Method for brazing metal ceramic composite coating on titanium alloy surface in vacuum

A metal-ceramic composite and titanium alloy technology, which is applied in the coating process and coating of metal materials, can solve the problems of low bonding strength, low coating thickness, and high porosity of the coating, and achieve smooth and defect-free surfaces. The effect of stability and high bonding strength

Inactive Publication Date: 2015-01-07
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
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Problems solved by technology

However, in order to prepare a coating with high hardness, large thickness, compact structure and high bonding strength with the substrate, the above method still has shortcomings: the coating thickness prepared by vapor deposition and electroplating electroless plating is low, and the bonding strength with the substrate is poor[ Electroplating and Finishing, 2010, 32(10): 15-20]; the coating prepared by thermal spraying has high porosity and low bonding strength with the substrate; surfacing and cladding have a large heat input to the base metal, which is easy to cause The base metal is deformed, and the surface quality of the coating is poor, which is easy to form pores and inclusions
At present, there are no reports of vacuum brazing metal-ceramic composite coatings on the surface of titanium alloys at home and abroad.

Method used

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  • Method for brazing metal ceramic composite coating on titanium alloy surface in vacuum

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Effect test

Embodiment 1

[0018] A method of vacuum brazing metal-ceramic composite coating on the surface of a titanium alloy of this test is carried out in the following steps:

[0019] (1) Surface pretreatment of titanium alloy substrate: Grind the surface of TC4 titanium alloy substrate with sandpaper, then sandblast the surface of the substrate to increase the roughness (quartz sand, particle size 140-260 mesh), and then use acetone, Ultrasonic cleaning was performed with ethanol and deionized water, and then dried in a drying oven at a constant temperature of 50°C for 10 min.

[0020] (2) Powder pretreatment: TiC powder with a particle size of 5 μm and Ti-Zr-Cu-Ni powder with a particle size of 45 μm (the mass ratio of each element is 48%Ti, 27Zr, 18%Cu, 7%Ni) on the planet Mix in a ball mill at a speed of 300r / min for 2h, and the volume fraction of TiC in the ball mill mixture is 50%. Then add ethanol to the mixed powder to prepare a slurry, and then pre-set the slurry evenly and flatly on the ...

Embodiment 2

[0023] A method of vacuum brazing metal-ceramic composite coating on the surface of a titanium alloy of this test is carried out in the following steps:

[0024] (1) Surface pretreatment of titanium alloy substrate: Grind the surface of the TA5 titanium alloy substrate with sandpaper, then sandblast the surface of the substrate to increase the roughness (quartz sand, particle size 140-260 mesh), and then use acetone, Ultrasonic cleaning was performed with ethanol and deionized water to remove residual pollutants, and then dried in a drying oven at a constant temperature of 50°C for 10 minutes.

[0025] (2) Powder pretreatment: WC powder with a particle size of 1 μm and Ti-Zr-Be powder with a particle size of 15 μm (wherein the mass ratio of each element is 46% Ti, 49% Zr, 7% Be) in a planetary ball mill Mix at a speed of 240r / min for 4h, and the volume fraction of WC in the ball-milled mixture is 40%. Add ethanol to the mixed powder to make a slurry, and place the slurry even...

Embodiment 3

[0028] A method of vacuum brazing metal-ceramic composite coating on the surface of a titanium alloy of this test is carried out in the following steps:

[0029] (1) Surface pretreatment of titanium alloy substrate: Grind the surface of TB2 titanium alloy with sandpaper, then sandblast the surface of the substrate to increase the roughness (quartz sand, particle size 140-260 mesh), and then use acetone and ethanol in sequence Ultrasonic cleaning with deionized water was performed to remove residual pollutants, and then dried in a drying oven at a constant temperature of 50°C for 10 minutes.

[0030] (2) Powder pretreatment: ZrC powder with a particle size of 20 μm and Ti-Ni-Nb powder with a particle size of 45 μm (where the mass ratio of each element is 42% Ti, 38% Ni, 20% Nb) was mixed in a horizontal ball mill to Mix at a speed of 150 r / min for 10 h, and the volume fraction of ZrC in the ball-milled mixture is 20%. Add ethanol to the mixed powder to make a slurry, and then ...

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Abstract

The invention relates to a method for brazing a metal ceramic composite coating on a titanium alloy surface in vacuum, belonging to the field of material engineering. The method uses titanium alloy, metal carbide powder and titanium-base alloy powder as raw material. The method comprises the following steps: carrying out base pretreatment to remove oxidation films and oil stains on the base surface and increase the surface roughness of the base; powder mixing and brushing: uniformly mixing the powder raw materials proportionally (the volume percent of metal carbide is 10-60%) to obtain a slurry, and brushing the slurry on the titanium alloy base; and vacuum brazing: putting a test sample into a vacuum furnace, vacuumizing, heating and cooling. The metal ceramic composite coating, which has certain hardness and thickness and is metallurgically bonded with the base, is obtained on the titanium alloy surface, thereby implementing surface modification of the titanium alloy. The method has the advantages of simple technique, stable production process, environment friendliness and low cost, can easily implement industrialization, and has obvious economic, environmental and social benefits.

Description

technical field [0001] The invention provides a method for preparing a metal-ceramic composite coating on the surface of a titanium alloy, which belongs to the field of material engineering, and in particular relates to a method for vacuum-brazing a metal-ceramic composite layer on the surface of a titanium alloy. [0002] Background technique [0003] Titanium alloy is an important alloy developed in the 1950s. It has the advantages of low relative density, high specific strength, good corrosion resistance and excellent biocompatibility. It is widely used in aerospace, metallurgy, chemical industry, Medical and other fields. However, titanium alloys still have some defects, such as low hardness and poor wear resistance, which need to be improved by appropriate surface technology. Especially in the field of aerospace, when titanium alloy components are used in a frictional environment, it is even more necessary to prepare a coating with high hardness, large thickness and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10B22F1/00
CPCC23C24/103
Inventor 黄继华刘晓君陈树海赵兴科
Owner UNIV OF SCI & TECH BEIJING
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