Metallographic sandpaper is mainly used in quality control laboratories, physical laboratories, and materials metallographic laboratories of major enterprises, universities, and research institutions to perform destructive metallographic analysis and grinding of various types of materials. The widely used consumables in the field of metallographic sample preparation are probably metallographic sandpaper, which belongs to the general metallographic grinding and polishing consumables! Almost all materials can be ground with metallographic abrasive paper. However, when metallographic sandpaper encounters hard alloys, it becomes ineffective, especially when encountering hard alloys with a hardness between 69-80HRC. No matter how persistent the metallographic sandpaper is, it has to choose to give up and leave the field in despair, giving up the opportunity to diamond grinding discs.

    Why is this?


The first and second grinding media are different: metallographic sandpaper mostly uses grinding particles such as silicon carbide, alumina, and mixed abrasives as grinding media; The diamond grinding disc uses diamond as the grinding medium, which has stronger grinding ability and better wear resistance.


Secondly, different manufacturing processes: Metallographic sandpaper uses a sand planting process to bond grinding medium particles onto a waterproof paper base. The quality of the binder and the level of process control directly affect the grinding ability and wear resistance of metallographic sandpaper. Diamond grinding discs are bonded to a special material substrate using resin, resulting in a more uniform and dense distribution of medium particles.


Thirdly, the application is different. Metallographic sandpaper is suitable for grinding and polishing general hardness materials. For hard alloys, especially high hardness hard alloys and other materials, metallographic sandpaper appears powerless, and the grinding effect cannot be compared to diamond grinding discs. The diamond grinding disc is specially designed and manufactured for such hard materials as hard alloy, Thermal spraying coating, carburizing steel, etc. The harder the material is, the more powerful the diamond grinding disc can be used to give play to its advantages of super grinding ability and excellent edge maintenance. In a word, it's called&quo; Diamond grinding discs have high speed removal, excellent edge retention, and surface smoothness;


Therefore, when metallographic sandpaper encounters hard materials such as hard alloys, there is only one choice, give up! Diamond grinding discs with stronger grinding ability and greater wear resistance have made their debut!

    Experience tells us that using a diamond grinding disc to grind hard alloys is indeed very effective. Modern metallographic precision cutting machines are relatively advanced, and the surface of the cut samples is very flat and smooth. Usually, rough grinding steps are not required, and diamond grinding discs can be directly used to prepare metallographic samples. Regarding this, metallographic sample preparation experts in the United States have provided the preparation procedures for the above two plans for your reference!


Therefore, when you prepare samples of hard materials such as cemented carbide, Thermal spraying coating and carburized steel, don't forget to replace the metallographic abrasive paper with a diamond grinding disc, which will make it easier to obtain an ideal grinding and polishing surface with better edges and flatness. Remember!