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Molten salt electroforming preparation method of rhenium

A technology of molten salt and electroforming, which is applied in the direction of electroforming and electrolysis, which can solve problems such as difficulties, inability to heat process rhenium, complex processing, etc., and achieve the effects of convenient operation, good compactness, and good thickness uniformity

Active Publication Date: 2018-02-16
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, rhenium is very sensitive to oxygen (hot brittle), and it is easy to generate RexO with a low melting point on the grain boundary of rhenium when subjected to thermal processing, so rhenium cannot be thermally processed
Rhenium is mostly used in thin-walled components with complex shapes (engine combustion chambers, nozzles, etc.) in the aerospace field, which makes the processing of rhenium very complicated and difficult

Method used

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  • Molten salt electroforming preparation method of rhenium
  • Molten salt electroforming preparation method of rhenium
  • Molten salt electroforming preparation method of rhenium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of molten salt electroforming preparation method of rhenium, technological process is as follows image 3 shown, including the following steps:

[0040] (1) Molten salt chlorination:

[0041] Weigh NaCl, KCl and CsCl respectively according to the raw material percentage of 34.7: 44.2: 21.1, then place the above raw materials in an oven at 200°C for 24 hours to remove crystal water, grind and mix them and put them in figure 1 In the quartz cup of the molten salt chlorination device shown, the device was purged with argon three times, and heated to 750°C under an argon protective atmosphere to melt. Stir the molten salt and add a certain amount of K to the molten salt 2 ReCl 6 , so that containing K 2 ReCl 6 The concentration of rhenium ions in the molten salt is 5wt.%, chlorine gas is passed into the molten salt for 30 minutes of chlorination, and finally cooled under the protection of argon to obtain the chlorinated molten salt.

[0042] (2) Yin and anodic ...

Embodiment 2

[0051] A preparation method of molten salt electroforming of rhenium, the steps of which are basically the same as in Example 1, the only difference being that the electroforming time of step (3) is 12 hours.

[0052] Figure 7 The macrophotograph of the combustion chamber component of the 200N engine obtained in this example shows that the surface of the component is relatively smooth, silver-gray, and has nodules locally. Figure 8 The metallographic photograph of the cross-section of the component shows that there is no obvious hole in the cross-section of the component, and the compactness is good. The density measured by the drainage method is 99.4% of the theoretical density, the thickness of the component (that is, the rhenium layer) is about 600 μm, and the current efficiency is 94%.

Embodiment 3

[0054] A preparation method of molten salt electroforming of rhenium, the steps of which are basically the same as in Example 1, the only difference is that the cathode in step (2) is the mandrel of the combustion chamber of a 25N engine, and the contour shape of the inner wall of the anode basket is designed to be the same as that of the The profile of the mandrel is matched to form the pictorial anode; the electroforming time of step (3) is 22 hours.

[0055] Figure 9 The macrophotograph of the 25N engine combustion chamber component obtained for this embodiment, as can be seen from the figure, the surface of the component is silver-gray with nodules locally. Figure 10 It is a macroscopic photo of the component after EDM cutting and surface mechanical grinding. It can be seen that the surface of the component is bright and dense after being mechanically polished. After removing the graphite mandrel, the density of the rhenium component measured by the drainage method is 9...

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Abstract

The invention discloses a molten salt electroforming preparation method of rhenium. The method comprises the following steps: S1, molten salt chlorination: under protection of inert gas, heating a molten salt medium to a molten state, adding K2ReCl6 to obtain molten salt containing K2ReCl6, introducing chlorine into the molten salt containing K2ReCl6 for chlorination, and cooling the molten salt to obtain the chloridized molten salt; and S2, electroforming: under protection of inert gas, heating the chloridized molten salt in S1 to the molten state, immersing a core mold into the chloridized molten salt in the molten state, and performing electrifying to carry out electroforming to obtain a rhenium metal casting on the surface of the core mold by taking the chloridized molten salt in the molten state as an electrolyte, the core mold as a cathode and an inert electrode carrying rhenium as an anode. The preparation method disclosed by the invention is low in cost and high in efficiency and can prepare the rhenium casting which is good in uniformity and compactness, and the casting is easy to demold.

Description

technical field [0001] The invention belongs to the fields of molten salt electrochemistry and refractory metal preparation, and in particular relates to a preparation method of rhenium molten salt electroforming. Background technique [0002] Rhenium (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 environment using [J.A. Biaglow. High temperature rhenium material properties. Ohio: NASA, 1998]. 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 to most gases except oxygen. At present, rhenium is mainly used in high-temperature structures and energy systems (such as space missile propulsion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D1/00
CPCC25D1/00
Inventor 朱利安叶益聪白书欣张虹王江帆黄永乐白宏德
Owner NAT UNIV OF DEFENSE TECH
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