Method for efficiently preparing XRD (X-Ray Diffraction) texture detection sample of specified thickness layer of non-oriented silicon steel

Abstract

The invention provides a method for efficiently preparing a non-oriented silicon steel specified thickness layer XRD texture detection sample. The method is suitable for two conditions that the distance between the specified thickness layer and the surface is smaller than 1 / 2 of the thickness and equal to 1 / 2 of the thickness (the center position). Under the condition that the thickness is smaller than 1 / 2, the sample is gradually thinned to the specified thickness through ultrasonic cleaning, diluted hydrochloric acid corrosion, abrasive paper polishing and perchloric acid treatment. For the condition of the center position, the sample is precisely thinned to the center thickness through ultrasonic cleaning, diluted hydrochloric acid corrosion and multi-step abrasive paper polishing. The method is easy and convenient to operate, the sample meeting the XRD texture detection requirement can be efficiently and accurately prepared, and the method is suitable for texture analysis of the non-oriented silicon steel material and has high practicability and popularization value.

Description

Technical Field

[0001] The present invention relates to the technical field of material X-ray diffraction detection, and in particular to an efficient preparation method for non-oriented silicon steel XRD (X-ray diffraction) texture detection samples, which is particularly suitable for preparing samples of specified thickness layers. Background Art

[0002] Non-oriented silicon steel is widely used in power equipment such as motors and transformers, and its texture characteristics have an important influence on magnetic properties. After hot rolling, non-oriented silicon steel ingots form recrystallized grains with uneven size distribution on the surface, while the center layer is still a deformed structure, resulting in obvious differences in the texture of the material with different thickness layers. For example, the surface texture of non-oriented silicon steel is mainly Gaussian texture, while the center layer structure is stretched along the rolling direction to form a fiber structure of varying widths. The texture is mainly composed of strong α fiber and γ fiber deformation texture. In addition, the normalized texture component is close to the hot rolled texture component, but the strength is weakened. It can be seen that studying the texture of different thickness layers of non-oriented silicon steel is of great significance to the research and development of the material and its magnetic properties.

[0003] X-ray diffraction (XRD) is the primary method for analyzing the texture of non-oriented silicon steel, but the quality of XRD texture specimen preparation directly impacts the accuracy of the test results. Traditional XRD texture specimen preparation methods suffer from the following issues: ① low preparation efficiency and time consumption; ② mechanical damage during cutting and grinding, which affects the accuracy of texture analysis; and ③ difficulty in precisely controlling the specimen thickness, resulting in unrepresentative test results. Therefore, developing a highly efficient, low-damage specimen preparation method that can precisely control the thickness is crucial.

[0004] This invention aims to develop a method for efficiently preparing XRD texture specimens of a specified thickness in non-oriented silicon steel. This method addresses the low efficiency, high damage, and inaccurate thickness control issues of conventional methods. This method not only rapidly prepares low-damage XRD texture specimens, but also precisely controls the thickness of the XRD texture specimens. Summary of the Invention

[0005] The purpose of the present invention is to address the above problems and provide a method for efficiently preparing XRD texture detection samples of non-oriented silicon steel layers of specified thickness.

[0006] The object of the present invention is achieved as follows: a method for efficiently preparing a non-oriented silicon steel specified thickness layer XRD texture detection sample, including the following two situations: (1) the specified thickness layer is less than 1 / 2 of the thickness of the entire sample from the sample surface: 1) cutting the non-oriented silicon steel sample and cleaning it; 2) immersing the sample in a mixture of hydrochloric acid and distilled water for pickling, then immersing it in anhydrous ethanol for cleaning, and drying it with nitrogen, and measuring its thickness with a screw micrometer; 3) coarsely grinding the sample obtained in 2), cleaning it, drying it with nitrogen, and then placing it in a mixed solution of anhydrous ethanol and perchloric acid for chemical treatment, and finally cleaning it in clean anhydrous ethanol, and using Blow dry with nitrogen; 4) Perform double-sided fine grinding and final cleaning of the sample obtained in 3), blow dry with nitrogen, and place the obtained sample in a sample box for use; (2) The specified thickness layer is at a distance from the sample surface = 1 / 2 of the thickness of the entire sample: 1) Cut a non-oriented silicon steel sample and clean it; 2) Immerse the sample in a mixture of hydrochloric acid and distilled water for pickling, then immerse it in anhydrous ethanol for cleaning, blow dry with nitrogen, and measure its thickness with a screw micrometer; 3) Perform coarse grinding + single-sided fine grinding of the sample obtained in 2), clean it and blow dry with nitrogen, then put it in clean anhydrous ethanol for cleaning, blow dry with nitrogen, and place the obtained sample in a sample box for use.

