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Cold spraying welding method used for improving strength of dissimilar metal joints and based on interface pinning effect

A technology of dissimilar metal and joint strength, applied in metal material coating process, heating inorganic powder coating, coating and other directions, can solve the problem of limited interface bonding strength, improve mechanical and physical and chemical properties, increase bonding force, The effect of high deposition rate

Inactive Publication Date: 2017-05-31
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the interfacial bonding strength is still limited for direct joining of dissimilar metals by cold spraying.

Method used

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  • Cold spraying welding method used for improving strength of dissimilar metal joints and based on interface pinning effect
  • Cold spraying welding method used for improving strength of dissimilar metal joints and based on interface pinning effect
  • Cold spraying welding method used for improving strength of dissimilar metal joints and based on interface pinning effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] see figure 1 with figure 2 As shown, 50mm×40mm×8mm pure copper plate 1 and pure aluminum plate 2 are selected, the composite powder B is 70vol% pure copper powder with a diameter d50 of about 200 microns, 15vol% pure aluminum powder with a diameter d50 of about 50 microns and 15vol % pure copper powder with diameter d50 of about 50 microns, composite powder A is composed of 70vol% pure copper powder with diameter d50 of about 45 microns and 30vol% pure aluminum powder with diameter d50 of about 50 microns. Use 100-mesh quartz sand on the groove surface and sandblast the pressure at 6 atm; adjust the axial direction of the spray gun to be parallel to the surface normal of the pure aluminum plate 2 and the pure copper plate 1 to be connected, and spray composite powder B to form a composite coating of about 150 microns. Layer 3, such as figure 1 As shown; then adjust the spray gun axis to be perpendicular to the horizontal surface of the pure aluminum plate 2 and the p...

Embodiment 2

[0038] see image 3 with Figure 4 As shown, 50mm×100mm×3mm pure copper plate 1 and pure aluminum plate 2 are selected, the composite powder B is 30vol% pure copper powder with a diameter d50 of about 200 microns, 35vol% pure aluminum powder with a diameter d50 of about 50 microns and 35vol% pure copper powder with diameter d50 of about 50 microns, composite powder A is composed of 80vol% pure copper composite with diameter d50 of about 45 microns and 20vol% pure aluminum composite with diameter d50 of about 50 microns. Use 100-mesh quartz sand on the groove surface and sandblast the pressure at 6 atm; adjust the axial direction of the spray gun to be parallel to the surface normal of the pure aluminum plate 2 and the pure copper plate 1 to be connected, and spray composite powder B to form a composite coating of about 150 microns. Layer 3, such as image 3As shown; then adjust the axial direction of the spray gun and the pure aluminum plate 2 at an angle of 60° to spray the...

Embodiment 3

[0040] see Figure 5 with Image 6 As shown, a pure copper rod 11 and a pure aluminum rod 12 with a diameter of 5 mm and a length of 50 are selected, the composite powder B is 60vol% pure copper powder with a diameter d50 of about 200 microns, and 20 vol% with a diameter d50 of about 50 microns Pure aluminum powder and 20vol% pure copper powder with diameter d50 of about 50 microns, composite powder A is composed of 90vol% pure copper powder with diameter d50 of about 45 microns and 10vol% pure aluminum powder with diameter d50 of about 50 microns. Use 100-mesh quartz sand on the groove surface and sandblast the pressure at 6 atm; adjust the axial direction of the spray gun to be parallel to the surface normal of the pure copper rod 11 and the pure aluminum rod 12 to be connected, and spray composite powder B to form a 150-micron Composite coating3, such as Figure 5 Shown; Then adjust the axial direction of the spray gun to be perpendicular to the axis of the pure copper ro...

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Abstract

The invention discloses a cold spraying welding method used for improving the strength of dissimilar metal joints and based on the interface pinning effect, and the cold spraying welding method is used for connecting of a first metal and a second metal, wherein the first metal is fine copper, and the second metal is fine aluminum. The cold spraying welding method specifically comprises the following steps that (1), the groove surfaces of the first metal and the second metal are subjected to pre-treatment; (2), cold spraying is conducted through composite powder B, and a composite coating layer is formed in each of the groove surfaces of the first metal and the second metal; and (3), cold spraying is conducted through composite powder A, grooves of the first metal and the second metal are filled to form sedimentary bodies, and thus connecting of the first metal and the second metal is achieved. According to the cold spraying welding method used for improving the strength of the dissimilar metal joints and based on the interface pinning effect, through spraying of the composite layers which have a certain thickness, the pinning effect and the interface reinforcing effect, then the sedimentary bodies are formed through cold spraying and connected with the dissimilar metal joints with a certain groove, and finally a connecting body with high combined strength is obtained; connecting of the aluminum and the copper which are complex in structure can be achieved, the interface combined strength is high, the temperature in the connecting process is low, and oxidation and a new phase are not fundamentally generated.

Description

technical field [0001] The invention relates to the field of heterogeneous metal connection, in particular to a cold spray welding method for enhancing the strength of Al / Cu heterogeneous metal joints. Background technique [0002] In modern industrial production, materials with different properties need to be welded into composite parts, in order to meet various performance requirements, save valuable materials and reduce production costs. Copper and its alloys have excellent electrical and thermal conductivity, corrosion resistance and low-temperature plasticity, but copper and its alloys are rare metals in my country and are expensive. Aluminum and its alloys have the characteristics of low density, high strength, corrosion resistance, high thermal conductivity and electrical conductivity, and good processing performance. The weight, save precious metal materials, and can play their respective performance advantages to achieve a balance between cost and performance. At ...

Claims

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Application Information

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IPC IPC(8): C23C24/08
CPCC23C24/087
Inventor 李成新付斯林谭香张林杰雒晓涛杨冠军李长久
Owner XI AN JIAOTONG UNIV
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