A kind of preparation method of metal boride coating

A metal boride, coating technology

Active Publication Date: 2021-09-24
ANHUI UNIVERSITY OF TECHNOLOGY
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AI Technical Summary

Problems solved by technology

The vapor deposition method can control the density and purity of the coating, and obtain a high-purity coating with a dense structure. Its main disadvantages are low deposition efficiency, high brittleness of the coating, and large equipment investment; The thickness is large, but due to the limitation of its own process, the obtained metal boride coating generally has low density, high porosity, and has a secondary oxidation phase, which reduces the corrosion resistance and conductivity of the coating, etc.; The boride itself has a high melting point, and it is difficult to form a dense boride coating by laser cladding
[0004] At present, the preparation of metal boride coatings still has problems such as high cost, poor density, high brittleness, and poor adhesion, which greatly limit the wide application of metal boride coatings.

Method used

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  • A kind of preparation method of metal boride coating
  • A kind of preparation method of metal boride coating
  • A kind of preparation method of metal boride coating

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preparation example Construction

[0026] The preparation method of the metal boride coating of the present invention comprises the following steps:

[0027] S1, preparing a solid mixed salt containing metal boride nanoparticles;

[0028] Mixing a certain proportion of solid inorganic salts, ball milling to micron level, adding metal boride nanoparticles to the ball milled mixed salt, the amount of metal boride nanoparticles added is 30% to 50% of the total weight of the mixed salt, Then add acetone liquid and ultrasonically disperse for 1-2.5 hours, vacuumize and heat in a vacuum drying oven, the heating temperature is 70°C-180°C, the vacuum degree is 30-150 Pa, and after vacuum heating treatment time is 0.5-2.5 hours, you can get Solid mixed salts containing metal boride nanoparticles.

[0029] S2, preparation of metal boride coating by electrophoretic deposition in nano-inorganic molten salt;

[0030] Put a certain proportion of solid inorganic salt into the crucible, heat to melt in an inert gas-protected...

Embodiment 1

[0038] NaF and AlF in a molar ratio of 3:2 3 Mix well, put into planetary ball mill and ball mill to micron level. In ball-milled NaF and AlF3 mixed salt, add zirconium diboride with an average particle diameter of 70 nanometers, and the weight of nano zirconium diboride is NaF and AlF 3 35% of the total weight of the mixed salt, then add acetone liquid and ultrasonically disperse for 1.5 hours, then put it into a vacuum oven for heating, the heating temperature is 150 ° C, and the vacuum degree is 100 Pa. After 1.8 hours of vacuum heat treatment, the acetone is completely volatilized to obtain di Solid-state NaF and AlF with uniform distribution of zirconium boride nanoparticles 3 Mixed salt; NaF and AlF in a molar ratio of 3:2 3 Inorganic salts were mixed and added to the graphite crucible, and under the protection of high-purity argon, they were melted in a resistance furnace at a temperature of 950°C. After complete melting, the zirconium diboride nanoparticles NaF and A...

Embodiment 2

[0040]Thoroughly mix NaCl and KCl with a molar ratio of 1:1, and put them into a planetary ball mill for ball milling to micron level. Add titanium diboride with an average particle size of 50 nanometers in the ball-milled NaCl and KCl mixed salt, the weight of nano-titanium diboride is 45% of the total weight of NaCl and KCl mixed salt, then add acetone liquid and ultrasonically disperse for 2 hours, and then placed in a vacuum oven for heating at a temperature of 130°C and a vacuum of 120 Pa. After 1.5 hours of vacuum heat treatment, the acetone was completely volatilized to obtain a solid NaCl and KCl mixed salt with titanium diboride nanoparticles evenly distributed. NaCl, KCl and AlCl with a molar ratio of 17:17:66 3 Inorganic salts were mixed and added to a quartz crucible, and under the protection of high-purity argon, they were melted in a resistance furnace at a temperature of 710°C. After complete melting, the NaCl and KCl containing titanium diboride nanoparticles p...

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Abstract

The invention discloses a method for preparing a metal boride coating, which comprises the steps of: mixing solid inorganic salts, ball milling to micron level, adding metal boride nanoparticles to the ball-milled mixed salt, adding acetone liquid and ultrasonically dispersing it. , after vacuuming and heating in a vacuum drying box, a solid mixed salt containing metal boride nanoparticles is obtained; the solid inorganic salt is put into a crucible, heated to melting in a resistance furnace protected by an inert gas, and the solid mixed salt is added to melt In the inorganic salt, nano-inorganic molten salt is formed. After stabilization, the graphite anode and the cathode to be deposited are inserted into the crucible, and after electrophoretic deposition, the metal boride coating can be obtained; the invention utilizes the high temperature environment of the inorganic molten salt to realize the inorganic molten salt. Electrophoretic deposition and sintering of metal boride nanoparticles in salt are carried out simultaneously, that is, "sintering while electrophoretic deposition", so as to obtain a dense and strong metal boride coating.

Description

technical field [0001] The invention relates to the technical field of surface coating preparation, in particular to a preparation method of a metal boride coating. Background technique [0002] Metal borides have the characteristics of high melting point, high hardness, strong acid resistance, high temperature oxidation resistance, liquid metal corrosion resistance, and good electrical and thermal conductivity, which make metal borides have great application advantages in many harsh environments. Surface coatings for molten metal crucibles, cutting knives, wear-resistant parts, EDM electrodes, electrical equipment, armor materials, rocket nozzles, hydrogen fuel cell bipolar plates, and solar absorbing parts. [0003] At present, the main preparation methods of metal boride coatings include vapor deposition (chemical vapor deposition and physical vapor deposition), thermal spraying (plasma spraying, supersonic flame spraying, etc.), laser cladding, etc. The vapor deposition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D13/02
CPCC25D13/02
Inventor 肖赛君金维亮寇倩丁德胜钟聪葛纯涛章俊崔颖
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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