[0007] In step 1) and step 2) of (1), a non-oriented silicon steel sample to be tested with a size of 10-20 mm × 20-25 mm × 0.8-3 mm and a thickness of 0.8-3 mm is taken from the non-oriented silicon steel plate, and then the non-oriented silicon steel sample to be tested is immersed in clean anhydrous ethanol and ultrasonically cleaned at 40-50 Hz for 120-300 seconds. After cleaning off the oil stains on the surface of the non-oriented silicon steel sample to be tested, it is placed in a beaker containing a mixture of 7%-12% hydrochloric acid and distilled water and allowed to stand for 5-40 minutes. It is then taken out with tweezers and immersed in clean anhydrous ethanol for cleaning 2-3 times, each time for 10-15 seconds. It is then blown dry with nitrogen, and its thickness is measured with a screw micrometer to determine whether it reaches the specified thickness.

[0008] Place the sample obtained in step 2) of step 3) of (1) between a Φ50~80mm rubber stopper and 320~600 mesh sandpaper. Press the rubber stopper lightly on both sides to polish off the loose powder on the sample surface until the sample thickness is 20~35μm thicker than the specified thickness. Then place the sample in a beaker of anhydrous ethanol and perform ultrasonic cleaning at 40~50Hz for 120~300s to remove surface residues. Then blow dry with nitrogen. Immerse the sample after rough grinding, cleaning and drying in a mixed solution consisting of 30~50mL anhydrous ethanol and 3mL~5mL perchloric acid with a concentration of 70.0%~72.0% for 3~15min. Then, pick it out with tweezers and immerse it in clean anhydrous ethanol for 2~3 times, each time for 10~15s, and then blow dry with nitrogen.

[0009] For the sample obtained in step 3) of step 4) of (1), press the Φ50~80mm rubber plug lightly on 2500~4000 mesh sandpaper to polish off the surface powder on both sides until the sample thickness reaches the specified thickness. Then place the sample in a beaker of anhydrous ethanol and perform ultrasonic cleaning at 40~50Hz for 120~300s to remove surface residues. Then blow it dry with nitrogen and put it into the sample box for use.

[0010] In step 1) and step 2) of (2), a non-oriented silicon steel sample to be tested with a size of 10-20 mm × 20-25 mm × 0.8-3 mm and a thickness of 0.8-3 mm is taken from the non-oriented silicon steel plate, and then the non-oriented silicon steel sample to be tested is immersed in clean anhydrous ethanol for 40-50 Hz ultrasonic cleaning for 120-300 s. After cleaning the oil stains on the surface of the non-oriented silicon steel sample to be tested, it is placed in a beaker of a mixture of 7%-12% hydrochloric acid and distilled water and allowed to stand for 10-50 min. It is then taken out with tweezers and immersed in clean anhydrous ethanol for cleaning 2-3 times, each time for 10-15 s. It is then blown dry with nitrogen, and its thickness is measured with a screw micrometer to determine whether it reaches the specified thickness.

[0011] In step 3) of (2), a Φ50-80 mm rubber plug is pressed by hand onto 800-1200 mesh sandpaper to polish off the surface powder on both sides until the sample thickness reaches 220-350 μm. Then, the plug is polished on one side in a circle on 2500-4000 mesh sandpaper until the sample thickness is 110-175 μm. The sample is then placed in a beaker of anhydrous ethanol and ultrasonically cleaned at 40-50 Hz for 120-300 seconds to remove surface residues. The sample is then blown dry with nitrogen and placed in a sample box for use.

[0012] The present invention has the following beneficial effects: The present invention provides a method for efficiently preparing XRD texture testing samples for a specified thickness layer of non-oriented silicon steel, which eliminates the mechanical damage layer caused by wire cutting or grinding during sample preparation, thereby improving the surface quality of the sample. The use of two acid solution etchings slows down sample thinning and shortens sample preparation time. After each thinning step, the sample thickness is measured with a screw micrometer, ensuring the accuracy of the sample thickness and improving the representativeness of the test results. This method is suitable for preparing XRD texture testing samples for specified thickness layers of non-oriented silicon steel of varying thicknesses and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] Figure 1 : Schematic diagram of the process of the present invention.

