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Preparation method for titanium alloy TiAl3-Al composite coating

A composite coating, titanium alloy technology, applied in the direction of metal material coating process, coating, melting spray plating, etc., to achieve the effect of controllable coating thickness, high production efficiency and low cost

Inactive Publication Date: 2016-03-16
GUANGDONG INST OF NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • Preparation method for titanium alloy TiAl3-Al composite coating
  • Preparation method for titanium alloy TiAl3-Al composite coating
  • Preparation method for titanium alloy TiAl3-Al composite coating

Examples

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Embodiment 1

[0026] (1) Powder pretreatment: the particle size is 15~120μm TiAl 3 The powder and pure Al powder with a particle size of 10-100μm are mechanically mixed at a weight ratio of 92:8 for 24h, put in a 50℃ oven for 5h, and then taken out for use.

[0027] (2) Pre-treatment of TC4 titanium alloy substrate: the burrs on the surface of the TC4 titanium alloy substrate are polished with sandpaper, ultrasonically cleaned with alcohol for 10 minutes, and then sandblasted on the surface of the TC4 titanium alloy substrate, and ultrasonically cleaned with alcohol for 5 minutes.

[0028] (3) Low-temperature supersonic flame spray coating: TiAl 3 The mixed powder of powder and pure Al powder is thermal spray powder, and TiAl is prepared on the surface of titanium alloy substrate using low-temperature supersonic flame spray equipment 3 -Al coating. The process parameters are: the combustion chamber pressure is 1.8MPa, the powder feeding carrier gas is nitrogen, the flow rate is 9l / min, the spray ...

Embodiment 2

[0032] (1) Powder pretreatment: the particle size is 15~120μm TiAl 3 The powder and pure Al powder with a particle size of 10-100μm are mechanically mixed in a weight ratio of 80:20 for 24 hours, put in an oven at 40°C for 6 hours, and then taken out for use.

[0033] (2) Pretreatment of the TC11 titanium alloy substrate: sand the surface of the TC11 titanium alloy with sandpaper to remove the surface burrs, ultrasonically clean the surface with alcohol for 10 minutes, and then sandblast the surface of the TC11 titanium alloy with alcohol for 5 minutes.

[0034] (3) Cold spray coating: TiAl 3 The mixed powder of powder and pure Al powder is thermal spray powder, and the cold spray technology prepares TiAl on the surface of TC11 titanium alloy substrate. 3 -Al coating. The process parameters are: the gas used is nitrogen, the preheating temperature is 550°C, the pressure is 2.5MPa, the spray gun moving speed is 100mm / s, and the spraying distance is 30mm.

[0035] This example TiAl 3 -...

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Abstract

The invention relates to a preparation method for a titanium alloy TiAl3-Al composite coating. The preparation method is characterized by comprising the following steps: (1) TiAl3 powder and pure Al powder are mixed in proportion, and baking is carried out after 24 hours; (2) burrs on the titanium alloy surface are polished with abrasive paper, ethyl alcohol is used for ultrasonic cleaning, sand blasting is carried out on the surface of a titanium alloy, and ultrasonic cleaning with the ethyl alcohol lasts for 5 min to 20 min; and (3) the TiAl3-Al composite coating is prepared on the surface of a titanium alloy base material with a low-temperature high velocity oxy-fuel method or a cold spraying method. By means of the preparation method for the titanium alloy TiAl3-Al composite coating, the antioxygenic property of the titanium alloy can be greatly improved through the coating; the low-temperature high velocity oxy-fuel technology or the cold spraying technology is adopted in the preparation method; and the method is easy and convenient to operate and easy to control, and the quality of the formed coating is good.

Description

Technical field [0001] The invention relates to a titanium alloy TiAl 3 -Al composite coating preparation method, belonging to the field of surface technology, using thermal spraying method to prepare TiAl 3 -Al protective coating. Background technique [0002] Titanium alloy is an important structural metal developed in the 1950s. It has excellent physical and mechanical properties, such as low density, high specific strength, and corrosion resistance. It has been widely used in aviation, aerospace, petroleum, and chemical industries. , Metallurgy and other fields. But at the same time, titanium alloys also have certain shortcomings. For example, they are easily oxidized at high temperatures and form non-protective oxides on the surface of the alloy. The matrix under the oxide layer dissolves a large amount of oxygen atoms to form a brittle oxygen-rich layer, which seriously damages The mechanical properties of the alloy affect the use of titanium alloys. [0003] The research o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/129C23C4/08
CPCC23C4/08
Inventor 刘敏邓春明杨文瀑张吉阜邓畅光毛杰邝子奇周克崧
Owner GUANGDONG INST OF NEW MATERIALS
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