A method for improving high temperature oxidation resistance of tial-based alloys by pre-oxidation

A high-temperature anti-oxidation, base alloy technology, applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of destructive mechanical properties, poor plasticity at room temperature, oxidation, etc., and achieve simple process, cheap and easy raw materials The effect

Inactive Publication Date: 2018-06-05
TONGJI UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, TiAl-based alloys have the following disadvantages: (1) Poor plasticity at room temperature; (2) High-temperature oxidation resistance is seriously insufficient. When the service temperature is higher than 750 ° C, the oxidation is severe, which greatly damages the mechanical properties

Method used

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  • A method for improving high temperature oxidation resistance of tial-based alloys by pre-oxidation
  • A method for improving high temperature oxidation resistance of tial-based alloys by pre-oxidation
  • A method for improving high temperature oxidation resistance of tial-based alloys by pre-oxidation

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Embodiment 1

[0034] A method for improving the high-temperature oxidation resistance of TiAl-based alloys by pre-oxidation, specifically comprising the following steps: cutting the TiAl-based alloys to a suitable size, polishing them smooth with sandpaper, and cleaning them with acetone to obtain TiAl-based alloy sample 1, which is placed in corundum In tube 4, the surface is sequentially buried with Al 2 O 3 Powder Layer 2 and Al+Al 2 O 3 Mixed powder layer 3, the mass fraction of Al powder in the mixed powder layer is 30%, see the specific burying method figure 1 , place the corundum tube 4 with the buried sample in the tube furnace, evacuate the tube furnace and fill it with high-purity argon. The temperature was raised to 950 °C at a heating rate of 8 K / min, and the temperature was kept for 10 h. The sample was cooled in the furnace, and a dense layer of Al was formed on the surface of the TiAl-based alloy matrix. 2 O 3 membrane. After taking out the sample, a constant temperatur...

Embodiment 2

[0037] This embodiment is basically the same as Embodiment 1, the difference lies in the Al+Al of this embodiment 2 O 3 The mass content of Al powder in the mixed powder layer was 50%. The samples prepared in this example were subjected to a constant temperature oxidation experiment at 900°C for 100 hours in a muffle furnace. It was found that the pre-oxidized samples had an oxidation weight gain of 1.6442 mg / cm after 100 hours. 2 .

Embodiment 3

[0039] This embodiment is basically the same as Embodiment 1, the difference lies in the Al+Al of this embodiment 2 O 3 The mass content of Al powder in the mixed powder layer was 10%.

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Abstract

The invention relates to a method for improving the high-temperature oxidation resistance of a TiAl-based alloy by pre-oxidation. The method comprises the following steps: (1) sequentially covering the surface of the pretreated TiAl-based alloy with a powder layer of an oxide of a metal and a mixed power layer of the metal and the oxide of the metal, and placing the TiAl-based alloy in an inert atmosphere or a vacuum environment; and (2) performing heating to 800-1,000 DEG C, and performing heat preservation for 2-20 h to form an extremely low oxygen partial pressure environment around the TiAl-based alloy to promote the generation of a compact Al2O3 film on the surface of the TiAl-based alloy so as to improve the high-temperature oxidation resistance of the TiAl-based alloy. Compared with the prior art, the method improves the high-temperature oxidation resistance of the TiAl-based alloy by providing the extremely low oxygen partial pressure environment and not breaking the overall mechanical properties of the material, and has the advantages of simple process, low cost and the like.

Description

technical field [0001] The invention relates to the field of high-temperature oxidation resistance of TiAl-based alloys, in particular to a method for improving the high-temperature oxidation resistance of TiAl-based alloys through pre-oxidation technology. Background technique [0002] Compared with traditional titanium alloys and superalloys, TiAl-based alloys have very significant comprehensive properties, that is, low density, high specific strength, excellent creep resistance and high temperature mechanical properties. This performance can meet the application requirements of high-temperature components of automobiles or aero-engines, such as compressor blades and turbochargers. Due to the high density of nickel-based superalloys, TiAl-based alloys are ideal materials to partially replace nickel-based superalloys. However, TiAl-based alloys have the following disadvantages: (1) poor plasticity at room temperature; (2) seriously insufficient high-temperature oxidation re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/62
CPCC23C8/62
Inventor 沈军曲寿江汤守巧冯聪朱涛
Owner TONGJI UNIV
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