One of the mentors of the editor is a professor from the School of Materials at a certain university. He has been engaged in teaching and researching metal materials for many years. The old professor's years of laboratory experience are like an endless treasure, and no matter what problems you encounter with metal material sampling, you can find simple and effective solutions here.

    My user's laboratory mainly conducts metallographic analysis of lead, tin, and zinc. These low melting point metals are relatively soft and difficult to prepare. Usually, the sample preparation process is to use silicon carbide metallographic sandpaper for grinding, which is also a traditional preparation process. Starting from the grinding of silicon carbide metallographic sandpaper with particle size P400, followed by the grinding of metallographic sandpaper with particle size P600, P1200, P1500, and then 1 μ Coarse polishing of m alumina, using 0.05 later μ There are no problems with the precision polishing process of m alumina, but it is often troubled by the embedding of abrasive particles in the metallographic sandpaper grinding process, which has not been well solved. This brings a lot of trouble to the sample preparation work, delays a lot of time, and seriously affects work efficiency.

    With this question in mind, I went to the old professor's office specifically to seek advice. Can you guess what kind of clever trick the old professor gave me? It almost doesn't cost much money, as long as you have a small piece of paraffin or candle, you can solve the problem, really? The time has come to witness miracles: