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Material used for improving performances of high-temperature resistant, abrasion and antifriction of surface of titanium alloy and application thereof

A high-temperature wear-resistant, titanium alloy technology, applied in metal material coating process, coating and other directions, can solve the problems of surface hardness and high-temperature wear resistance of a single titanium alloy, the coating is easy to peel off, and it does not reduce friction. Achieve the effects of excellent macroscopic mechanical properties, dense coating structure and cost saving

Inactive Publication Date: 2013-04-17
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Traditional composite coating materials only improve the hardness and high-temperature wear resistance of the titanium alloy surface, but in many cases, it intensifies the wear of the counterpart, so that only the wear resistance is obtained, but it does not play a role in reducing friction. , however, adding some solid lubricants can effectively improve this drawback of traditional composite materials
The coatings prepared by plasma spraying and other processes have the following disadvantages: the coating structure is loose, there are more pores and slag inclusions; the mechanical combination with the substrate is mainly low, and the bonding strength is low, especially under impact loads. Coating is easy to peel off

Method used

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  • Material used for improving performances of high-temperature resistant, abrasion and antifriction of surface of titanium alloy and application thereof
  • Material used for improving performances of high-temperature resistant, abrasion and antifriction of surface of titanium alloy and application thereof
  • Material used for improving performances of high-temperature resistant, abrasion and antifriction of surface of titanium alloy and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Mix the powder according to the following weight percentage: nickel (Ni): 15%, chromium (Cr): 12%, chromium carbide (Cr 3 C 2 ): 43%, tungsten disulfide (WS 2 ): 30%. The alloy powder mixture is obtained by mechanical mixing, and the powder particle size reaches 200-300 mesh.

[0025] 2. Dissolving methyl cellulose in ether as a binder, blending with the powder mixture, coating on the surface of titanium alloy (Ti-6Al-4V) to form a coating, and baking to dry.

[0026] 3. Irradiate the pre-laying coating with a laser with a power of 1.5 kW, while blowing inert gas to the molten pool to avoid oxidation of the surface of the molten pool; the laser uses CO 2 Laser, the rectangular spot size is 6 mm × 3 mm, and the laser scanning speed is 4 mm / s.

[0027] 4. According to the size of the titanium alloy (Ti-6Al-4V) substrate, a continuous coating can be obtained by single-pass laser scanning or multi-pass laser scanning.

Embodiment 2

[0029] 1. Mix the powder according to the following weight percentage: nickel (Ni): 15%, chromium (Cr): 12%, chromium carbide (Cr 3 C 2 ): 43%, tungsten disulfide (WS 2 ): 30%. The alloy powder mixture is obtained by mechanical mixing, and the powder particle size reaches 200-300 mesh.

[0030] 2. Use ethanol to dissolve 2123 phenolic resin material as an adhesive. The 2123 phenolic resin is a solid phenolic resin formed by polycondensation of phenol and formaldehyde under the action of an acidic catalyst. Blend the adhesive with the powder mixture, apply it on the surface of the titanium alloy (Ti-6Al-4V) as a coating, and bake it to dry.

[0031] 3. Irradiate the pre-laying coating with a laser with a power of 1.5 kW, while blowing inert gas to the molten pool to avoid oxidation of the surface of the molten pool; the laser uses CO 2 Laser, the rectangular spot size is 6 mm × 3 mm, and the laser scanning speed is 4 mm / s.

[0032] 4. According to the size of the titanium ...

Embodiment 3

[0034] 1. Mix the powder according to the following weight percentage: nickel (Ni): 15%, chromium (Cr): 12%, chromium carbide (Cr 3 C 2 ): 43%, tungsten disulfide (WS 2 ): 30%. The alloy powder mixture is obtained by mechanical mixing, and the powder particle size reaches 200-300 mesh.

[0035] 2. Use ether to dissolve methyl cellulose as a binder, blend it with the powder mixture, apply it on the surface of titanium alloy (Ti-6Al-4V) to form a coating, and bake it to dry.

[0036]3. Irradiate the pre-laying coating with a laser with a power of 1.5 kW, while blowing inert gas to the molten pool to avoid oxidation of the surface of the molten pool; the laser uses CO 2 Laser, the circular spot diameter is 3 mm, and the laser scanning speed is 4 mm / s.

[0037] 4. According to the size of the titanium alloy (Ti-6Al-4V) substrate, a continuous coating can be obtained by single-pass laser scanning or multi-pass laser scanning.

[0038] See attached figure 1 , it is NiCr / Cr 3 ...

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Abstract

The invention relates to a material used for improving performances of high-temperature resistant, abrasion and antifriction of surface of titanium alloy and application thereof. The material which is composition of alloy powder is composed of, by mass percent, 14% to 17.5% of nickel, 10% to 14.5% of chromium, 42.5% to 45.5% of chromium carbide and 25 % - 30% of tungsten disulfide. The material which uses NiCr-Cr3C2 composite powder as metallic matrix and WS2 as solid lubrication utilizes the technology of laser cladding for preparing solid self-lubricating high-temperature resistable abrasion resistable and antifriction composite coating on surface of Ti-6Al-4V alloy with the composite powder, hardness of the surface of the titanium alloy can be effectively improved, and surface friction coefficient of the titanium alloy can be reduced, so that the performances of high temperature and abrasion resistant of the titanium alloy can be enhanced and the application range of the titanium alloy can be broadened.

Description

technical field [0001] The invention relates to a material for improving the high-temperature wear-resisting and friction-reducing properties of the titanium alloy surface and its application. Background technique [0002] Titanium alloy (Ti-6Al-4V) has outstanding advantages such as low density, high specific strength, high yield ratio, excellent high-temperature mechanical properties (compared with aluminum alloys), excellent corrosion resistance, and good biocompatibility. , Aerospace, ships, weapons, marine, petroleum, chemical, biomedical engineering and other fields are widely used. However, the shortcomings of titanium alloys such as large friction coefficient, easy adhesion, difficulty in lubrication, poor wear resistance, and low high-temperature oxidation resistance greatly limit the application range of titanium alloys, especially seriously restricting the use of titanium alloys as friction pair moving parts. [0003] Since friction and wear basically occur on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C29/00C23C24/10
Inventor 刘秀波孟祥军刘海青郑晨王明娣孙承峰
Owner SUZHOU UNIV
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