ferrous sulfate, nickel acetate and cobalt acetate or a mixture of several of them. Other steps are the same as those in Embodiment 1 or 2.

specific Embodiment approach 4

[0038]Embodiment 4: The difference between this embodiment and Embodiments 1 to 3 is that in step 2, the processed titanium alloy is placed in the electrolyte in stainless steel, and the processed titanium alloy 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, at a constant voltage of 350V, a power frequency of 500Hz, a duty cycle of 30%, and an electrolyte temperature of 25°C and React for 10 minutes under the condition that the pH value of the electrolyte is 12, and obtain a black matte film layer with high solar energy absorption rate and high emissivity on the surface of the titanium alloy. Other steps are the same as those in Embodiments 1 to 3.

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Abstract

The invention discloses a preparing method for a high-solar-energy-absorption-rate and high-emissivity black matt film on the surface of a titanium alloy, and relates to a preparing method for a ceramic film on the surface of the titanium alloy. The preparing method aims at solving the problems of the low solar energy absorption rate, the low emissivity and the low film and base-body binding force of an existing coating on the surface of the titanium alloy. The preparing method includes the steps of 1, carrying out titanium alloy pre-processing; and 2, carrying out micro-arc oxidation, and obtaining the high-solar-energy-absorption-rate and high-emissivity black matt film on the surface of the titanium alloy. As for the high-solar-energy-absorption-rate and high-emissivity black matt film, prepared with the preparing method, on the surface of the titanium alloy, the thickness ranges from 20 microns to 30 microns, the roughness ranges from 0.5 micron to 3 microns, the solar energy absorption rate ranges from 0.95 to 0.98, and the emissivity ranges from 0.93 to 0.97. The preparing method is used for preparing the high-solar-energy-absorption-rate and high-emissivity black matt film on the surface of the titanium alloy.

Description

technical field [0001] The invention relates to a method for preparing a ceramic film layer on the surface of a titanium alloy. Background technique [0002] With the development of science and technology, the requirements for metal materials in various fields are getting higher and higher, and the specific strength of titanium alloy is high. Titanium alloy TA7 (Ti-5Al-2.5Sn) has good thermoplasticity and can be welded in various forms. Good, the strength and plasticity of the welded joint can be equal to that of the base metal. It has good corrosion resistance and good thermal stability at high temperature. It can be used as structural parts for long-term work below 500 °C, and can be used as various die forgings. Good low-temperature performance: Titanium alloy TA7 with extremely low interstitial elements can still maintain its mechanical properties at low and ultra-low temperatures, and can maintain a certain degree of plasticity at -253°C. Therefore, titanium alloy TA7...

Claims

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Application Information

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IPC IPC(8): C25D11/26
Inventor 姜兆华魏晗刘冠杰姚忠平李东琦夏琦兴
Owner HARBIN INST OF TECH
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