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In most cases, abrasive-coated superabrasive wheels perform better than uncoated wheels, and the standard cut off wheel for metal best results are obtained when the bond and coating are designed as a unitary system.

Grinding wheels using silicon carbide coatings as new metal bonders are a more economical alternative to many conventional bond materials. The coating effectively enhances the abrasive holding power. The superabrasive coating used in ceramic bond grinding wheels exhibits the same advantages as used in metal bond grinding wheels: helping to control potentially harmful chemical reactions between abrasive particles and ceramic binders.

Titanium is also a typical material for such superabrasive coatings, which help to mitigate the undesirable chemical reactions that can occur in the binder. Coating the titanium carbide coating on the abrasive particles can effectively improve the wettability of the abrasive grains and increase the holding power. In metal bond grinding wheels, the coating protects the diamond abrasive particles from the binder system; in ceramic bond grinding wheels, the coating protects the binder system from CBN abrasive particles.

Selection of abrasive coating

So how do end users know if they should buy a coated or uncoated superabrasive wheel?

The end user shares information about the use of the grinding wheel with the grinding wheel supplier, such as what kind of processing the grinding wheel is used for and the type of bonding agent used, in order to recommend the appropriate coating concentration or coating material to the user. The first thing to consider is the workpiece material, whose properties determine the type of abrasive used. The grinding wheel manufacturer needs to know the hardness of the workpiece material and whether it belongs to the iron family material or the non-ferrous material to determine whether the diamond abrasive grain or the CBN abrasive grain should be selected. Wheel manufacturers also need to understand the surface quality requirements of the workpiece and the material removal rate during processing. The type of abrasive material must be selected, then the specific type of material must be determined, and the size of the grinding wheel and the bonding agent should be designed. On this basis, consider whether a coating is needed.