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Technique for preparing titanium diboride (TiB2) coating on metal surface

A technology of metal surface and process method, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., and can solve the problems of poor coating uniformity and difficulty in boride cladding

Active Publication Date: 2016-10-05
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, laser cladding is more suitable for some materials such as self-fluxing alloys, but it is difficult to cladding carbides and borides, and the coating obtained by laser cladding is often poor in uniformity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) The metal substrate is made of commercially available 304L stainless steel, which is cut into sheet substrates of 10mm×10mm×3mm, respectively using 400 and 800 # SiC sandpaper was used for grinding, and cleaned and dried with acetone, and then sandblasted with brown corundum sand for 10 minutes to make the surface lose its metallic luster, and cleaned and dried with acetone;

[0023] (2) Add 200g of TiB 2 The cermet powder is fully mixed with 10 g of dissolved polyvinyl alcohol (PVA), dried and milled for 3 hours in a planetary ball mill at a speed of 450 r / min; # 、200 # Sieve step by step, and finally select TiB with a particle size of 100-200 mesh 2 Powder as spray powder;

[0024] (3) TiB obtained in step (2) 2 The spraying material is pre-prepared TiB on the surface of the metal substrate pretreated in step (1) by the plasma spraying process 2 Coating: The distance between the spray gun and the metal substrate is 100mm, the spraying power is 80kW, the argon...

Embodiment 2

[0028] Step (1), (2), (3) are with embodiment 1;

[0029] (4) Use laser cladding technology to remelt the prefabricated coating obtained in step (3): the cladding power is 80W / mm 2 ; The frequency is 10Hz; the current pulse width is 8μs; the current is 220A; the scan rate is 3mm / s;

[0030] The thickness of the coating obtained in this example is 12 μm. The prepared coating was directly tested for performance without remelting treatment. It was found that after 20 times of thermal shock resistance tests, the coating did not show signs of peeling off, and the coating surface was not damaged. There are obvious changes, but the combination is still firm;

[0031] Using potentiodynamic polarization of H at 0.5 mol / L 2 SO 4 Tested in the solution, it is found that the corrosion potential of the coating is increased by 312mV compared with the substrate, the corrosion rate is significantly reduced, and the corrosion resistance is improved. The TiB directly sprayed in comparative ...

Embodiment 3

[0033] Step (1), (2) are with embodiment 1;

[0034] (3) TiB obtained in step (2) 2 The spraying material is pre-prepared TiB on the surface of the metal substrate pretreated in step (1) by the plasma spraying process 2 Coating: The distance between the spray gun and the metal substrate is 100mm, the spraying power is 80kW, the argon flow rate is 40L / min, the hydrogen flow rate is 15L / min, the powder feeding rate is kept at 28g / min, and the spraying time is 5 minutes;

[0035] (4) Use laser cladding technology to remelt the prefabricated coating obtained in step (3): the cladding power is 80W / mm 2 ; The frequency is 10Hz; the current pulse width is 8μs; the current is 220A; the scan rate is 5mm / s;

[0036] The thickness of the coating obtained in this example is 14 μm. The prepared coating was directly tested for performance without remelting treatment. It was found that after 20 times of thermal shock resistance tests, the coating did not show signs of peeling off, and the ...

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Abstract

The present invention relates to a technique for preparing a titanium diboride (TiB2) coating on a metal surface. In the technique, advantages of a plasma spraying technique and a laser remelting technique are combined, defects such as poor thermal shock resistance and bad compactness of the TiB2 coating obtained by the plasma spraying technique are overcome, and problems that fusion covering of a boride is difficult by a laser fusion covering technique and the coating is large in stress and poor in uniformity are solved. A layer of TiB2 coating is prefabricated on a metal matrix through the laser spraying technique, a porosity factor of the coating is controlled through technological parameters, and then laser remelting treatment is performed on the coating, thus to obtain a dense TiB2 coating in metallurgical bonding with the matrix on the metal surface. With adoption of the obtained TiB2 coating, the surface strength of the metal matrix and the service time of the metal matrix in a corrosive environment can be notably raised.

Description

technical field [0001] The invention belongs to the field of metal coating preparation, in particular to a process method for preparing a titanium boride coating on a metal surface. Background technique [0002] Titanium diboride (TiB 2 ) as a hexagonal metalloid compound, its crystal structure is a two-dimensional network structure composed of boron atomic faces and titanium atomic faces alternately, in which B in the boron atomic face is covalently bonded to the other three B Combined, the extra electron forms a large π bond, endowing TiB 2 Excellent electrical conductivity, and the Ti-B bond between the boron atom face and the titanium atom face determines the TiB 2 The hardness is higher. It is because of TiB 2 Its high conductivity and chemical stability have been widely used in the field of metal surface protection. The usual methods for preparing such cermet coatings include: physical and chemical vapor deposition methods; pulse electrode deposition methods; plas...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/10C23C4/18C23C4/02
CPCC23C4/02C23C4/10C23C4/18
Inventor 潘太军沈杰刘卫
Owner CHANGZHOU UNIV
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