Laser cladding metal/ceramic composite coating and preparation technology thereof

A laser cladding and ceramic composite technology, which is applied in metal material coating technology, laser welding equipment, metal processing equipment, etc. Large and other problems, to achieve the effect of improving hardness and wear resistance, not easy to float and sink, and good high temperature performance

Active Publication Date: 2013-11-27
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the scanning speed is too slow, the preset coating material will be burned and the surface roughness will increase
The scanning speed is too fast, the laser energy is insufficient, the coating material is not completely melted, and the coating cannot be formed

Method used

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  • Laser cladding metal/ceramic composite coating and preparation technology thereof
  • Laser cladding metal/ceramic composite coating and preparation technology thereof
  • Laser cladding metal/ceramic composite coating and preparation technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] With Q235 as the base material, the volume fraction of the cladding material used is 50% of Ni35 alloy powder and 50% of large particle NbC. (The volume is calculated by dividing its powder mass by its density)

[0046] 1) Mix the cladding materials evenly in proportion, adjust the mixed powder into a paste with water glass dilution solution, and evenly apply it on the surface of the cleaned sample, control its thickness to 1.2-1.5mm, and dry it;

[0047] 2) Scan the sample with a continuous laser, keep the spot diameter at 4mm, power at 3kW, scan speed at 5mm / s for laser cladding, and protect with side blowing argon.

[0048] The structure observation, hardness and wear resistance analysis of the prepared cladding layer were carried out.

[0049] Observe the microstructure morphology in the middle of the cladding layer, such as Figure 5 As shown, there are both unmelted bulk NbC and precipitated NbC in the cladding layer. The distribution of NbC is relatively uneven...

Embodiment 2

[0055] With Q235 as the base material, the volume fraction of the cladding material used is 70% of Ni35 alloy powder and 30% of large particle NbC.

[0056] 1) Mix the cladding materials evenly in proportion, adjust the mixed powder into a paste with water glass dilution solution, and evenly apply it on the surface of the cleaned sample, control its thickness to 1.2-1.5mm, and dry it;

[0057] 2) Scan the sample with a continuous laser, keep the spot diameter at 4mm, power at 3kW, scan speed at 5mm / s for laser cladding, and protect with side blowing argon.

[0058] The structure observation, hardness and wear resistance analysis of the prepared cladding layer were carried out.

[0059] Observe the microstructure morphology in the middle of the cladding layer, such as Figure 5 As shown, there are both unmelted bulk NbC and precipitated NbC in the cladding layer, and the distribution of the two in the cladding layer is relatively uniform as Figure 5 (c) (d) shown.

[0060] ...

Embodiment 3

[0063] With Q235 as the base material, the volume fraction of the cladding material used is 30% of Ni35 alloy powder and 70% of large particle NbC.

[0064] 1) Mix the cladding materials evenly in proportion, dilute the mixed powder into a paste with water glass dilution solution and apply it evenly on the cleaning surface

[0065] After the sample surface, control its thickness to 1.2 ~ 1.5mm, and dry it;

[0066] 2) Scan the sample with a continuous laser, keep the spot diameter at 4mm, power at 3kW, scan speed at 5mm / s for laser cladding, and protect with side blowing argon.

[0067] The structure observation, hardness and wear resistance analysis of the prepared cladding layer were carried out.

[0068] Observe the microstructure morphology in the middle of the cladding layer, such as Figure 5 As shown, there are a large amount of unmelted bulk NbC in the cladding layer, and a small amount of precipitated NbC, such as Figure 5 (e) (f) shown.

[0069] The hardness dis...

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Abstract

The invention relates to a laser cladding metal / ceramic composite coating and a preparation technology thereof. The laser cladding metal / ceramic composite coating is prepared by carrying out laser cladding on steel as a matrix material as well as Ni35 nickel base alloy powder and large particle niobium carbide NbC as a cladding material, wherein the cladding material is prepared from the components in percentage by weight: 20-80 percent of the Ni35 nickel base alloy powder and 80-20 percent of the large particle niobium carbide NbC. With the adoption of the laser cladding metal / ceramic composite coating, the surface of a cladding layer is smoother without cracks, and the cladding layer is better in the quality of overlap joint, is strong in the rigidity, is smaller in friction coefficient and can bear stronger stress; and a wear mechanism mainly adopts microcosmic spalling together with slight ploughing wear, and shows good anti-dry sliding friction wear resistance.

Description

technical field [0001] The invention relates to a laser cladding cermet composite coating, which belongs to the technical field of composite materials. Background technique [0002] Laser cladding is the use of high-energy laser beams to heat the surface of the material, melting the pre-coated or transported coating material and a thin layer on the surface of the substrate together to form a tiny molten pool and rapidly solidifying, forming a metal substrate on the surface of the metal substrate. Cladding layer with excellent performance and metallurgical bonding with the substrate. Due to the fast melting speed and the thin melting layer of the substrate, the dilution rate is low, and a cladding layer whose composition is basically the same as that of the coating can be obtained. The characteristics of laser cladding are: the cooling rate is extremely fast, the structure of the cladding layer is fine, the solid solution speed of alloying elements increases, and even metast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B23K26/34
Inventor 于慧君陈传忠贺挺
Owner SHANDONG UNIV
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