[0015] Figure 2 : Plane XRD texture result diagram of 1 / 4 thickness layer of non-oriented silicon steel prepared by the present invention.

[0016] Figure 3 : XRD texture result diagram of the plane of 1 / 2 thickness layer (sample core) of non-oriented silicon steel prepared by the present invention. DETAILED DESCRIPTION

[0017] A method for efficiently preparing a non-oriented silicon steel specified thickness layer XRD texture detection sample is characterized by being divided into two parts: a specified thickness layer with a distance from the surface of less than 1 / 2 thickness and a specified thickness layer with a distance from the surface of equal to 1 / 2 thickness (at the core of the sample), comprising the following steps: 1.1, a specified thickness layer with a distance from the surface of less than 1 / 2 thickness: 1.1.1 Cut a non-oriented silicon steel sample and clean it; 1.1.2 Immerse the sample in dilute hydrochloric acid for pickling and then in anhydrous ethanol for cleaning, blow dry with nitrogen, and measure its thickness with a screw micrometer; 1.1.3 Roughly grind the sample in 1.1.2, clean it, blow dry it with nitrogen, then put it into a mixed solution of perchloric acid and anhydrous ethanol for chemical treatment, finally wash it in clean anhydrous ethanol, and blow dry it with nitrogen; 1.1.4 Finely grind and finally clean the sample in 1.1.3 on both sides, blow dry it with nitrogen, and put the obtained sample into a sample box for standby use.

[0018] 1.2. The distance between the specified thickness layer and the surface is 1 / 2 thickness (at the center of the sample): 1.2.1 Cut a non-oriented silicon steel sample and clean it; 1.2.2 Immerse the sample in dilute hydrochloric acid for pickling, then in anhydrous ethanol for cleaning, blow dry with nitrogen, and measure its thickness with a screw micrometer; 1.2.3 Roughly grind the sample in 1.2.2 and finely grind one side, clean it, blow dry it with nitrogen, then wash it in clean anhydrous ethanol, blow dry it with nitrogen, and place the resulting sample in a sample box for use.

[0019] In the step 1.1.1, a (10-20) mm × (20-25) mm × (0.8-3) mm (thick) sample to be tested is taken from the non-oriented silicon steel plate, and then the sample to be tested is immersed in clean anhydrous ethanol for ultrasonic cleaning for 120-300 seconds. After cleaning the oil stains on the surface of the sample, the sample is placed in a beaker containing a mixture of 7%-12% hydrochloric acid and distilled water and left to stand for 5-40 minutes. The sample is then picked out with polytetrafluoroethylene tweezers and immersed in clean anhydrous ethanol for cleaning 2-3 times, each time for 10-15 seconds. The sample is then blown dry with nitrogen gas, and its thickness is measured with a screw micrometer to be 120-200 μm thicker than the specified thickness of the XRD texture to be tested.

[0020] Place the sample obtained in step 1.1.2 between a Φ50-80 mm rubber stopper and 320-600 grit sandpaper. Gently press the rubber stopper on both sides to remove any loose powder from the sample surface until the sample thickness is 20-35 μm thicker than the specified thickness for the XRD texture to be tested. Then, ultrasonically clean the sample in a beaker of anhydrous ethanol for 120-300 seconds to remove any surface residue, and then blow dry with nitrogen.

[0021] Immerse the coarsely ground, cleaned, and dried specimen in a mixture of 50 mL of anhydrous ethanol and 3 mL to 5 mL of 70.0% to 72.0% perchloric acid for 3 to 15 minutes. Then, remove the specimen with polytetrafluoroethylene tweezers and rinse it in clean anhydrous ethanol 2 to 3 times for 10 to 15 seconds each time. Then, blow dry it with nitrogen.

[0022] For the sample obtained in 1.1.3, manually press a Φ50-80 mm rubber stopper onto 2500-4000 grit sandpaper to remove any surface powder on both sides until the sample thickness reaches the specified thickness for the XRD texture to be tested. Then, ultrasonically clean the sample in a beaker of anhydrous ethanol for 120-300 seconds to remove any surface residue. Then, blow dry with nitrogen and place it in a sample box for later use.

[0023] In step 1.2.2, the sample obtained in step 1.2.1 needs to be placed in a beaker containing a mixture of 7% to 12% hydrochloric acid and distilled water and allowed to stand for 10 to 50 minutes.

[0024] The thickness of the sample obtained in step 1.2.2 was measured by a screw micrometer to be 300-500 μm.

