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Method for preparing Ti-Al family intermediate phase/Ti-Al-N family MAX phase composite coating on surface of titanium or titanium alloy

A technology of composite coating and mesophase layer, applied in metal material coating process, coating, superimposed layer plating and other directions, can solve the problem of performance mismatch between coating and substrate, to ensure performance and improve bonding degree, the effect of reducing the cost of raw materials

Active Publication Date: 2021-08-31
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention is suitable for preparing Ti-Al-based mesophase / Ti-Al-N-based MAX phase composite coatings for titanium or titanium alloy workpieces with complex structures, and solves the problem of mismatching properties between coatings and substrates

Method used

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  • Method for preparing Ti-Al family intermediate phase/Ti-Al-N family MAX phase composite coating on surface of titanium or titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 Shown, the preparation method of the present embodiment comprises the following steps:

[0029] Step 1. Use a metal cleaning agent to degrease and clean the surface of the TC4 titanium alloy round rod, and then immerse it in a saturated K 2 ZrF 6 Flux for 2 minutes, take it out and put it in the drying box to dry;

[0030] Step 2. Immerse the TC4 titanium alloy round bar covered with fluxing agent in step 1 in the pure aluminum liquid protected by covering agent KCl:NaCl:NaF=4:3:1 (molar ratio), and control the hot-dip plating temperature to 700°C, keep warm for 3 minutes, and quickly put out water quenching. Form the TiAl required above 3 The thickness of the phase layer is 50 microns;

[0031] Step 3. Immerse the TC4 titanium alloy round rod after hot-dip plating in step 2 in a 10wt.% NaOH hot solution heated in a water bath at 75°C to dissolve the pure aluminum layer and expose TiAl 3 mesophase layer;

[0032] Step 4. Before nitriding, use HF:...

Embodiment 2

[0034] Such as figure 1 Shown, the preparation method of the present embodiment comprises the following steps:

[0035] Step 1. Use a metal cleaning agent to degrease and clean the surface of the TC4 titanium alloy round rod, and then immerse it in a saturated K 2 ZrF 6 Flux for 2 minutes, take it out and put it in the drying box to dry;

[0036] Step 2. Immerse the TC4 titanium alloy round bar covered with fluxing agent in step 1 in the pure aluminum liquid protected by covering agent KCl:NaCl:NaF=4:3:1 (molar ratio), and control the hot-dip plating temperature to 750°C, keep warm for 6 minutes, and quickly put out water quenching. Form the TiAl required above 3 The thickness of the phase layer is 100 microns;

[0037] Step 3. Immerse the TC4 titanium alloy round rod after hot-dip plating in step 2 in a 10wt.% NaOH hot solution heated in a water bath at 75°C to dissolve the pure aluminum layer and expose TiAl 3 mesophase layer;

[0038] Step 4. Before nitriding, use HF...

Embodiment 3

[0040] Such as figure 1 Shown, the preparation method of the present embodiment comprises the following steps:

[0041] Step 1. Use a metal cleaning agent to degrease and clean the surface of the TC4 titanium alloy round rod, and then immerse it in a saturated K 2 ZrF 6 Flux for 2 minutes, take it out and put it in the drying box to dry;

[0042] Step 2. Immerse the TC4 titanium alloy round bar covered with fluxing agent in step 1 in the pure aluminum liquid protected by covering agent KCl:NaCl:NaF=4:3:1 (molar ratio), and control the hot-dip plating temperature to 800°C, keep warm for 9 minutes, and quickly put out water quenching. Form the TiAl required above 3 The thickness of the phase layer is 150 microns;

[0043] Step 3. Immerse the TC4 titanium alloy round rod after hot-dip plating in step 2 in a 10wt.% NaOH hot solution heated in a water bath at 75°C to dissolve the pure aluminum layer and expose the TiAl 3 mesophase layer;

[0044] Step 4. Before nitriding, us...

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Abstract

The invention discloses a method for preparing a Ti-Al family intermediate phase / Ti-Al-N family MAX phase composite coating on the surface of titanium or a titanium alloy. The method comprises the following steps of 1, carrying out oil removal cleaning and plating assistance on the surface of the titanium or the titanium alloy; 2, forming a Ti-Al family intermediate phase layer and a pure aluminum layer on the surface of the titanium or the titanium alloy through a hot dip aluminum plating technology; 3, immersing the titanium or the titanium alloy obtained after hot dipping in a NaOH hot solution, dissolving away the pure aluminum layer, and exposing a TiAl3 intermediate phase layer; and 4, enabling the titanium or the titanium alloy with the exposed TiAl3 intermediate phase layer to be subjected to gas nitriding, and finally forming the Ti-Al family intermediate phase / Ti-Al-N family MAX phase composite coating. According to the method, a step-by-step plating method that hot dip aluminum plating is conducted firstly and then gas nitriding is conducted is adopted, it is ensured that the TiAl3 intermediate phase layer with excellent high-temperature oxidation resistance is formed preferentially, and then TiAl3 reacts with nitriding atmosphere NH3 to form a Ti-Al-N family MAX phase layer which is resistant to abrasion, high-temperature oxidation and corrosion on the outer surface of a TiAl3 phase. The method is suitable for preparing the Ti-Al family intermediate phase / Ti-Al-N family MAX phase composite coating on a titanium or titanium alloy workpiece with a complex structure, the coating is tightly combined with a matrix, and the preparation method is simple, convenient, low in cost and easy to implement.

Description

technical field [0001] The invention relates to the technical field of titanium or titanium alloy surface treatment, in particular to a method for preparing a Ti-Al-based intermediate phase / Ti-Al-N-based MAX phase composite coating on the surface of titanium or titanium alloy. Background technique [0002] Titanium and its alloys have excellent comprehensive properties such as light weight, high specific strength, strong heat resistance, and corrosion resistance. They are known as "future metals" and are a new type of structural material with development prospects. Titanium alloys have been widely used in various sectors of the national economy. It is an indispensable material in rockets, missiles and space shuttles. Now it has been widely used in many industrial sectors such as shipbuilding, chemical industry and power generation. [0003] Gas nitriding technology is a chemical heat treatment method, which can make the workpiece obtain high surface hardness, wear resistan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23G1/22C23C2/02C23C2/12C23C2/26C23C2/28C23C8/02C23C8/24
CPCC23C28/321C23C28/34C23C2/02C23C2/12C23C2/26C23C2/28C23G1/22C23C8/02C23C8/24
Inventor 李发国张家霖黄凯瑶齐福刚尹付成谢颖胡孝愿
Owner XIANGTAN UNIV
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