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A method of laser additive manufacturing thermal barrier coating material

A thermal barrier coating and laser additive technology, which is applied in the field of additive manufacturing, can solve problems such as loose bonding and failure to achieve metallurgical bonding, and achieve the effects of dense forming structure, good interlayer bonding, and excellent oxidation resistance

Active Publication Date: 2020-11-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Al was prepared by reactive hot pressing sintering 2 o 3 / NiCrAl gradient material, but the boundary between each component of the prepared gradient material is clear, and the metallurgical combination has not been achieved, and the combination is not tight

Method used

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  • A method of laser additive manufacturing thermal barrier coating material
  • A method of laser additive manufacturing thermal barrier coating material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step A, sieve out Al with a particle size of 45-90 μm 2 o 3powder and NiCrAlY powder, and place it in two powder feeding barrels of powder feeder 7 respectively; Adopt Al 2 o 3 The powder and NiCrAlY powder are fed synchronously, and the Al in powder feeder 7 is adjusted. 2 o 3 The powder feeding rate of the powder, so that the Al delivered per unit time 2 o 3 The mass fraction of powder is a=10%;

[0031] Step B, adjust constant process parameters: NiCrAlY powder feeding rate is Q 1 =2g / min, Al 2 o 3 The powder feeding rate is Q 2 =Q 1 ×a / (1-a)=2×10% (1-10%)=0.22g / min, then the total powder feeding rate is Q=Q 1 +Q 2 =2+0.22=2.22g / min; the laser scanning speed is 300mm / min.

[0032] Step C, forming multi-layer multi-layer structure: according to the constant process parameters determined in step B, carry out multi-layer multi-layer structure numerical control programming, and use the scanning method of vertical intersection between layers to perform multi-...

Embodiment 2

[0034] Step A, sieve out Al with a particle size of 45-90 μm 2 o 3 powder and NiCrAlY powder, and place it in two powder feeding barrels of powder feeder 7 respectively; Adopt Al 2 o 3 The powder and NiCrAlY powder are fed synchronously, and the Al in powder feeder 7 is adjusted. 2 o 3 The powder feeding rate of the powder, so that the Al delivered per unit time 2 o 3 The mass fraction of powder is a=20%;

[0035] Step B, adjust constant process parameters: NiCrAlY powder feeding rate is Q 1 =2g / min, Al 2 o 3 The powder feeding rate is Q 2 =Q 1 ×a / (1-a)=2×20% (1-20%)=0.5g / min, then the total powder feeding rate is Q=Q 1 +Q 2 =2+0.5=2.5g / min; the laser scanning speed is 300mm / min.

[0036] Step C, forming multi-layer multi-layer structure: according to the constant process parameters determined in step B, carry out single-layer multi-layer structure numerical control programming, adopt Z-shaped scanning trajectory to perform single-layer multi-layer forming on the ...

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Abstract

The invention provides a method for manufacturing a thermal barrier coating material through laser additives, and belongs to the field of additive manufacturing. The method mainly adopts a laser direct deposition technology to mix Al2O3 of different contents in a NiCrAlY substrate for improving the substrate performance and comprises the main steps that A, the powder feeding rate of a powder feeder is adjusted so that the mass faction range of Al2O3 takes account for the two mixed powder by 5-25%; B, the process condition is adjusted, the powder feeding rate of NiCrAlY at 1.5-2 g / min is determined, and the laser scan speed is adjusted at 100-400 mm / min; and C, the actual forming is conducted, and the process parameters need to be adjusted accordingly during forming different structural parts. The method adopts Al2O3 to improve the NiCrAlY substrate, the wear resistance of the metal substrate is improved, the comprehensive mechanical properties of the metal substrate are improved a certain extent, and the friction coefficient of NiCrAlY is reduced; and in addition, the laser additive manufacturing technology can flexibly control the proportion of the powder compared with a plasma spray method and other methods, the mixed forming of the two powder of different proportions is achieved, the forming tissue is dense, and the interlayer binding force is high.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and relates to a preparation method of a thermal barrier coating material, in particular to a method for laser additive manufacturing of a thermal barrier coating material. Background technique [0002] With the advancement of science and technology, the use environment of parts is becoming more and more diversified, and a single homogeneous material cannot meet the diverse use conditions. As a protective layer on the surface of parts, thermal barrier coating materials can effectively play the role of heat insulation and corrosion resistance, and greatly prolong the service life of parts. [0003] Aircraft engine blades often work in harsh environments such as high temperature, high pressure, and vibration, and are also accompanied by corrosion and wear problems. Wear failure is one of the main forms of engine blade failure. In order to improve the service life of the components, it is nec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10B22F3/105B33Y10/00B33Y30/00B33Y70/10
CPCY02P10/25
Inventor 吴东江刘妮牛方勇马广义余超散俊德
Owner DALIAN UNIV OF TECH