[0025] In step 1.2.3, manually press a Φ50-80 mm rubber plug onto 800-1200 mesh sandpaper and polish both sides to remove surface powder until the sample thickness reaches 220-350 μm. Then, polish one side in a circle on 2500-4000 mesh sandpaper until the sample thickness is 110-175 μm. Then, place the sample in a beaker of anhydrous ethanol and ultrasonically clean it for 120-300 seconds to remove surface residue. Then, blow dry it with nitrogen and place it in a sample box for use.

[0026] Based on the objective problems that arise during the preparation of conventional non-oriented silicon steel XRD texture test samples, the present invention provides a method for efficiently preparing non-oriented silicon steel XRD texture test samples of a specified thickness layer, which solves the problems of low preparation efficiency, long preparation time, mechanical damage, and inability to accurately control the sample thickness layer, thereby affecting the accuracy of texture analysis of non-oriented silicon steel and resulting in unrepresentative test results. The non-oriented silicon steel XRD texture test sample prepared by this method can achieve the rapid preparation of XRD texture test samples with low damage and accurately controlled thickness layer.

[0027] A method for efficiently preparing a non-oriented silicon steel specified thickness layer XRD texture detection sample, the method includes the following two cases: (1) the specified thickness layer is less than 1 / 2 thickness from the surface: 1) a (10~20) mm×(20~25) mm×(0.8~3) mm (thickness) test sample is taken from the non-oriented silicon steel plate, and then the test sample is immersed in clean anhydrous ethanol for ultrasonic cleaning for 120~300 s. After cleaning the oil stains on the surface of the sample, it is placed in a beaker containing a 7%~12% hydrochloric acid distilled water mixture and left to stand for 5~40 min. It is then picked up with polytetrafluoroethylene tweezers and immersed in clean anhydrous ethanol for cleaning 2~3 times, each time for 10~15 s, and then blown dry with nitrogen. The thickness is measured with a screw micrometer to achieve a thickness of 120~200 μm thicker than the specified thickness of the XRD texture to be detected. 2) For the sample obtained in 1), manually press a Φ50-80 mm rubber stopper onto 320-600 grit sandpaper to remove any loose powder from both sides of the surface until the sample thickness is 20-35 μm thicker than the specified thickness for the XRD texture to be tested. Then, ultrasonically clean the sample in a beaker of anhydrous ethanol for 120-300 seconds to remove any surface residue, and then blow dry with nitrogen. 3) Immerse the sample obtained in 2) in a mixture of 50 mL of anhydrous ethanol and 3 mL-5 mL of 70.0%-72.0% perchloric acid for 3-15 minutes. Then, remove the sample using Teflon tweezers and rinse it in clean anhydrous ethanol 2-3 times for 10-15 seconds each time, then blow dry with nitrogen. 4) For the sample obtained in 3), manually press a Φ50-80 mm rubber stopper onto 2500-4000 grit sandpaper to remove any surface powder on both sides until the sample thickness reaches the specified thickness for the XRD texture to be tested. Then, ultrasonically clean the sample in a beaker of anhydrous ethanol for 120-300 seconds to remove any surface residue. Then, blow dry with nitrogen and place it in a sample box for later use.

[0028] (2) The distance between the specified thickness layer and the surface is 1 / 2 thickness (center of the sample): 1) Take a (10~20)mm×(20~25)mm×(0.8~3)mm (thick) test sample on the non-oriented silicon steel plate, and then immerse the test sample in clean anhydrous ethanol for ultrasonic cleaning for 120~300s. After cleaning the oil stains on the surface of the sample, put it into a beaker filled with a mixture of 7%~12% hydrochloric acid and distilled water and let it stand for 10~50min. Use polytetrafluoroethylene tweezers to pick it out and immerse it in clean anhydrous ethanol for 2~3 times, each time for 10~15s. Then blow it dry with nitrogen and measure its thickness with a screw micrometer to reach 300~500μm. 2) For the sample obtained in 1), manually press a Φ50-80 mm rubber stopper onto 800-1200 grit sandpaper and polish both sides to remove surface powder until the sample thickness reaches 220-350 μm. Then, polish one side in a circular motion on 2500-4000 grit sandpaper until the sample thickness is 110-175 μm. Then, ultrasonically clean the sample in a beaker of anhydrous ethanol for 120-300 seconds to remove surface residue. Then, blow dry with nitrogen and place it in a sample box for later use.

