A kind of preparation method of titanium alloy gradient material resistant to high temperature oxidation
A high-temperature oxidation-resistant, gradient material technology, applied in metal material coating process, ion implantation plating, coating, etc., can solve the problems of high content of Nb element, change of plasticity and toughness, and decrease of specific strength, etc., to achieve anti-oxidation Improved performance, uniform temperature field of infiltrated metal, and reduced loss
Inactive Publication Date: 2016-06-29
TAIYUAN UNIV OF TECH
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Problems solved by technology
Ti-45Nb is a kind of flame-retardant titanium alloy developed in the United States. The content of Nb element is large, and the specific strength decreases, resulting in difficulty in smelting, poor process performance, and high cost. The plasticity and toughness of the overall flame-retardant titanium alloy are better than that of the original titanium alloy. big change
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[0015] Below in conjunction with embodiment the present invention is further described.
[0016] A preparation method of a high-temperature oxidation-resistant titanium alloy gradient material adopts the following steps:
[0017] S1. Set the anode, cathode and source inside the sealed furnace, the cathode is made of titanium-aluminum base alloy workpiece, the source is made of metal element plates to be infiltrated, and the sealed furnace is evacuated and filled with a vacuum pump. Inert gas to about 20Pa and cooling water, apply 800-900V voltage to the cathode, continue to fill argon gas to about 25Pa, carry out sufficient pre-bombardment on the titanium-aluminum-based alloy workpiece, and pre-bombard the Clean the titanium-aluminum-based alloy workpiece, activate the surface to facilitate the adsorption of active atoms, and heat it to 300 degrees;
[0018] S2. After pre-bombarding the titanium-aluminum-based alloy workpiece, adjust it to a working pressure of 20-80pa, apply...
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The invention discloses a preparation method of a high-temperature oxidation resistant titanium alloy gradient material. The preparation method comprises the following steps of: S1, completely bombarding a titanium aluminum base alloy work-piece in advance; S2, applying voltage to a source electrode and a negative electrode, adsorbing and depositing a permeable alloy element in the source electrode to the surface of the titanium aluminum base alloy workpiece with larger activity, diffusing and permeating into the inner part of the workpiece in high temperature, thus obtaining a surface alloy layer containing a permeable metal element; and S3, switching off source electrode power supply and negative power supply after the appointed diffusion metalizing time is reached, vacuumizing a sealing furnace as ultimate vacuum, and drawing a charge after the high-temperature oxidation resistant titanium alloy gradient material is cooled to room temperature. According to the invention, the surface alloy layer containing the permeable metal element is formed on the surface of the work-piece, so that the high-temperature oxidation resistance of the work-piece is greatly improved.
Description
technical field [0001] The invention relates to the technical field of material processing engineering, in particular to a preparation method of a high-temperature oxidation-resistant titanium alloy gradient material. Background technique [0002] Titanium alloys are widely used in the aviation industry because of their high specific strength, good corrosion resistance and heat resistance. However, its combustion characteristics in a specific environment restrict its application in high-performance aero-engines. In a high-temperature and high-pressure environment, titanium alloys are rapidly oxidized. The oxidation reaction is an exothermic process, and a self-propagating reaction will occur, resulting in the combustion of titanium. These phenomena often occur in the high-pressure compressor of the engine. The development of flame-retardant titanium alloys and the improvement of engine design are important measures to prevent fires, and the surface alloying of titanium and...
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IPC IPC(8): C23C14/16C23C14/38C23C10/28
Inventor 王文波贺志勇刘小平王振霞尤凯宁来元
Owner TAIYUAN UNIV OF TECH