When preparing metallographic samples, cutting a small piece from a larger material is necessary to obtain a representative cross-section without causing structural changes. Various factors influence the ideal cut, including the abrasive, the bond agent, and the wheel thickness. Abrasives such as silicon carbide and aluminum oxide are commonly used and bonded with the bonding agents.
Cut-off wheels are made of abrasive particles bonded with a resin, a resin/rubber, or a rubber matrix. These wheels continuously expose sharp, new abrasive particles as they wear down. The “Soft” wheel is best suited for cutting hard and brittle materials, while the “Hard” wheel is more appropriate for soft and ductile materials.
Cut-off wheels with aluminum oxide as the abrasive are preferable for cutting ferrous samples, alloys, and most other metals. Silicon carbide is recommended for non-ferrous and non-metallic materials.
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