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Method for preparing complete morphology of oxide film section

A technology of oxide film and cross-section, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as difficult to judge the growth law of oxide film

Inactive Publication Date: 2019-04-19
CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the cross-sectional morphology of the oxide film cannot completely see the growth direction of the cross-sectional oxide film, and it is difficult to judge the growth law of the oxide film. Therefore, the present invention provides a method for preparing the complete cross-sectional morphology of the oxide film for metal materials.

Method used

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  • Method for preparing complete morphology of oxide film section
  • Method for preparing complete morphology of oxide film section
  • Method for preparing complete morphology of oxide film section

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A method for preparing the complete morphology of the cross-section of an oxide film, comprising the following steps:

[0026] (1) Take a sample from the P91 steel pipe and cut it into a square sample. Use a wire cutting machine to process a U-shaped groove on the sample. The distance from the bottom of the U-shaped groove to the nearest surface of the sample is 0.1mm, such as figure 1 As shown, the U-shaped notch is figure 1 A notch with a U-shaped profile in the top view of the square sample;

[0027] (2) Grinding the 6 faces of the obtained processed sample to obtain a polished sample; the grinding method is: successively select sandpaper with a particle size of 200 mesh, 400 mesh, 600 mesh, 800 mesh and 1000 mesh for grinding, and then Before grinding each time, clean and dry the polished sample of the last time, and then continue grinding after rotating the sample 90° on the basis of the previous time;

[0028] (3) Put the polished sample in the crucible, place t...

Embodiment 2

[0033] A method for preparing the complete morphology of the cross-section of an oxide film, comprising the following steps:

[0034] (1) Take a sample from P91 steel pipe and cut it into a square sample. Use a wire cutting machine to process a U-shaped groove on the sample. The distance from the bottom of the U-shaped groove to the nearest surface of the sample is 0.5mm;

[0035] (2) Grinding the 6 faces of the obtained processed sample to obtain a polished sample; the grinding method is: successively select sandpaper with a particle size of 200 mesh, 400 mesh, 600 mesh, 800 mesh and 1000 mesh for grinding, and then Before grinding each time, clean and dry the polished sample of the last time, and then continue grinding after rotating the sample 90° on the basis of the previous time;

[0036] (3) Put the polished sample in the crucible, place the crucible and the sample in a high-temperature heat treatment furnace, set the test temperature to 566°C, turn on the switch button ...

Embodiment 3

[0040] A method for preparing the complete morphology of the cross-section of an oxide film, comprising the following steps:

[0041] (1) Take a sample from P91 steel pipe and cut it into a square sample. Use a wire cutting machine to process a U-shaped groove on the sample. The distance from the bottom of the U-shaped groove to the nearest surface of the sample is 0.3mm;

[0042] (2) Grinding the 6 faces of the obtained processed sample to obtain a polished sample; the grinding method is: successively select sandpaper with a particle size of 200 mesh, 400 mesh, 600 mesh, 800 mesh and 1000 mesh for grinding, and then Before grinding each time, clean and dry the polished sample of the last time, and then continue grinding after rotating the sample 90° on the basis of the previous time;

[0043] (3) Put the polished sample in the crucible, place the crucible and the sample in a high-temperature heat treatment furnace, set the test temperature to 600°C, turn on the switch button ...

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Abstract

The invention discloses a method for preparing the complete morphology of an oxide film section. According to the method, by means of the characteristics that the brittleness of a metal material is increased at a low temperature, an oxide film sample is directly broken after the metal material is oxidized at a high temperature, and the section morphology of the oxide film on the fracture surface of the sample is observed. By means of the method, the problems that after the metal material is oxidized, the surface of the oxide film is ground and polished, the complete morphology of the oxide film is destroyed, and the complete morphology, growth direction and stratification condition of the oxide film cannot be observed are solved; the section of the broken oxide film is not subjected to other processes, and then the complete section morphology of the oxide film can be clearly displayed. The method has great significance in studying the growth mechanism and formation rule of the oxide film by showing the complete morphology of oxide film.

Description

technical field [0001] The invention relates to a method for preparing the complete cross-sectional morphology of an oxide film, which belongs to the field of high-temperature oxidation. Background technique [0002] In recent years, phenomena such as the shortage of renewable energy and air pollution have attracted more and more attention, and energy conservation and environmental protection have gradually become a consensus among people. Ultra-supercritical units have gradually become the main direction of thermal power construction due to their advantages such as low energy consumption, high efficiency, and low pollutant emissions. At present, the maximum steam temperature of thermal power units in service in my country is 620°C, and it may gradually develop to 630°C, 650°C or even 700°C in the future. The continuous increase of steam temperature will inevitably put forward higher requirements on the steam oxidation resistance of materials. Therefore, for ultra-supercrit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/2202G01N23/2251
CPCG01N23/2202G01N23/2251G01N2223/07G01N2223/102G01N2223/61
Inventor 句光宇杨希锐邓辉乔梁王昊王东
Owner CENT CHINA BRANCH OF CHINA DATANG CORP SCI & TECH RES INST CO LTD
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