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Nickel-chromium-aluminum-iron alloy transmission electron microscope sample preparation method

A technology for transmission electron microscope samples and iron alloys, applied in scanning probe technology, instruments, etc., can solve the problems of coarse grains, good corrosion resistance and lattice distortion of nickel-chromium-aluminum-iron alloys, and achieve uniform thin area and large area. Effect

Active Publication Date: 2018-05-15
CHONGQING CHUANYI AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of transmission samples mainly includes electrolytic double spraying and ion thinning methods. For nickel-chromium-aluminum-iron alloys, due to their greater work-hardening tendency, work-hardening and lattice distortion are prone to occur during the ion-thinning process, resulting in Artifacts are generated during transmission electron microscope observation, so it is not suitable to use
At the same time, nickel-chromium-aluminium-iron alloys have coarse grains, high hardness, and good corrosion resistance, and it is difficult to prepare samples for electrolytic double-spray thinning; especially, there is a lack of effective electrolytic double-spray thinning liquid formula and corresponding process conditions , has become an important restrictive factor in exploring the relationship between the microstructure and electrical properties of nickel-chromium-aluminum-iron alloys

Method used

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  • Nickel-chromium-aluminum-iron alloy transmission electron microscope sample preparation method
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  • Nickel-chromium-aluminum-iron alloy transmission electron microscope sample preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Cut the sample, cut the nickel-chromium-aluminum-iron alloy sample to a thickness of 1mm by mechanical cutting method.

[0038] 2) Pre-grinding, grind the sample with sandpaper from low to high grades, and grind according to the "8" shape or vertical direction. Pay attention to clean the sandpaper and the sample every time the sandpaper is changed, and finally pre-grind the sample with sandpaper to a thickness of about 45 μm. The final grinding should be done with sandpaper above 800# to ensure that the surface of the pre-ground sample is smooth and free of scratches. crease or bend.

[0039] 3) Slicing: Use a punching machine to punch a disc with a diameter of 3 mm to ensure that there are no burrs on the edge of the punching, and avoid burrs from causing tip discharge or blocking the electron beam.

[0040] 4) Preparation of double-spray solution: prepare a double-spray solution of 10% perchloric acid, 3% citric acid, and 87% absolute ethanol by volume.

[0041] ...

Embodiment 2

[0046] 1) Cutting the sample, cutting the nickel-chromium-aluminum-iron alloy sample to a thickness of 0.8mm by mechanical cutting method.

[0047] 2) Pre-grinding, grind the sample with sandpaper from low to high grades, and grind in the shape of "8" or vertically. Pay attention to clean the sandpaper and the sample every time the sandpaper is changed, and finally pre-grind the sample with sandpaper to a thickness of about 42 μm. The final grinding should be done with sandpaper above 800# to ensure that the surface of the pre-ground sample is smooth and free of scratches. crease or bend.

[0048] 3) Slicing: Use a punching machine to punch a disc with a diameter of 3 mm to ensure that there are no burrs on the edge of the punching, and avoid burrs from causing tip discharge or blocking the electron beam.

[0049] 4) Preparation of double-spray solution: prepare a double-spray solution of 8% perchloric acid, 2% citric acid, and 90% absolute ethanol by volume.

[0050] 5) Ele...

Embodiment 3

[0055] 1) Cutting the sample, cutting the nickel-chromium-aluminum-iron alloy sample to a thickness of 0.5mm by mechanical cutting method.

[0056]2) Pre-grinding, grind the sample with sandpaper from low to high grades, and grind in the shape of "8" or vertically. Pay attention to clean the sandpaper and the sample every time the sandpaper is changed, and finally pre-grind the sample with sandpaper to a thickness of about 40 μm. The final grinding should be done with sandpaper above 800# to ensure that the surface of the pre-ground sample is smooth and free of scratches. crease or bend.

[0057] 3) Slicing: Use a punching machine to punch a disc with a diameter of 3 mm to ensure that there are no burrs on the edge of the punching, and avoid burrs from causing tip discharge or blocking the electron beam.

[0058] 4) Preparation of double-spray solution: Prepare a double-spray solution of 11% perchloric acid, 4% citric acid, and 85% absolute ethanol by volume.

[0059] 5) Ele...

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Abstract

The invention relates to a nickel-chromium-aluminum-iron alloy transmission electron microscope sample preparation method. The method comprises steps of 1) sample cutting, 2) pre-grinding, 3) slicing,4) twin-jet thinning, 5) ultrasonic sample cleaning for three times and 6) cleaning and the like. According to the nickel-chromium-aluminum-iron alloy transmission sample prepared by the method of the invention, the sample has a large thin area, the thin area has a uniform thickness, and a high-quality transmission electron microscope sample picture can be acquired under the transmission electronmicroscope.

Description

technical field [0001] The invention relates to a method for preparing a metal sample, in particular to a method for preparing a nickel-chromium-aluminum-iron alloy transmission electron microscope sample. Background technique [0002] Nickel-chromium-aluminium-iron alloy is mainly used to make precision resistance elements. The alloy is characterized by high resistivity and low temperature coefficient of resistance in the normal operating temperature range; and compared with general alloy materials, the alloy's resistance characteristics Have abnormal behavior. In the solution treatment state of heating above 1000°C, heat preservation, and rapid cooling (water cooling) to room temperature, the resistivity of nickel-chromium-aluminum-iron alloy is low; after aging treatment at about 500°C, its resistivity will increase. However, general alloy materials (such as steel, aluminum alloy, etc.) have high resistivity in the solution treatment state, and the resistivity will decre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01Q30/20
CPCG01Q30/20
Inventor 杨贤军徐永红吴达喻文新余小玲
Owner CHONGQING CHUANYI AUTOMATION
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