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Method for preparing metal-tungsten-surface nano porous active layer

A nano-porous, active layer technology, applied in the direction of surface reaction electrolytic coating, nanotechnology, coating, etc., can solve the problems of inability to be popularized and applied in a large range, long preparation cycle, cumbersome process, etc., to shorten the preparation cycle and operate Simple, wide-ranging effects

Inactive Publication Date: 2018-04-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These processes are cumbersome, the preparation period is long, and the cost is high, so they cannot be widely applied.

Method used

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  • Method for preparing metal-tungsten-surface nano porous active layer
  • Method for preparing metal-tungsten-surface nano porous active layer
  • Method for preparing metal-tungsten-surface nano porous active layer

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: a kind of method for preparing nanoporous active layer on metal tungsten surface, the steps are as follows:

[0029] Step 1. Pretreatment of tungsten sheet, including surface grinding, degreasing, ultrasonic cleaning and drying.

[0030] Surface grinding: The surface of the tungsten sheet (purity ≥ 99.95%) with a size of 20×20×0.1mm is polished smooth with 800#, 1000#, 1500# metallographic sandpaper in sequence, and the grinding direction is rotated 90° every time the sandpaper is changed , until the previous grinding trace completely disappears, and finally only the grinding trace of 1500# sandpaper remains on the surface of the tungsten sheet;

[0031] Degreasing: ultrasonically clean the tungsten sheet polished with sandpaper in acetone, isopropanol, and methanol for 10 minutes;

[0032] Ultrasonic cleaning: Ultrasonic cleaning the degreased tungsten sheet in absolute ethanol and ultrapure water for 10 minutes respectively, after cleaning, put it in a ...

Embodiment 2

[0046] Embodiment 2. A method for preparing a nanoporous active layer on the surface of metal tungsten. The steps are basically the same as in Embodiment 1, except that in step 4, the annealing holding time at 700° C. is changed from 3 hours to 2 hours. The average pore size of the nanoporous metal layer on the surface of the finally obtained tungsten sheet is about 77nm, such as Figure 9 shown.

Embodiment 3

[0047] Example 3, a method for preparing a nanoporous active layer on the surface of metal tungsten, the steps are basically the same as in Example 1, the only difference is that in step 4, the annealing temperature is changed from 700°C to 600°C, and the holding time is changed from 3h to 4h . The average pore size of the nanoporous metal layer on the surface of the final tungsten sheet is about 77nm, such as Figure 10 shown.

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Abstract

The invention discloses a method for preparing a metal-tungsten-surface nano porous active layer. The method comprises the steps that the surface of a tungsten sheet undergoes pre-treatment such as polishing, oil removing and cleaning; an electrolyte is prepared by using sodium fluoride and hydrofluoric acid; a platinum sheet is taken as a cathode, the pre-treated tungsten sheet is taken as an anode, the electrodes are immersed in the electrolyte, a certain voltage is applied to carry out anodic oxidation, and a nano porous oxide layer is obtained on the surface of the tungsten sheet; and thetungsten sheet obtained after being cleaned and dried undergoes hydrogen reduction annealing in an annealing furnace, wherein the annealing temperature is 600-700 DEG C, the temperature is kept for 2-4 hours, and then after the tungsten sheet is cooled along with the furnace, the nano porous active layer is obtained on the surface of the metal tungsten. The method has the advantages that the technology process is simple, the repeatability is good, and the cost is low; and the prepared metal-tungsten-surface nano porous active layer has a nanoscale porous structure which is uniform in shape andregular in arrangement, the surface activity of the metal tungsten is greatly improved, meanwhile, the nano porous active layer is still composed of tungsten metal, the surface components are not changed, and the industrial application of the tungsten metal material is facilitated.

Description

technical field [0001] The invention relates to a method for preparing a nanoporous layer on a metal surface, in particular to a method for preparing a nanoporous active layer on a metal tungsten surface. Background technique [0002] Tungsten metal is a high-temperature-resistant material with high melting point, small thermal expansion coefficient, high strength and hardness, strong corrosion resistance and high sputtering threshold. It is widely used in electronics, nuclear power, military and other fields. However, due to the low surface activity of tungsten, it is difficult to react with other metals or solid materials, which limits the application of tungsten materials. Therefore, how to treat the surface of metal tungsten, change the surface state, and improve its surface activity has become a problem that needs to be solved. [0003] Nanoporous metal has both the structure of porous material and the function of nanomaterials, and is a new type of material with funct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26B82Y40/00
Inventor 黄远张洁王祖敏刘永长
Owner TIANJIN UNIV
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