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Preparation method for high pure aluminium metallographic sample

A metallographic sample and high-purity technology, which is applied in the field of preparing metallographic samples showing the structure of high-purity aluminum, can solve the problems of incomplete metallographic display grain boundaries, affecting the normal appearance of grain boundaries, and inability to distinguish grain boundaries, etc. Simple operation, reduced chance of scratches, low labor-intensive effect

Inactive Publication Date: 2014-06-04
LIDA OPTICAL & ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, we have few metallographic studies on high-purity metals such as Al, Cu, Ti, Ta, etc. Because high-purity aluminum with a purity of more than 99.999% has few impurities and difficult nucleation, the metallographic display of grain boundaries will be incomplete, or even The grain boundary cannot be distinguished, and the high-purity aluminum is soft, and it is easy to leave scratches during the sample preparation process, which affects the normal appearance of the grain boundary

Method used

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  • Preparation method for high pure aluminium metallographic sample
  • Preparation method for high pure aluminium metallographic sample

Examples

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Embodiment 1

[0016] A method for preparing a high-purity aluminum metallographic sample, comprising the steps of:

[0017] (1) Sampling: Sampling 14mmX16mm high-purity aluminum samples with a thickness of 12mm by wire cutting. It is required to have a smooth metallographic surface without obvious unevenness;

[0018] (2) Coarse grinding: on the polishing machine, at 200 # Polish the silicon carbide water abrasive paper with water, and when the polished surface looks smooth and even, change to 400 # The silicon carbide water abrasive paper is polished with water. After changing the sand, the sample should be rotated 90 degrees until the scratches of the previous process are completely worn away, and the direction of the new scratches is the same;

[0019] (3) fine grinding: will use 400 # Sandpaper ground samples, after switching the angle of 90 degrees, respectively at 600 # , 800 # and 1000 # Carry out hand grinding on sandpaper. The hand grinding force should be moderate. If the for...

Embodiment 2

[0024] A method for preparing a high-purity aluminum metallographic sample, comprising the steps of:

[0025] (1) Sampling: Sampling 12mmX10mm high-purity aluminum samples with a thickness of 13mm by wire cutting. It is required to have a smooth metallographic surface without obvious unevenness;

[0026] (2) Coarse grinding: On the polishing machine, the sample is roughly ground to 400 # sandpaper;

[0027] (3) Fine grinding: at 600 in turn # , 800 # and 1000 # Grind the sample block with water on the sandpaper;

[0028] (4) Polishing: according to step (4) of Example 1, the sample was electropolished on an electropolishing instrument for 55 seconds at room temperature;

[0029] (5) Film coating: according to the step (5) of Example 1, the film coating was also carried out on the polishing machine for 2 minutes and 40 seconds.

[0030] This example is the metallographic photograph of 99.9999% high-purity aluminum prepared by the technology of the present invention, from ...

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Abstract

The invention discloses a preparation method for a high pure aluminium metallographic sample. The preparation method comprises the following steps of sampling; coarse grinding; fine grinding; electrolysis polishing and film mulching. A formula of a film mulching liquid is composed of hydrofluoric acid, fluoboric acid and distilled water. A volume ratio of hydrofluoric acid (mL) to fluoboric acid (g) to distilled water (mL) is 15:(5-6):400. A prepared high pure aluminium clear metallograph provides convenience for better studying structure and performance of internal tissues of high pure aluminium. The method is simple in operation, low in labor intensity, low in material consumption and high in efficiency.

Description

technical field [0001] The invention belongs to the technical field of metallographic sample preparation, and in particular relates to a method for preparing a metallographic sample showing structure of high-purity aluminum. Background technique [0002] Observing the metal grinding surface with an optical microscope and studying the relationship between its microstructure and composition and performance has gradually become an effective means of studying and examining the structure of metal materials. Because of this, "metallography" has been applied to other disciplines, and even since The technology that targets metal materials is expanded to a technology that can be applied to all materials. [0003] Because the metallographic analysis technique is simple, efficient and practical, it is one of the most extensive research and analysis methods in the field of materials and scientific engineering. In the past few decades, there have been many studies on metallography, incl...

Claims

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Application Information

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IPC IPC(8): G01N1/28
Inventor 张文勇张向东宋小利杨太礼王毅付勇
Owner LIDA OPTICAL & ELECTRONICS
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