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Preparation method of TiAl/Ti2AlC coating with strong combination and high corrosion resistance

A high corrosion resistance and coating technology, which is applied in coating, metal material coating process, ion implantation plating, etc., can solve the problems of low purity of MAX phase and unsatisfactory corrosion resistance, so as to improve corrosion resistance and oxidation performance Effect

Pending Publication Date: 2022-07-08
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The MAX phase prepared by this method has low purity and cannot meet the requirements of corrosion resistance in harsh marine environments

Method used

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  • Preparation method of TiAl/Ti2AlC coating with strong combination and high corrosion resistance
  • Preparation method of TiAl/Ti2AlC coating with strong combination and high corrosion resistance
  • Preparation method of TiAl/Ti2AlC coating with strong combination and high corrosion resistance

Examples

Experimental program
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Effect test

Embodiment 1

[0048] In this embodiment, the substrate is used as a TC serving a device in a seawater environment 4 The preparation method of the Ti-Al-C MAX phase coating on the surface of the substrate is as follows:

[0049] (1) Wash the substrate with acetone and alcohol in turn to remove grease and soluble impurities on the surface, put it into the cavity, and wait until the pressure in the cavity reaches 10 -3 At Pa, the substrate was heated to 400 °C for 5 min, and the heating was turned off. When the vacuum degree reaches 2.0×10 -3 Below Pa, 50sccm of argon gas was passed into the cavity, the substrate bias was set to -400V, and the sample was cleaned with ionized argon ions for 30min.

[0050] (2) The temperature was heated to 300° C. and maintained, and the TiAl transition layer was deposited by high-power pulsed magnetron sputtering, wherein the cathode target provided Ti and Al sources, and the power of the sputtering target was adjusted to 115W. The argon flow rate was set t...

Embodiment 2

[0059] Different from Example 1, in this comparative example, the bias voltage is -80V. After annealing at 700°C, the phase purity of the sample reaches 83wt%, and only a small amount of TiAl exists. The corrosion current density is 2×10 -10 A / cm 2 , the binding force reaches 70N, among which, Figure 4 XRD pattern of the MAX phase coating prepared in Example 2.

Embodiment 3

[0061] The difference from Example 1 is that the power of the TiAl target in this comparative example is 115W. After annealing at 700°C, the TiAl 2 The content of AlC MAX phase reaches 88wt%, and there is a trace of TiAl crystallization peak, and the corrosion current density is 4×10 -10 A / cm 2 , the binding force is 73N.

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Abstract

The invention discloses a TiAl / Ti2AlC (TiAl / Ti2AlC) strong bonding corrosion-resistant coating. The method comprises the following steps: firstly, depositing a TiAl layer of which the crystal structure is a close-packed hexagonal structure on the surface of a substrate by sputtering a TiAl target (Ti: Al = 1: 1) with the purity of 99.95% by using a high-power pulse magnetron sputtering system; then co-sputtering a TiAl target and a graphite target by using a high-power pulse magnetron sputtering source and a direct-current magnetron sputtering source at the same time, and depositing a Ti-Al-C layer on the surface of the TiAl layer to obtain a TiAl / Ti-Al-C double-layer coating; and finally, heat treatment is conducted, so that the Ti-Al-C layer is converted into a Ti2AlC MAX phase coating (the phase purity is larger than 83 wt.%). The method is simple in preparation process and easy to control, and the prepared composite coating has good compactness and high seawater corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and in particular relates to a strong-bonded high-corrosion-resistant TiAl / Ti 2 Preparation method of AlC coating. Background technique [0002] At present, with the continuous development of science and technology, the fields of application of materials and devices are becoming more and more extensive, the service environment is becoming more and more severe, and the requirements for corrosion-resistant coatings are becoming higher and higher, such as corrosion-resistant coatings in marine environments. coating. [0003] In response to the changing application environment, the corrosion-resistant coating has also undergone a development process from unit to multi-layer, and the coating structure has gradually developed from a single layer to a composite multi-layer. Existing research shows that transition metal nitrogen / carbide is the commonly used coating system among many coating...

Claims

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Application Information

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IPC IPC(8): C23C14/16C23C14/06C23C14/35C23C14/58
CPCC23C14/165C23C14/0635C23C14/0036C23C14/3485C23C14/345C23C14/352C23C14/5806
Inventor 汪爱英周定伟王振玉周广学李忠昌
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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