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Method of preparing titanium coating through atmosphere supersonic plasma spraying based on gas protection

A supersonic plasma, gas shielding technology, applied in coating, metal material coating process, melt spraying, etc., can solve the problem of high oxide and nitride content in titanium coating, difficulty in controlling spraying speed, and coating bonding strength. To achieve the effect of low porosity, short residence time and small spraying distance

Active Publication Date: 2016-11-23
ACADEMY OF ARMORED FORCES ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of high oxide and nitride content of titanium coating and poor corrosion resistance of the coating in the existing method of spraying titanium coating, and provide a gas-protected atmospheric supersonic plasma spraying titanium coating method for preparing low-oxidation and nitrided titanium coatings through a gas shield
[0006] Another object of the present invention is to overcome the difficulty in controlling the spraying speed in the existing method for spraying titanium coatings, resulting in poor bonding strength of the coating, and to provide a calculation method for spraying speed to improve the bonding strength of the coating

Method used

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  • Method of preparing titanium coating through atmosphere supersonic plasma spraying based on gas protection
  • Method of preparing titanium coating through atmosphere supersonic plasma spraying based on gas protection
  • Method of preparing titanium coating through atmosphere supersonic plasma spraying based on gas protection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] use as figure 2 The radial protective gas anode nozzle provided prepares a pure titanium coating on an aluminum alloy substrate, and the specific steps are as follows:

[0063] (1) An aluminum alloy with a size of 60×25×5 mm is prepared as a substrate for preparing a titanium coating.

[0064] (2) Use alcohol and ultrasonic cleaning to clean the surface of the substrate to remove oil and impurities.

[0065] (3) Use a press-in sandblasting machine to roughen the surface of the substrate by sandblasting, and the sand grains are 24# white corundum sand. The blasting distance is 150mm.

[0066] (4) Fix the substrate in front of the spray gun. During spraying, the manipulator operates the atmospheric supersonic plasma spray gun to move and scan the substrate quickly in a "well" shape, and form a titanium coating on the substrate after 30 rounds.

[0067] Among them, the relevant parameters of the spraying process are as follows:

[0068] On the nozzle of the original hig...

Embodiment 2

[0086] Compared with embodiment 1, adopt as image 3 The axial shielding gas nozzles shown have shielding gas holes according to the following dimensions:

[0087] L1=8.5mm, L2=3mm, α=55°, β=15°, d1=2.2mm.

[0088] Correspondingly in figure 1 The shown 6 powder feeding racks are drilled in the corresponding direction, and 9 diversion structures are installed, and connected with Ar gas.

[0089] The parameters of shielding gas during spraying are:

[0090] Pressure 1MPa, flow rate 50L / min.

[0091] Other parameters are the same as in Example 1.

[0092] The cross-section of titanium coating prepared by axial shielding gas nozzle is as follows: Figure 6 shown. The porosity of the coating is slightly higher than that of the titanium coating prepared by the radial shielding gas nozzle, and the oxygen content is 0.2 . The shielding gas shield that illustrates the performance of the axial shielding gas nozzle can also reduce the oxidation and nitriding of titanium particles,...

Embodiment 3

[0094] Compared with Example 2, let L2=2.5mm, β=0°, and other parameters are the same as Example 2. At this time, the shielding gas is ejected from the nozzle along the axial direction of the jet, and a protective gas shield is formed outside the jet. The nozzle structure Such as Figure 7 shown.

[0095] The parameters of shielding gas during spraying are:

[0096] The pressure is 1.3MPa and the flow rate is 80L / min.

[0097] Other parameters are the same as in Example 1.

[0098] use Figure 7 The titanium coating section prepared by the axial shielding gas nozzle is as follows Figure 8 shown. The porosity of the coating is comparable to that of the titanium coating prepared in Example 2, and the oxygen content is 0.2 . The shielding gas shield that illustrates the performance of the axial shielding gas nozzle can also reduce the oxidation and nitriding of titanium particles, but the effect is lower than that of the radial shielding gas nozzle.

[0099] Analyze accor...

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Abstract

The invention discloses a method of preparing a titanium coating through atmosphere supersonic plasma spraying based on gas protection. The method comprises the following steps of: step one. cleaning and roughening the surface of a base material; step two. feeding Ti powder into a supersonic plasma spraying gun, feeding an Ar gas serving as a protecting gas into a protecting gas hole of a radial protecting gas positive pole nozzle or an axial protecting gas positive pole nozzle, wherein the flow rate of Ar is 100-190L / min, and the amount of the fed powder is 15-50g / min; and step three. maintaining a spraying distance at 60-90mm, and spraying the surface of the base material. The method has the beneficial effects that the content of oxide and nitride in the coating can be reduced; the high-purity Ti coating can be obtained; and the corrosion resistance of the coating is improved.

Description

technical field [0001] The invention relates to the technical field of coating preparation, in particular to a method for spraying a titanium coating with gas-protected atmospheric supersonic plasma. Background technique [0002] Because titanium has excellent corrosion resistance, mechanical properties and process properties, it is widely used in many sectors of the national economy, but the high price of titanium limits its wider and low-cost application. According to statistics, in 2013, the output of sponge titanium in my country was 80,000 tons, and the amount of titanium alloy corrosion resistance used in the amount of titanium materials reached more than 60%, including chemical industry, ocean, ship, salt industry, etc. The consumption of titanium materials is huge, how to reduce the consumption of titanium materials has always been a difficult problem in the industry. The preparation of Ti coating by thermal spraying is an effective way to reduce the consumption of ...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/137C23C4/08
CPCC23C4/08
Inventor 刘明王海军张伟赵华星陈书赢汪勇
Owner ACADEMY OF ARMORED FORCES ENG PLA
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