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Microporous channel type fused salt corrosion resisting boride/diamond composite and preparing method thereof

A technology of microporous channels and composite materials, which is applied in the field of materials, can solve problems that have not yet been seen, and achieve the effects of avoiding corrosion and penetration, reducing costs, and avoiding a large amount of CO2 gas emissions

Active Publication Date: 2019-06-07
JIANGXI SCI & TECH NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no reports of microporous channel-type molten salt corrosion-resistant conductive boride / diamond materials with high reaction area.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) The matrix is ​​cleaned up, placed in a 0.1wt% cetyl sodium sulphate aqueous solution for ultrasonic treatment for 30 minutes, then cleaned with deionized water, and then placed in a 0.5wt% diamond nanocrystal suspension Incubate for 5 minutes, take out after evenly adsorbing nanoparticles, and blow dry with nitrogen;

[0025] (2) The substrate obtained in the previous step is pretreated with plasma hydrogen based on the chemical vapor deposition chamber, and the process parameters are as follows: the temperature is 850°C, and the treatment time is less than 5 minutes. The gas is hydrogen, the flow rate is 100slpm, and the air pressure is 1×10 3 pa, the concentration of atomic hydrogen is 9×10 15 cm 3- .

[0026] (3) The temperature is lowered to 750°C, and then a mixed gas of methane, oxygen, hydrogen and borane is introduced to start chemical vapor deposition of the diamond film. The pressure in the chamber is 5×10 3 pa, the gas source is a flow rate of 200 sl...

Embodiment 2

[0030] Weigh 600 grams of inorganic salt CaCl 2 , put 291 grams of NaCl into a graphite crucible, remove water at 300°C for 48 hours, then add dry tantalum oxide powder, mix evenly, place the crucible in an electrolytic reactor, pass high-purity argon protection, and heat up to 880°C to make the inorganic salt Melt it completely, then keep the furnace temperature at 850°C, take the material prepared in Example 1 as the cathode, apply a constant cell pressure of 2.2V between it and the graphite anode, and perform electrolysis for 2 hours to obtain metal tantalum. After the electrolysis, the cathode was soaked in deionized water and ultrasonically treated to remove the electrolytic products on the surface. It was observed that the material had no corrosion. Under the same conditions, conventional carbon materials are used as cathodes for electrolysis, and the cell voltage needs to be increased to 2.6V.

Embodiment 3

[0032] Weigh 750g NaCl, 5g WO 3 , 150 g Na 2 WO 4 Mix evenly and put it into a graphite crucible. After removing water at 300°C for 48 hours, place the crucible in the electrolytic reactor, pass through high-purity argon for protection, raise the temperature to 800°C to completely melt the inorganic salt, and then keep the furnace temperature at 800°C. Take the example The material prepared in 1 was used as the cathode, and the current density was maintained at 300mA / cm 2 , electrolysis for 2 hours, you can get metal tungsten. After the electrolysis, the cathode was soaked in deionized water and ultrasonically treated to remove the electrolytic products on the surface. It was observed that the material had no corrosion. Compared with conventional carbon material cathodes, the current efficiency is increased by 20%.

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Abstract

The invention discloses a microporous channel type fused salt corrosion resisting boride / diamond composite and a preparing method and application thereof. The composite is composed of a matrix and a function layer; the material structure is stable, inside micropores with the size being 0.5 to 1 mm communicate, the pressure resisting strength is larger than 4 Mpa, the gas hole ratio is larger than60%, the electrical conductivity is larger than 1*10<5>omega<-1>.m<-1>, and acid or alkali, fluoride molten salt and molten metal liquid corrosion can be resisted; the boride / diamond composite is composed of holes which communicate or are closed, and the specific surface area is large; and under the high temperature, the good electrical conductivity, mechanical strength and wear-resistance performance are achieved. The composite is applied to a refractory metal electrolytic reaction, corrosion and penetration of molten salt electrolytes can be avoided, and great emissions of CO2 gas can be avoided.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a microporous channel type molten salt corrosion-resistant boride / diamond composite material and a preparation method and application thereof. Background technique [0002] With the rapid development of the economy, environmental problems are becoming more and more prominent, requiring non-ferrous metal refining to save energy and reduce emissions, control pollution and energy consumption. Green and high-efficiency metallurgy has become the consensus of the industry, and it is also the only way to deal with the current industry development dilemma and the increasing environmental protection requirements. [0003] Refractory metals (such as vanadium, chromium, titanium, etc.) have excellent heat resistance, wear resistance and chemical inertness, and are indispensable metal materials in cutting-edge fields such as aerospace, atomic energy, and medicine. Thermal reduction of m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C7/02C25C3/26C23C16/27
Inventor 刘学璋龙航宇文魁
Owner JIANGXI SCI & TECH NORMAL UNIV
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