Metal boride coating and preparation method thereof

A metal boride and coating technology, which is applied in the field of metal boride coating and its preparation, can solve the problems of high brittleness, high cost, and poor bonding force of the coating, and achieve improved sintering density, low equipment cost, and improved binding effect

Active Publication Date: 2021-02-12
ANHUI UNIVERSITY OF TECHNOLOGY
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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.

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  • Metal boride coating and preparation method thereof

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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 a 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 metal boride coating and a preparation method thereof. The preparation method comprises the steps that solid inorganic salt is mixed and ball-milled to be micron-sized, metalboride nanoparticles are added into the ball-milled mixed salt, then acetone liquid is added, ultrasonic dispersion is conducted, and solid mixed salt containing the metal boride nanoparticles is obtained after vacuumizing and heating in a vacuum drying box; solid inorganic salt is put into a crucible, and is heated to be fused in a resistance furnace under the protection of inert gas, the solidmixed salt is added into the fused inorganic salt to form nanometer inorganic fused salt, after stabilizing, a graphite anode and a cathode to be deposited are inserted into the crucible, and the metal boride coating can be obtained after electrophoretic deposition. According to the method, the high-temperature environment of the inorganic fused salt is utilized, the two procedures of electrophoretic deposition and sintering of the metal boride nanoparticles in the inorganic fused salt are carried out at the same time, namely electrophoretic deposition and sintering are carried out at the sametime, and therefore the compact metal boride coating with high binding force is obtained.

Description

technical field [0001] The invention relates to the technical field of surface coating preparation, in particular to a metal boride coating and a preparation method thereof. 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 d...

Claims

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Application Information

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Patent Type & Authority Applications(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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