Method for preparing Al2O3 thin film and Cr2O3 thin film by controlling oxygen pressure through powder stack

A technology of cr2o3 and powder pile, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of rising material cost and performance deterioration

Inactive Publication Date: 2018-03-30
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to form a dense selective oxide film, enough alloying elements must be added, which will lead to deterioration of other properties and increase the cost of materials

Method used

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  • Method for preparing Al2O3 thin film and Cr2O3 thin film by controlling oxygen pressure through powder stack
  • Method for preparing Al2O3 thin film and Cr2O3 thin film by controlling oxygen pressure through powder stack
  • Method for preparing Al2O3 thin film and Cr2O3 thin film by controlling oxygen pressure through powder stack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Arc melting Fe-3Al-4Cr alloy, homogenized annealing in vacuum atmosphere for 1 week;

[0020] (2) Cut the annealed sample into thin slices of 1 mm, polish the surface after grinding off the scale, and wash with alcohol and acetone to remove impurities and oil on the surface.

[0021] (3) Put the Fe-FeO powder pile (mass ratio 1:1) into the quartz tube, then evacuate and sag the middle of the quartz tube (the middle part of the quartz tube is not closed, so that the alloy and the powder pile are separated and the atmosphere can circulate) , after the quartz tube is cooled, put it into the alloy and vacuum seal it;

[0022] (4) Put the quartz tube into the double-temperature tube furnace, and the heating temperature of the powder pile is 800°C (10 -19 atm), the heating temperature of the alloy is 950°C, and it can be heated together for 1 hour to form pure Cr on the surface 2 o 3 film, such as figure 2 shown.

Embodiment 2

[0024] (1) Arc melting Fe-3Al-6Cr alloy, homogenized annealing in vacuum atmosphere for 1 week;

[0025] (2) The sample after annealing is cut into thin slices after 1 mm, polished after grinding off the surface scale, and cleaned with alcohol and acetone to remove impurities and oil stains on the surface;

[0026] (3) Alloy and Fe-FeO powder heap (mass ratio 1:1) is put into quartz tube successively and seal after container is pumped into high vacuum by vacuum pump;

[0027] (4) Put the quartz tube into the double-temperature tube furnace, and the heating temperature of the powder pile is 800°C (10 -19 atm), the heating temperature of the alloy is 950°C, and the alloy can be heated together for 1 hour to form Al on the surface 2 o 3 、Cr 2 o 3 mixed membranes, such as image 3 shown.

Embodiment 3

[0029] (1) Arc melting Fe-3Al-6Cr alloy, homogenized annealing in vacuum atmosphere for 1 week;

[0030] (2) The sample after annealing is cut into thin slices after 1 mm, polished after grinding off the surface scale, and cleaned with alcohol and acetone to remove impurities and oil stains on the surface;

[0031] (3) Put the Fe-FeO powder pile (mass ratio 1:1) into the quartz tube, then evacuate the middle part of the quartz tube to sag (not close, so that the atmosphere can circulate), put the quartz tube into the alloy after cooling Vacuum sealing;

[0032] (4) Put the quartz tube into the double-temperature tube furnace, and the heating temperature of the powder pile is 860°C (10 -17 atm), the heating temperature of the alloy is 1000°C, and it can be heated together for 1 hour to form pure Al on the surface 2 o 3 film, such as Figure 4 shown.

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Abstract

The invention belongs to the surface coating coating technology, and particularly relates to a method for preparing an Al2O3 thin film and a Cr2O3 thin film by controlling oxygen pressure through a powder stack. According to the method, the new powder stack Fe-FeO is used for controlling the oxygen pressure, the Al2O3 thin film and the Cr2O3 thin film are prepared under the low oxygen pressure through few adding elements, the oxygen pressure is adjusted so that pure Al2O3 or Cr2O3 or a mixture of Al2O3 and Cr2O3 can be obtained, and the content is far smaller than the content of Al and Cr needing to be added for preparing of the Al2O3 thin film and the Cr2O3 thin film in air. Compared with the manner of controlling the oxygen pressure by introducing gas, the method is safer and more saving. Components of the powder stack cannot evaporate and are evaporated on the alloy surface to generate phase changes with a matrix.

Description

technical field [0001] The patent of the present invention belongs to the surface coating technology, and specifically relates to the preparation method of selective oxidation of Al and Cr alloys containing active elements under low oxygen pressure conditions to form a high-temperature oxidation-resistant film on the surface. Background technique [0002] Metal is a widely used material, and a large number of alloying elements (Cr, Al, Si, Mn, Re) are usually added to improve high temperature oxidation resistance and room temperature corrosion resistance. When these elements are heated at high temperature in the atmosphere, selective oxidation will occur, and a dense oxide film will be formed on the surface to protect the surface of the material, which is also the essence of oxidation resistance of superalloys. However, in order to form a dense selective oxide film, sufficient alloying elements must be added, which will lead to deterioration of other properties and increase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/62C23C8/02
CPCC23C8/62C23C8/02
Inventor 苏旭平严靖钰王建华涂浩刘亚吴长军彭浩平
Owner CHANGZHOU UNIV
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