Method for preparing Ti-Al-Si composite gradient coating on surface of titanium alloy through two-step hot-dip aluminizing method
A ti-al-si, gradient coating technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems such as the inability to form phase layers, and achieve the effect of cost saving
Pending Publication Date: 2022-07-01
XIANGTAN UNIV
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Problems solved by technology
However, since Si will combine with Ti before Al to form a Ti-Si compound, TiAl cannot be formed 3 Layer
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[0031] (1) place the crucibles containing pure aluminum and Al-Si alloy respectively in a melting furnace under an argon atmosphere and heat to 750°C for melting and heat preservation;
[0032] (2) The surface of the Ti65 titanium alloy rectangular sheet is ground flat, and the oxide scale and oil stains are removed by the method of acid washing and alkali washing, and then placed in a drying box to dry;
[0033] (3) immersing the Ti65 titanium alloy rectangular sheet in the step (2) into the crucible containing the pure aluminum liquid in the step (1), and standing at 750° C. to carry out the titanium-aluminum atom interdiffusion reaction for 20 minutes;
[0034] (4) Supplement a certain amount of argon gas in the melting furnace, extract the Ti65 titanium alloy rectangular sheet from the pure aluminum liquid in step (3), and then quickly immerse it into the crucible containing the Al-Si alloy liquid in step (1). medium; stand at 750 ℃ for 20 minutes of silicon atom thermal...
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The invention relates to a method for preparing a Ti-Al-Si composite gradient coating on the surface of titanium alloy. According to the Ti-Al-Si composite gradient coating, a titanium alloy is subjected to primary hot dipping in pure aluminum liquid, then a titanium alloy workpiece is extracted from the pure aluminum liquid under argon protection and rapidly immersed in Al-Si alloy liquid for secondary hot dipping, finally high-temperature pre-oxidation is conducted, and the Ti-Al-Si composite gradient coating is obtained. And the composite gradient coating with the Ti-Al-Si multiphase layer gradient structure and the aluminum-silicon concentration gradient is formed. According to the method, a Ti-Al binary alloy phase layer, a Ti-Al / Ti-Si mixed phase layer, a Ti (Al, Si) 3 phase layer of solid solution Si atoms and a tau2 phase + Al2O3 layer are sequentially formed on the surface of the titanium alloy. According to the Ti-Al-Si composite gradient coating prepared through the two-step hot-dip aluminizing method, the high-temperature oxidation resistance of the coating can be improved, the coating is good in thermal stability, good in combination with a matrix, high in crack propagation resistance, simple in preparation process and low in cost, the use temperature of a titanium alloy workpiece can be greatly increased, and the service life of the titanium alloy workpiece can be greatly prolonged.
Description
technical field [0001] The invention relates to the field of coating preparation by hot dip plating, in particular to a method for preparing a Ti-Al-Si composite gradient coating on the surface of a titanium alloy by a two-step hot dip aluminizing method. Background technique [0002] As the heart of an aircraft, aero-engines not only have to withstand extreme stress and high temperature, but also ensure a high thrust-to-weight ratio (thrust / mass). High-temperature titanium alloy has the advantages of low density, high specific strength, corrosion resistance, and high temperature performance. At present, titanium alloy materials are used in engine compressor discs, blades, high-pressure compressor rotors, compressor casings and other components. With the development of high thrust-to-weight ratio engines and high Mach number aircraft, the requirements for high temperature oxidation resistance of titanium alloys are getting higher and higher. However, the most advanced high-...
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IPC IPC(8): C23C10/22C23C10/26C23C10/02C23C10/60
CPCC23C10/22C23C10/26C23C10/02C23C10/60
Inventor 李发国何为吕羿扬林玲袁香香谭洁梅
Owner XIANGTAN UNIV