[0029] The specific implementation of the method is described in detail below with reference to the examples, but the specific implementation of the present invention is not limited to the following examples. Example 1

[0030] Preparation of XRD texture test sample of 1 / 4 thickness layer of non-oriented silicon steel and its XRD texture results.

[0031] (1) Take a 15mm×20mm×2mm (thick) test sample from the non-oriented silicon steel plate, then immerse the test sample in clean anhydrous ethanol for ultrasonic cleaning for 150s. After cleaning the oil on the surface of the sample, place it in a beaker filled with 8% hydrochloric acid and distilled water mixture and let it stand for 20min. Use polytetrafluoroethylene tweezers to pick it out and immerse it in clean anhydrous ethanol for cleaning twice, each time for 10s. Then blow it dry with nitrogen and measure its thickness with a screw micrometer to reach 1mm+180μm.

[0032] (2) The sample obtained in (1) was manually pressed onto 500-grit sandpaper with a Φ60 mm rubber plug to remove the surface powder on both sides until the sample thickness reached 1 mm + 25 μm. The sample was then placed in a beaker of anhydrous ethanol and ultrasonically cleaned for 150 s to remove surface residues, and then dried with nitrogen.

[0033] (3) Immerse the sample obtained in (2) in a mixed solution of 50 mL of anhydrous ethanol and 4 mL of 70.0% to 72.0% perchloric acid and let it stand for 12 min. Then, pick it out with polytetrafluoroethylene tweezers and immerse it in clean anhydrous ethanol for cleaning twice, each time for 10 s, and then blow it dry with nitrogen.

[0034] (4) For the sample obtained in (3), press the Φ60 mm rubber plug lightly onto 3000 mesh sandpaper and polish off the surface powder on both sides until the sample thickness is 1 mm. Then place the sample in a beaker of anhydrous ethanol and ultrasonically clean it for 150 seconds to remove surface residues. Then blow it dry with nitrogen and put it into a sample box for use. Example 2

[0035] Preparation of XRD texture test sample of 1 / 2 thickness layer (sample core) of non-oriented silicon steel and its XRD texture results.

[0036] (1) Take a 15mm×20mm×2mm (thick) test sample from the non-oriented silicon steel plate, then immerse the test sample in clean anhydrous ethanol for ultrasonic cleaning for 150s. After cleaning the oil stains on the surface of the sample, place it in a beaker filled with a 10% hydrochloric acid and distilled water mixture and let it stand for 38min. Use polytetrafluoroethylene tweezers to pick it out and immerse it in clean anhydrous ethanol for cleaning 3 times, each time for 15s. Then blow it dry with nitrogen and measure its thickness with a screw micrometer to reach 390μm.

[0037] (2) For the sample obtained in (1), manually press a Φ60 mm rubber plug onto 1000-grit sandpaper and polish both sides to remove the surface powder until the sample thickness reaches 240 μm. Then, polish one side in a circle on 3000-grit sandpaper until the sample thickness is 120 μm. Then, place the sample in a beaker of anhydrous ethanol and ultrasonically clean it for 150 seconds to remove surface residues. Then, blow it dry with nitrogen and place it in a sample box for use.

[0038] The above description is only a specific embodiment of the present invention, but the structural features protected by the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the scope of the present invention are included in the patent scope of the present invention.

Claims

1. A method for efficiently preparing a non-oriented silicon steel layer XRD texture test sample of a specified thickness, characterized by: This includes the following two situations: (1) The distance between the specified thickness layer and the sample surface is less than 1 / 2 of the thickness of the entire sample: 1) Cut the non-oriented silicon steel sample and clean it; 2) Immerse the sample in a mixture of hydrochloric acid and distilled water for pickling, then immerse it in anhydrous ethanol for cleaning, blow it dry with nitrogen, and measure its thickness with a screw micrometer; 3) Coarsely grind the sample obtained in 2), clean it, blow it dry with nitrogen, then place it in a mixture of anhydrous ethanol and perchloric acid for chemical treatment, and finally wash it in clean anhydrous ethanol and blow it dry with nitrogen; 4) Finely grind the sample obtained in 3) on both sides and finally clean it, blow it dry with nitrogen, and place the obtained sample in a sample box for use; (2) The distance between the specified thickness layer and the sample surface is 1 / 2 of the thickness of the entire sample: 1) Cut the non-oriented silicon steel sample and clean it; 2) Immerse the sample in a mixture of hydrochloric acid and distilled water for pickling, then immerse it in anhydrous ethanol for cleaning, blow it dry with nitrogen, and measure its thickness with a screw micrometer; 3) Roughly grind the sample obtained in 2) and finely grind one side, clean it, blow it dry with nitrogen, then put it into clean anhydrous ethanol for cleaning, blow it dry with nitrogen, and put the obtained sample into a sample box for use.

