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Neodymium iron boron metallographic analysis sample preparation method

A metallographic analysis and NdFeB technology, which is applied in the field of NdFeB metallographic analysis sample preparation, can solve problems such as blurred metallographic patterns and difficulties in metallographic sample preparation, and achieve clear grain boundaries, obvious microstructure defects, and The simple effect of the sample process

Inactive Publication Date: 2013-02-13
山西京宇天成科技有限公司
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Problems solved by technology

[0002] For existing NdFeB metallographic analysis, due to the difference in sample preparation process and the particularity of NdFeB materials, the final metallographic pattern is blurred, and metallographic sample preparation is difficult. Often it takes more than 10 sample preparations to succeed once. Physical and chemical analysts bring a lot of work intensity, and there is no standard method for NdFeB metallographic production. Therefore, NdFeB metallographic analysis is not used to guide the phenomenon in the actual production process. In fact, NdFeB The microstructure and metallographic structure of boron determine the macroscopic properties of NdFeB, such as magnetic properties, mechanical properties, corrosion resistance, bending strength, drift characteristics and other indicators. Therefore, it is necessary to study a simple and effective NdFeB gold phase sample preparation method is very necessary

Method used

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  • Neodymium iron boron metallographic analysis sample preparation method
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  • Neodymium iron boron metallographic analysis sample preparation method

Examples

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Embodiment 1

[0010] Such as figure 1 Shown: a sample preparation method for NdFeB metallographic analysis. The method is to grind the NdFeB magnet sample flat on a grinding machine, and then polish it with a polishing machine equipped with 1000-mesh metallographic sandpaper. During the polishing process, add Water is used as a lubricant. After polishing, use a mixture of alcohol with a mass fraction of 88% and nitric acid with a mass fraction of 12% as a corrosion solution. Use a cotton swab dipped in a small amount of corrosion solution, and repeatedly wipe the polished surface 20 times in one direction, and then rinse with water. Clean it and put it on the metallographic analyzer for analysis.

Embodiment 2

[0012] Such as figure 2 Shown: a sample preparation method for NdFeB metallographic analysis. The method is to grind the NdFeB magnet sample flat on a grinding machine, and then polish it with a polishing machine equipped with 1000-mesh metallographic sandpaper. During the polishing process, add Water is used as a lubricant. After polishing, use a mixture of alcohol with a mass fraction of 92% and nitric acid with a mass fraction of 8% as a corrosion solution. Use a cotton swab dipped in a small amount of corrosion solution, and repeatedly wipe the polished surface 25 times in one direction, and then rinse with water. Clean it and put it on the metallographic analyzer for analysis.

Embodiment 3

[0014] Such as image 3 Shown: a sample preparation method for NdFeB metallographic analysis. The method is to grind the NdFeB magnet sample flat on a grinding machine, and then polish it with a polishing machine equipped with 1000-mesh metallographic sandpaper. During the polishing process, add Water is used as a lubricant. After polishing, use a mixture of alcohol with a mass fraction of 90% and nitric acid with a mass fraction of 10% as a corrosion solution. Use a cotton swab dipped in a small amount of corrosion solution, and repeatedly wipe the polished surface in one direction for 30 times, and then rinse with water. Clean it and put it on the metallographic analyzer for analysis.

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Abstract

The invention relates to a neodymium iron boron metallographic analysis sample preparation method. The method comprises the following steps of: firstly grinding a neodymium iron boron magnet sample on a grinding machine; polishing with a polishing machine with 1,000-mesh metallographic abrasive paper, and adding water as a lubricant in the polishing process; after the polishing, repeatedly wiping on the polishing surface toward one direction for 20-28 times (preferably 25 times) by a cotton swab dipped with a little corrosive liquid which is the mixed liquid of 88-92% of alcohol and 8-12% of nitric acid by mass; and then flushing the sample with water, and analyzing on a metallographic analyzer. According to the method, the sample preparation technology is simple, convenient and efficient; and in the prepared metallographic graph, main-phase crystal grains are protruding, the crystal boundary is clear, and the microstructure defect is obvious.

Description

technical field [0001] The invention relates to the field of NdFeB microstructure analysis, in particular to a sample preparation method for NdFeB metallographic analysis. Background technique [0002] For existing NdFeB metallographic analysis, due to the difference in sample preparation process and the particularity of NdFeB materials, the final metallographic pattern is blurred, and metallographic sample preparation is difficult. Often it takes more than 10 sample preparations to succeed once. Physical and chemical analysts bring a lot of work intensity, and there is no standard method for NdFeB metallographic production. Therefore, NdFeB metallographic analysis is not used to guide the phenomenon in the actual production process. In fact, NdFeB The microstructure and metallographic structure of boron determine the macroscopic properties of NdFeB, such as magnetic properties, mechanical properties, corrosion resistance, bending strength, drift characteristics and other i...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/32
Inventor 马跃华贾建伟崔学军范正为贾建华
Owner 山西京宇天成科技有限公司
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