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Method for improving high-temperature-oxidation resistance of TC4 titanium alloy

A high-temperature oxidation-resistant, titanium alloy technology, applied in anodic oxidation, metal material coating process, ion implantation plating, etc., can solve the problems of weak oxidation resistance of titanium alloys, achieve high-temperature oxidation resistance, wide application, Combining the effects of high performance

Inactive Publication Date: 2017-05-10
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] TC4 titanium alloy has a series of advantages such as excellent corrosion resistance, small density, high specific strength, good toughness and weldability, and has been widely used in aerospace, petrochemical, shipbuilding, automobile, pharmaceutical and other departments , but the TC4 titanium alloy has weak oxidation resistance and can only be used at 500 o In the environment below C, the long-term working environment temperature is usually less than 400 o C

Method used

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  • Method for improving high-temperature-oxidation resistance of TC4 titanium alloy
  • Method for improving high-temperature-oxidation resistance of TC4 titanium alloy
  • Method for improving high-temperature-oxidation resistance of TC4 titanium alloy

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Experimental program
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Effect test

Embodiment 1

[0014] On the surface of the TC4 alloy, an arc ion plating technology and an aluminum target with a purity greater than 99.9wt.% are used to deposit a 2.1 micron thick aluminum coating on the surface. The size of the TC4 sample is 20mm×30mm×2mm. Before the arc ion plating, it is roughly ground with 1200# sandpaper to remove the oxide skin on the surface. It is cleaned with ethanol in an ultrasonic cleaner for 3 minutes, and then dried with a hair dryer for later use. The main process parameters of the arc ion aluminum coating are: argon gas flow rate: 200mL / min, target diameter: 100mm, arc current 100A, substrate bias voltage -200V, deposition time 2min.

[0015] Then at room temperature, the TC4 alloy with aluminum coating on the surface is used as the anode, placed in a 100g / L sodium silicate solution, and treated with a square wave pulse micro-arc oxidation power supply with a frequency of 1200Hz and a duty cycle of 60% for 20 minutes , the square wave pulse current density...

Embodiment 2

[0017] On the surface of the TC4 alloy, an arc ion plating technology and an aluminum target with a purity greater than 99.9wt.% are used to deposit a 2.4 micron thick aluminum coating on the surface. The size of the TC4 sample is 20mm×30mm×2mm. Before the arc ion plating, it is roughly ground with 1200# sandpaper to remove the oxide skin on the surface. It is cleaned with ethanol in an ultrasonic cleaner for 3 minutes, and then dried with a hair dryer for later use. The main process parameters of the arc ion aluminum coating are: argon gas flow rate: 200mL / min, target diameter: 100mm, arc current 100A, substrate bias voltage -200V, deposition time 2.5min.

[0018] Then at room temperature, the TC4 alloy with aluminum coating on the surface is used as the anode, placed in a 100g / L sodium silicate solution, and treated with a square wave pulse micro-arc oxidation power supply with a frequency of 1200Hz and a duty cycle of 60% for 20 minutes , the square wave pulse current densi...

Embodiment 3

[0020] On the surface of the TC4 alloy, an arc ion plating technology and an aluminum target with a purity greater than 99.9wt.% are used to deposit a 2.9 micron thick aluminum coating on the surface. The size of the TC4 sample is 20mm×30mm×2mm. Before the arc ion plating, it is roughly ground with 1200# sandpaper to remove the oxide skin on the surface. It is cleaned with ethanol in an ultrasonic cleaner for 3 minutes, and then dried with a hair dryer for later use. The main process parameters of the arc ion aluminum coating are: argon gas flow rate: 200mL / min, target diameter: 100mm, arc current 100A, substrate bias voltage -200V, deposition time 3min.

[0021] Then at room temperature, the TC4 alloy with aluminum coating on the surface is used as the anode, placed in a 100g / L sodium silicate solution, and treated with a square wave pulse micro-arc oxidation power supply with a frequency of 1200Hz and a duty cycle of 60% for 20 minutes , the square wave pulse current density...

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Abstract

Provided is a method for improving high-temperature-oxidation resistance of TC4 titanium alloy. The method includes the steps that an aluminum coating with the thickness being 2-3 micrometers is deposited on the surface of the TC4 alloy through an arc ion plating technology and an aluminum target with the purity of more than 99.9wt%, and then the TC4 alloy with the aluminum coating on the surface is used as an anode at the room temperature and placed in a 100g / L sodium silicate solution so as to be subjected to micro-arc oxidation treatment for 20 minutes through a square-wave pulse power supply with the frequency of 1200 Hz and the duty ratio of 60%, wherein the square-wave pulse current density is 15 A / dm2, and during micro-arc oxidation, 304 stainless steel with the surface area 2-3 times that of the TC4 alloy is used as the cathode. An oxidized film mainly containing aluminum oxide and silicon oxide is produced on the surface of the TC4 titanium alloy, the oxidized film is high in bonding performance with the base body, namely the TC4 titanium alloy, and thus the oxidation temperature to which the TC4 titanium alloy can resist in air is increased to 800 DEG C from 500 DEGC. By means of the method, the high-temperature-oxidation resistance of the TC4 titanium alloy is remarkably improved, and the method is simple and can be widely applied.

Description

technical field [0001] The invention relates to a method for improving the high-temperature oxidation resistance of TC4 titanium alloy. Background technique [0002] Arc ion plating technology is a widely used surface protective coating technology. It has outstanding advantages such as fast deposition rate, good bonding performance between the film layer and the substrate, and high compactness of the coating. It can prepare a variety of coatings, such as excellent wear resistance High-performance high-hardness titanium nitride coatings, aluminum coatings with good atmospheric corrosion resistance, etc., are widely used in industry. Micro-arc oxidation technology is a new surface treatment technology that directly grows ceramic films on the surface of aluminum, magnesium, titanium and other non-ferrous metals in situ. The treatment process is simple, the process is environmentally friendly, and the film performance after treatment is superior. [0003] TC4 titanium alloy has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/16C23C14/32C23C14/58C25D11/04
CPCC23C14/16C23C14/325C23C14/5853C25D11/024C25D11/026C25D11/04
Inventor 冯长杰蒋利民
Owner NANCHANG HANGKONG UNIVERSITY
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