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Laser cladding method for titanium alloy

A technology of laser cladding and titanium alloy, which is applied in the coating process and coating of metal materials, can solve the problems of reducing the cracking sensitivity of the coating and not having universality, so as to eliminate the cracking sensitivity and reduce the residual stress , The effect of less pores and cracks

Inactive Publication Date: 2016-09-14
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although controlling the composition of the cladding material and optimizing the process parameters can effectively reduce the cracking sensitivity of the coating, the selected cladding material and process can only correspond to specific materials and are not universal

Method used

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  • Laser cladding method for titanium alloy
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  • Laser cladding method for titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] a) The composition of the cladding material is selected, and the nickel-based alloy powder and carbide ceramic composition are designed as shown in Table 1:

[0045] Table 1 Nickel-based alloy powder and carbide ceramic components

[0046] NiCCrBSi(wt.%)

B 4 C(wt.%)

90

10

[0047] b) The design of preheating and holding time, four different preheating processes are designed, as shown in Table 2:

[0048] Table 2 Different preheating processes

[0049] Group design

Preheating temperature (℃)

Holding time (min)

I

25

30

II

400

30

III

600

30

IV

800

30

[0050] c) The preparation process of the composite coating composed of this component and different preheating processes includes the following steps:

[0051] (1) Weigh the nickel-based alloy powder and the carbide ceramic powder in the above-mentioned mass ratio, stir and grind the powder fully to form a uniform mixed powder;

[0052] (2) Using an improved pre-coating method on the titanium alloy Ti6Al4V substrate, through ...

Embodiment 2

[0064] A laser cladding method for titanium alloy, including the following steps:

[0065] (1) Grind the nickel-based alloy and carbide ceramics into powders and stir and mix to obtain the mixed powder, ready for use; wherein the nickel-based alloy contains the following elements by weight, Ni 70%, C 5%, Cr 20%, B 4%, Si 1%; carbide ceramic is B 4 C, the mass ratio of nickel-based alloy to carbide ceramic is 3:7;

[0066] (2) Brush a layer of polyvinyl alcohol with a mass fraction of 3% on the titanium alloy Ti6Al4V substrate, and then add the mixed powder obtained in step (1), and press the tablet under the tablet machine to form a pre-coating, wherein the tablet machine The applied pressure is 40MPa, the holding time is 1min, and the thickness of the formed pre-coating is 0.5mm;

[0067] (3) Put the titanium alloy Ti6Al4V substrate containing the pre-coated layer in a well-type resistance furnace and heat it to 100°C. After keeping it for 30 minutes, perform laser cladding at 100°...

Embodiment 3

[0070] A laser cladding method for titanium alloy, including the following steps:

[0071] (1) Grind the nickel-based alloy and carbide ceramics into powders and stir and mix to obtain the mixed powder, ready for use; wherein the nickel-based alloy contains the following elements by weight, Ni 80%, C 0.1%, Cr 10%, B 5%, Si 4.9%; carbide ceramic is B 4 C, the mass ratio of nickel-based alloy to carbide ceramic is 95:5;

[0072] (2) Brush a layer of polyvinyl alcohol with a mass fraction of 10% on the titanium alloy Ti6Al4V substrate, and then add the mixed powder obtained in step (1), press the tablet under the tablet machine to form a pre-coating, wherein the tablet machine The applied pressure is 20MPa, the holding time is 5min, and the thickness of the formed pre-coating is 1mm;

[0073] (3) Put the titanium alloy Ti6Al4V substrate containing the pre-coated layer in a well-type resistance furnace and heat it to 800°C. After holding for 10 minutes, perform laser cladding at 800°C. ...

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Abstract

The invention relates to a laser cladding method for a titanium alloy. The laser cladding method includes the following steps that firstly, a nickel-based alloy and carbide ceramics are ground into powder and then stirred and mixed, and mixed powder is obtained for standby application; secondly, a titanium alloy Ti6Al4V substrate is coated with a layer of bonding agent, then the mixed powder obtained in the first step is added, tabletting is conducted, and a preset coating is formed; and thirdly, the titanium alloy Ti6Al4V substrate containing the preset coating is heated to 100 DEG C to 800 DEG C, the temperature is kept for 10 min to 30 min, then laser cladding is conducted under the condition that the temperature is not changed, and the titanium alloy which has the low cracking sensibility and is coated with the coating is obtained. Compared with the prior art, the manufactured composite coating is uniform in structure and has the lower cracking sensibility. The laser cladding method can be applied to modification of titanium alloy parts serving on aerospace vehicles and navigation ships under the wear working condition and anti-acid pumps and anti-acid valve titanium alloy components.

Description

Technical field [0001] The present invention relates to, in particular to a Background technique [0002] Titanium alloys have the advantages of high specific strength and excellent corrosion resistance and are widely used in aerospace, petrochemical, medical and other industrial fields. However, due to its low surface hardness and wear resistance, its application is severely restricted. Therefore, improving the surface hardness and wear resistance of titanium alloys has become a research hotspot. [0003] A large number of studies have shown that surface modification technology can significantly increase the surface hardness of titanium alloys, thereby improving their wear resistance. Traditional surface modification techniques include ion implantation, ion carburizing, boronizing, nitriding and thermal spraying. The ion implantation method is difficult to obtain a relatively strong metal ion beam, and the depth of strengthening the material surface is low. Ion carburizing, bo...

Claims

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Application Information

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IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 陶阳锋李军吕英豪胡列锋
Owner SHANGHAI UNIV OF ENG SCI
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