2. The method for efficiently preparing a non-oriented silicon steel layer XRD texture detection sample of a specified thickness according to claim 1, characterized in that: In step 1) and step 2) of (1), a non-oriented silicon steel sample to be tested with a size of 10-20 mm × 20-25 mm × 0.8-3 mm and a thickness of 0.8-3 mm is taken from the non-oriented silicon steel plate, and then the non-oriented silicon steel sample to be tested is immersed in clean anhydrous ethanol and ultrasonically cleaned at 40-50 Hz for 120-300 seconds. After cleaning off the oil stains on the surface of the non-oriented silicon steel sample to be tested, it is placed in a beaker containing a mixture of 7%-12% hydrochloric acid and distilled water and allowed to stand for 5-40 minutes. It is then taken out with tweezers and immersed in clean anhydrous ethanol for cleaning 2-3 times, each time for 10-15 seconds. It is then blown dry with nitrogen, and its thickness is measured with a screw micrometer to determine whether it reaches the specified thickness.

3. The method for efficiently preparing a non-oriented silicon steel layer XRD texture detection sample of a specified thickness according to claim 1, characterized in that: Place the sample obtained in step 2) of step 3) of (1) between a Φ50~80mm rubber stopper and 320~600 mesh sandpaper. Press the rubber stopper lightly on both sides to polish off the loose powder on the sample surface until the sample thickness is 20~35μm thicker than the specified thickness. Then place the sample in a beaker of anhydrous ethanol and perform ultrasonic cleaning at 40~50Hz for 120~300s to remove surface residues. Then blow dry with nitrogen. Immerse the sample after rough grinding, cleaning and drying in a mixed solution consisting of 30~50mL anhydrous ethanol and 3mL~5mL perchloric acid with a concentration of 70.0%~72.0% for 3~15min. Then, pick it out with tweezers and immerse it in clean anhydrous ethanol for 2~3 times, each time for 10~15s, and then blow dry with nitrogen.

4. The method for efficiently preparing a non-oriented silicon steel layer XRD texture detection sample of a specified thickness according to claim 1, characterized in that: For the sample obtained in step 3) of step 4) of (1), press the Φ50~80mm rubber plug lightly on 2500~4000 mesh sandpaper to polish off the surface powder on both sides until the sample thickness reaches the specified thickness. Then place the sample in a beaker of anhydrous ethanol and perform ultrasonic cleaning at 40~50Hz for 120~300s to remove surface residues. Then blow it dry with nitrogen and put it into the sample box for use.

5. The method for efficiently preparing a non-oriented silicon steel layer XRD texture detection sample of a specified thickness according to claim 1, characterized in that: In step 1) and step 2) of (2), a non-oriented silicon steel sample to be tested with a size of 10-20 mm × 20-25 mm × 0.8-3 mm and a thickness of 0.8-3 mm is taken from the non-oriented silicon steel plate, and then the non-oriented silicon steel sample to be tested is immersed in clean anhydrous ethanol for 40-50 Hz ultrasonic cleaning for 120-300 s. After cleaning the oil stains on the surface of the non-oriented silicon steel sample to be tested, it is placed in a beaker of a mixture of 7%-12% hydrochloric acid and distilled water and allowed to stand for 10-50 min. It is then taken out with tweezers and immersed in clean anhydrous ethanol for cleaning 2-3 times, each time for 10-15 s. It is then blown dry with nitrogen, and its thickness is measured with a screw micrometer to determine whether it reaches the specified thickness.

6. The method for efficiently preparing a non-oriented silicon steel layer XRD texture detection sample of a specified thickness according to claim 1, characterized in that: In step 3) of (2), a Φ50-80 mm rubber plug is pressed by hand onto 800-1200 mesh sandpaper to polish off the surface powder on both sides until the sample thickness reaches 220-350 μm. Then, the plug is polished on one side in a circle on 2500-4000 mesh sandpaper until the sample thickness is 110-175 μm. The sample is then placed in a beaker of anhydrous ethanol and ultrasonically cleaned at 40-50 Hz for 120-300 seconds to remove surface residues. The sample is then blown dry with nitrogen and placed in a sample box for use.

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