Ti2AlC corrosion resisting coating preparing method

Abstract

The invention relates to a Ti2AlC corrosion resisting coating preparing method. Titanium aluminum carbon powder is scattered in isopropanol to be prepared into suspension liquid, then, simple substance tellurium is added, the mixed suspension liquid is arranged in a container, a ZIRLO alloy sample obtained after sand blasting treatment is clamped on a cathode clamp of a container cover, a graphiteelectrode serves as an anode to be immersed in the mixed suspension liquid to be subjected to pulse electrophoretic deposition treatment, flash burning sintering treatment is conducted after drying,and a dense and uniform Ti2AlC ceramic coating is obtained. Compared with the prior art, the flash burning technology is adopted in the method to assist high-voltage pulse electrophoretic deposition,and the uniform and dense Ti2AlC coating with good interface bonding and controllable components and structures is prepared on the surface of a zirconium alloy base body.

Description

technical field [0001] The invention relates to a method of depositing a coating, in particular to a Ti 2 Preparation method of AlC corrosion-resistant coating. Background technique [0002] Metallic Zr has excellent nuclear properties, 0.18×10 -28 m 2 The thermal neutron absorption section coefficient is second only to beryllium (0.009×10 -28 m 2 ), magnesium (0.06×10 -28 m 2 ) and aluminum (0.22×10 -28 m 2 ), and various Zr alloys used in the nuclear industry (such as Zr-2.5Nb, Zr-4, ) neutron cross section coefficient is only 0.20~0.24×10 -28 m 2 . Using Zr alloy instead of stainless steel as the nuclear reactor core structure material can save 1 / 2 uranium fuel and has high economic benefits. And because of the good compatibility between Zr and uranium, interdiffusion will only occur when the temperature is higher than 750 °C. Zr alloys have certain corrosion resistance in high temperature and high pressure water vapor at 300-400 °C, and have excellent neut...

AI Technical Summary

Problems solved by technology

Preparation of Ti by plasma spraying and ultra-high velocity flame spraying 2 AlC coating: On the one hand, the base material needs to withstand high temperature, which will cause thermal damage to the base material; on the other hand, in order to obtain a thicker and dense coating, the temperature of the spraying flame must be increased, which will make the coating The material is oxidized and decomposed, which will lead to poor performance of the coating, and high temperature will cause a large thermal stress inside the coating, causing defects in the coating

In order to overcome the above shortcomings, the researchers used cold spraying technology to prepare Ti 2 AlC coating, although it overcomes the problems of substrate damage and coating material oxidative decomposition caused by high temperature, it is difficult to control the thickness and density of the coating

At the same time, magnetron sputtering and other physical vapor deposition methods prepare Ti 2 AlC coating, this method also needs to heat the substrate, and the deposition efficiency is low and the cost is high

Therefore, the researchers proposed the electrophoretic deposition method to prepare the MAX phase coating, which is not only carried out in a solution at room temperature (lower preparation temperature), but also can deposit a coating on the surface of a substrate with a complex shape, but the coating prepared by this method is relatively weak. Poor, the final target coating must be obtained after post-sintering heat treatment, which will also cause thermal damage to the base material

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