Titanium alloy composite capable of resisting high temperature oxidation and hot salt corrosion and preparation method thereof

Abstract

The invention discloses a titanium alloy composite capable of resisting high temperature oxidation and hot salt corrosion and a preparation method thereof. The titanium alloy composite comprises a titanium alloy substrate; a ceramic transition layer and an enamel coating are arranged on the surface of the titanium alloy substrate; the ceramic transition layer is located between the titanium alloysubstrate and the enamel coating; the ceramic transition layer is a micro-arc oxidation ceramic layer; and the enamel coating and the ceramic transition layer form a high-temperature protection gradient composite coating on the titanium alloy substrate. The titanium alloy composite is excellent in resistance to high temperature oxidation and high temperature hot salt corrosion and the gradient composite coating is good in chemical stability.

Description

technical field [0001] The invention relates to a titanium alloy material, in particular to a titanium alloy composite material resistant to high temperature oxidation and hot salt corrosion, and a preparation method of the titanium alloy composite material. Background technique [0002] Titanium alloy has the characteristics of low density, high specific strength, high-temperature mechanical properties and good corrosion resistance. It is an excellent high-temperature structural material and is mainly used for the preparation of aero-engines. [0003] When the titanium alloy is used at a temperature exceeding 600°C, an oxide film with poor oxidation resistance will be formed on the surface, which will lead to a serious decrease in the performance of the titanium alloy. [0004] At present, the heat-resistant titanium alloys used in my country's aero-engines are mainly TC1~TC10, etc., and their service temperature is usually lower than 600°C; in addition, when titanium alloy...

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Problems solved by technology

[0013] 2. When oxidation occurs at the interface between the enamel coating and the titanium alloy substrate, the oxygen in the enamel gradually migrates to the titanium alloy substrate at the interface, and the dissolved oxygen in the titanium alloy substrate will increase, thereby reducing the oxidation resistance of the ceramic coating ability;

[0014] 3. Most titanium alloys contain Al element, the main component of SiO in enamel coating 2 When in contact with TiAl in titanium alloy, it will react to form TiSiO under the condition of firing molding temperature. 3 Phase, TiSiO 3 Phase will reduce the bonding force between enamel coating and titanium alloy substrate

[0015] In summary, in the existing technology, although there are many technologies for improving the high-temperature oxidation resistance and high-temperature hot-salt corrosion resistance of titanium alloys, and each has its own advantages, they cannot improve the high-temperature oxidation resistance and high-temperature hot-salt corrosion resistance of titanium alloys after all. Effectively raised to a higher level

That is to say, the high-temperature oxidation resistance and high-temperature hot-salt corrosion resistance of the titanium alloy composite materials prepared by the above-mentioned existing technologies are still insufficient, which limits the progress of my country's aero-engine technology to a higher level and needs to be overcome.