A metal-ceramic composite arc spraying flux-cored welding wire

一种金属陶瓷、电弧喷涂的技术，应用在金属加工设备、焊接设备、焊接介质等方向，能够解决不具备性能等问题，达到好力学性能、气孔率降低、致密性提高的效果

Active Publication Date: 2022-04-26
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to adapt to harsh and working conditions and the operating performance of equipment, supersonic arc spraying coatings are required to have the following characteristics: the coating has good compactness, and the porosity is less than 1%; the bonding strength is high, and the bonding strength between the coating and the boiler pipe matrix Greater than 40Mpa; the coating has high hardness, the coating hardness HRC is greater than 60, and has excellent high temperature wear resistance at 850°C; the coating has good corrosion resistance, and it can withstand high temperature corrosive gases at 850°C (HC14ml / L+SO 2 0.5ml / L) excellent corrosion resistance; however, the existing metal-ceramic arc sprayed flux-cored wire does not have the above-mentioned excellent properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Metal-ceramic arc spraying flux-cored wire, including metal-ceramic powder and sheath, according to the weight percentage of the sheath: C: 0.7-0.8%, Mn: 0.8-1.2%, Si: 0.4-0.8%, Cr: 12-14 %, Mo: 0.8-1%, Nb: 0.8-1%, Al 0.4-0.8%, B: 0.8-2%, the balance is Fe; the powder is based on the weight percentage of the welding wire: TiC: 25-34%, Cr 3 C 2 : 23-32%, Al 2 o 3 : 7-10%, boride: 5-8%, NiCrAl: 2-3%, Y 2 o 3 : 0.1-5%, potassium silicate: 1-4%.

[0057] The process parameters of arc spraying are: arc voltage 24V, working current 250A, compressed air pressure 0.6MPa, spraying distance 150mm.

[0058] Obtain the welding sample of the coating and the substrate, and the bonding strength between the coating and the substrate is 43Mpa, the porosity is 0.93%, and the high temperature wear resistance test results at 850°C are: the wear loss weight is 112.21mg, at 850°C In the high temperature corrosive gas, no corrosion phenomenon was found.

Embodiment 2

[0060] Cermet type arc spraying flux-cored welding wire, including cermet type powder and sheath, according to the weight percentage of the sheath: C: 0.7-0.8%, Mn: 0.8-1.2%, Si 0.4-0.8%, Cr: 12-14% , Mo: 0.8-1%, Nb: 0.8-1%, Al 0.4-0.8%, B: 0.8-2%, the balance is Fe; the powder is according to its weight percentage: TiC: 27-34%, Cr 3 C 2 : 23-30%, Al 2 o 3 : 7-8%, Boride: 6-8%, NiCrAl: 2-3%, Y 2 o 3 : 0.1-5%, potassium silicate: 1-3%.

[0061] The process parameters of arc spraying are: arc voltage 24V, working current 250A, compressed air pressure 0.6MPa, spraying distance 150mm.

[0062] Obtain the welding sample of the coating and the substrate. The bonding strength between the coating and the substrate is 44.6Mpa, the porosity is 0.86%, and the high temperature wear resistance test results at 850°C are: the wear loss weight is 120.34mg, at 850°C In the high temperature corrosive gas, no corrosion phenomenon was found.

Embodiment 3

[0064] Cermet type arc spraying flux-cored welding wire, including cermet type powder and sheath, according to the weight percentage of the sheath: C: 0.7-0.8%, Mn: 0.8-1.2%, Si 0.4-0.8%, Cr: 12-14% , Mo: 0.8-1%, Nb: 0.8-1%, Al 0.4-0.8%, B: 0.8-2%, the balance is Fe; its powder content is: TiC: 25-30%, Cr 3 C 2 : 25-32%, Al 2 o 3 : 8-10%, boride: 5-6%, NiCrAl: 2-3%, Y 2 o 3 : 0.1-5%, potassium silicate: 1-3%.

[0065] The process parameters of arc spraying are: arc voltage 24V, working current 250A, compressed air pressure 0.6MPa, spraying distance 150mm.

[0066] Obtain the welding sample of the coating and the substrate. The bonding strength between the coating and the substrate is 45.3Mpa, the porosity is 0.89%, and the high temperature wear resistance test results at 850°C are: the wear loss weight is 125.27mg, at 850°C In the high temperature corrosive gas, no corrosion phenomenon was found.

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Abstract

The invention provides a metal-ceramic composite arc-spraying flux-cored wire. The arc-spraying flux-cored wire in the invention is a metal-ceramic wire made of metal or alloy as a binding phase and ceramic particles as a reinforced hard phase. , the present invention organically combines the properties of metal's strength, toughness, electrical conductivity and thermal conductivity with the high hardness, high chemical stability and other properties of ceramic materials, giving full play to the comprehensive advantages of the two major engineering materials; at the same time, due to the addition of metal components, The bonding strength between the cermet coating and the base material is increased, the cohesive strength between the ceramic particles of the coating is increased, the porosity of the coating is reduced, and the density is improved, so that the coating has better performance than pure ceramic coating. The mechanical properties can be adapted to the high power station boilers, especially the circulating fluidized bed boilers.

Description

[0001] Original application number: 2018112470627 [0002] Date of original filing: October 24, 2018 [0003] Applicant of the original case: Dongguan Institute of Technology [0004] The name of the original application: a metal-ceramic arc sprayed flux-cored welding wire. technical field [0005] The invention relates to a cermet composite arc spraying flux-cored welding wire, in particular to an arc spraying flux-cored welding wire for boiler pipes. Background technique [0006] The arc spraying technology was pioneered by the Swiss in the 1920s. It was mainly used in the decoration industry at first. Later, the Japanese and Germans successively invented AC power supply and DC power supply spraying equipment, so that arc spraying can be used in the repair of old equipment and steel structures. The anti-corrosion has been practically applied; because the flux-cored wire is easy to draw, the production process is simple, and the composition is easy to adjust, it has uniqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/368
CPCB23K35/0266B23K35/3086B23K35/3601B23K35/368
Inventor 张文涛
Owner DONGGUAN UNIV OF TECH
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