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Preparation method of high density cold spraying metal/metal-based sedimentary body and application thereof

A cold spraying, metal-based technology, applied in the field of material processing, can solve the problems of easy-to-oxidize metal coating surface oxidation, particle quality, spray gun clogging, etc., to achieve superior electrical conductivity, high corrosion resistance, and high wear resistance.

Active Publication Date: 2015-09-09
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Significantly increasing the speed of particles is usually expensive helium (about N 2 40 times) as the accelerating gas; increasing the temperature of the particles is usually achieved by significantly increasing the temperature of the accelerating gas, and the heating of the deposited coating exposed to the air by the higher temperature airflow will cause oxidation on the surface of the easily oxidizable metal coating , which seriously affects the quality of interparticle bonding
In addition, the higher particle temperature will cause clogging of the spray gun for some low melting point metals, alloys and some nickel-based superalloys such as Al, Mg, Zn, etc., which seriously affects the process performance of cold spraying.

Method used

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  • Preparation method of high density cold spraying metal/metal-based sedimentary body and application thereof
  • Preparation method of high density cold spraying metal/metal-based sedimentary body and application thereof
  • Preparation method of high density cold spraying metal/metal-based sedimentary body and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Before spraying, the surface of the substrate is roughened by sand blasting, and Ti with a particle size distribution of 10-31 μm is selected. 6 Al 4 V alloy powder is used as the deposition material powder, and 316 stainless steel shot peening particles with an average particle size of 203 microns are added and mixed mechanically, and the volume of the shot peening particles accounts for 20-70% of the total volume of the mixed powder. The above mixed powder was used as the spray powder, nitrogen was used as the accelerating gas, and the coating was deposited by cold spraying under the spraying conditions of the gas temperature of 550°C and the gas pressure of 2.8MPa. The cross-sectional structure of the coating when the shot peening particles are 70vol% is as follows: figure 2 As shown in b, under the same conditions without adding shot peening particles, the cross-sectional structure of the deposited coating is as follows figure 2 as shown in a. By comparison, it...

Embodiment 2

[0037]Before spraying, the surface of the substrate is roughened by sand blasting. The IN718 nickel-based superalloy powder with a particle size distribution of 10-45 μm is selected as the deposition material powder, and spherical 410 martensitic stainless steel shot blasting particles with a particle size distribution of 150-200 μm are added. , mechanical mixing, the volume of shot peening particles accounts for 20-70% of the total volume of the mixed powder. The above mixed powder is used as the spray powder, nitrogen is used as the accelerating gas, and the deposition body coating is cold sprayed under the spraying conditions of the gas temperature of 650° C. and the gas pressure of 2.8 MPa. The cross-sectional structure of the coating when the shot peening particle content is 50vol% is as follows: image 3 As shown in b, under the same conditions without adding shot peening particles, the cross-sectional structure of the deposited coating is as follows image 3 as shown i...

Embodiment 3

[0039] Before spraying, the surface of the substrate is roughened by sandblasting, and the nanocrystalline NiCrAl alloy powder with a particle size distribution of 15-45 μm prepared by mechanical alloying is selected as the deposition material powder, and 20-50vol.% is mixed into the spraying powder, with an average particle size of 180μm 410 martensitic stainless steel shot peening particles. The above mixed powder is used as the spray powder, nitrogen is used as the accelerating gas, and the deposited body coating is cold sprayed under the spraying conditions of the gas temperature of 600° C. and the gas pressure of 3.1 MPa. The cross-sectional structure of the coating when the shot peening particle content is 50vol% is as follows: Figure 4 As shown in b, under the same conditions without adding shot peening particles, the cross-sectional structure of the deposited coating is as follows Figure 4 as shown in a. By comparison, it can be found that after adding shot peening...

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Abstract

The invention discloses a preparation method of a high density cold spraying metal / metal-based sedimentary body and an application thereof, which belongs to the technical field of material processing. The method comprises the following steps: 1)taking ceramic particles, cermet particles, fine metal or an alloy as shot blast particles; taking fine metal with a single component, the alloy, metal and a metal-based composite material, or, taking a mixture of two or more than two of fine metal, the alloy or an intermetallic compound as deposition material powder; and 2)employing a cold spraying technology for spraying a mixture of the shot blast particles and the deposition material powder on the surface of the matrix to prepare the high density cold spraying metal / metal-based sedimentary body. According to the method, obvious increasing of particle speed and deposition temperature is not required, operation is simple, the deposition body has more excellent conductivity, thermal conductivity, higher corrosion resistance, wear resistance and higher mechanical property, so that the deposition body can be used for preparing the coating with high conductivity, high heat conduction, high corrosion resistance and high wear resistance as well as high mechanical property workpiece.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a preparation method and application of a high-density cold-sprayed metal / metal-based deposit body. Background technique [0002] Cold spraying is a method that uses high-speed gas to accelerate micron-scale particles (~5-75μm) at relatively low temperatures (<1000°C), causing them to hit the substrate at high speed (~300-1200m / s) in a completely solid state. The process of material deposition is achieved by severe plastic deformation at the interface between particles and the substrate. The lower gas temperature can avoid thermal effects such as oxidation, phase transformation, and grain growth in the powder in the conventional thermal spraying process. At the same time, a higher particle velocity helps the particles to undergo sufficient plastic deformation during the deposition process to obtain a densely organized deposit. These characteristics ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08
Inventor 李长久雒晓涛杨冠军
Owner XI AN JIAOTONG UNIV
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