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Preparation method of black rhenium coating

A technology of coating and molten salt, which is applied in the field of molten salt electroplating preparation of high-emissivity black rhenium coating, can solve the problems of high cost, difficulty in ensuring uniform coating thickness of components, and slow deposition speed, etc., and achieves convenient operation, The coating thickness is easy to control and the concentration is convenient

Active Publication Date: 2019-05-17
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional CVD technology has a slow deposition rate and high cost, and it is difficult to ensure the uniformity of the coating thickness at each position of the component when preparing components with complex shapes.

Method used

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  • Preparation method of black rhenium coating
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  • Preparation method of black rhenium coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of preparation method of black rhenium coating, technological process is such as figure 1 shown, including the following steps:

[0038] (1) Molten salt chlorination:

[0039]In the process of preparing molten salt, such as figure 2 The shown molten salt chlorination device, the molten salt chlorination device comprises a quartz barrel 14, a quartz cup 15, two air inlet pipes and an air outlet pipe; the quartz cup 15 is arranged in the quartz barrel 14, and the top of the quartz barrel 14 is provided with There is a rubber plug 16 for sealing, and the air inlet pipe and the air outlet pipe pass through the rubber plug 16. One of the air inlet pipes is used for introducing chlorine gas, and the other air inlet pipe is used for introducing argon gas. When the quartz cup 15 is filled with molten salt, the inlet pipe for chlorine gas is inserted into the molten salt.

[0040] Weigh the CsCl and place it in an oven at 200 °C for 24 h to remove the crystal water. ...

Embodiment 2

[0050] A method for preparing a black rhenium coating is basically the same as the steps in Example 1, except that the plating temperature in step (3) is 850°C.

[0051] Figure 7 and Figure 8 The surface of the black rhenium coating prepared in this example and the microscopic topography of the fracture are respectively, it can be seen from the figure that the surface of the coating is smooth and gray-black. The grain size of the coating is larger than that of Example 1, the surface is densely packed with spire tower-shaped grains with a grain size less than 10 μm, and the coating thickness is about 40 μm. According to the national standard GB 5210-85 "Determination of Coating Adhesion - Pull-off method", the pull-off test was carried out. The average tensile strength measured was 12.2MPa, and the breaking point was the joint between the coating and the substrate. The surface emissivity of the Rhenium coating at room temperature is 0.7.

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Abstract

The invention discloses a method for preparing a black rhenium coating, which comprises the following steps: S1, molten salt chlorination: under the protection of an inert gas, after heating CsCl to a molten state, adding K 2 ReCl 6 , get K 2 ReCl 6 Molten salt, to the K 2 ReCl 6 Chlorine gas is passed into the molten salt for chlorination, and the chlorinated molten salt is obtained after cooling; S2, electroplating: under the protection of an inert gas, the chlorinated molten salt obtained in step S1 is heated to a molten state, and the substrate of the plated piece is immersed in In the chlorinated molten salt in the molten state, the chlorinated molten salt in the molten state is used as the plating solution, the substrate of the plated piece is used as the cathode, and the inert electrode is used as the anode. Rhenium coating. The preparation method of the invention has low cost and fast deposition speed, and the prepared black rhenium coating has good uniformity.

Description

technical field [0001] The invention belongs to the technical field of molten salt electrochemistry and surface coating, and relates to a preparation method of a black rhenium coating, in particular to a molten salt electroplating preparation method of a high emissivity black rhenium coating. Background technique [0002] Rhenium is a rare refractory metal with high melting point (3180°C), high modulus, excellent high temperature mechanical properties and thermal shock resistance, these properties make rhenium especially suitable for working at ultra-high temperature and strong thermal shock used in the environment. In addition, metal rhenium also has very good wear resistance and corrosion resistance. The wear resistance of rhenium is second only to metal osmium (Os), and it can maintain relatively good chemical inertness for most gases except oxygen. At present, rhenium is mainly used in high-temperature structures and energy systems (such as space missile propulsion syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/66C25D5/00C25D17/00
CPCC25D3/66C25D5/003C25D17/004
Inventor 朱利安叶益聪白书欣张虹白宏德王江帆黄永乐
Owner NAT UNIV OF DEFENSE TECH
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