How To Choose Metallographic Sandpaper And Diamond Grinding Disc For Rough Grinding？

In the big family of metallographic consumables, there are many consumables with the same functions and consumables, such as metallographic sandpaper and diamond grinding discs. These two consumables are used for rough grinding of samples. These two functions are the same, so how to choose?

In the preparation of metallographic samples, in addition to cutting and inlaying, the most critical step is probably the grinding and polishing process. In the case that the cutting does not produce deep, irremovable defects, the mosaic is also reasonable, so the key is to grasp the grinding and polishing process. In the case of skilled sample preparation, the quality of sample preparation depends on whether the consumables selected for each grinding and polishing process are appropriate. As metallographic sandpaper and diamond grinding disc are both used for rough grinding process, there are still differences in application between the two. If you understand these differences, you can choose them appropriately.

The diamond grinding discs, the grinding particles are diamond, the particle size is from 240μm-6μm, it is especially suitable for the preparation of samples of materials with hardness higher than 150HV, such as ceramics, glass, thermal sprayed metal coatings, cemented carbide and other high hardness or superhard materials. A diamond grinding disc can replace at least 100-200 sheets of silicon carbide metallographic sandpaper. At this time, the advantages of diamond grinding discs can be reflected. Usually, when using diamond grinding discs for rough grinding, different from using metallographic sandpaper, at least 2 to 3 grades of metallographic sandpaper grinding processes are required, and one step is enough. And, as always, high removal rates, wear resistance and long service life with good grinding performance make it easy to obtain samples with perfect edge retention and flatness! This is the application characteristic of diamond grinding discs.

Silicon carbide metallographic sandpaper, the abrasive particles are silicon carbide particles, and the particle size is from 260μm to 5μm. For materials with hardness lower than 150HV or slightly harder materials with good ductility, silicon carbide metallographic sandpaper is still the best choice for rough grinding. Proper selection, fast material removal, and a uniform surface finish is all it takes.

To sum up, compared with diamond grinding discs, the application of metallographic sandpaper in rough grinding depends on the hardness of the material. The preparation of material samples with a hardness range above 150HV is suitable for diamond grinding discs, and the hardness range is below 150HV, or Metallographic sandpaper is best used for sample preparation of materials with high hardness but good ductility.

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