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1.Abrasive coating of resin bonded grinding wheel
Super hard abrasive coatings are most commonly used on resin-bonded grinding wheels, while nickel and copper are the preferred coating materials. Coating thickness depends on coating material. Copper coating usually accounts for 50 % of the total weight of coated abrasive particles. Nickel coatings accounted for 30, 56 or 60 percent of the total weight of the coated grains. The 56 nickel coating has a stronger grain holding force (longer holding time), but it also generates more heat. Silver can also be used as a grainy coating for resin-bonded grinding wheels, which, despite its high cost, has the desired lubrication properties. The silver-coated super hard grinding wheel is mainly used to grind the spiral groove of the cemented carbide drill bit.
2.Abrasive coating of metal and vitrified bonded grinding wheel
The coating used for metal-bonded grinding wheels is metal-carbide base coating. The most common coating materials are titanium carbide and chromium carbide. The metal-carbide-based coating can also protect diamond abrasive particles from adverse reactions between abrasive particles and binder that may occur during grinding wheel manufacturing. The super hard abrasive coating in the ceramic bonding wheel is titanium, In the metal-bonded grinding wheel, the coating protects the diamond grain from the influence of the bond system. In ceramic bond grinding wheel, coating is to protect the bond system from the influence of CBN abrasive particles. Coating on the abrasive particles with titanium carbide coating can effectively improve the wettability of the abrasive particles and increase the control force.
3.Defects of abrasive coatings
The only potential drawback to using coated abrasive super abrasive wheels may be the increased cost. In most cases, grain-coated super hard abrasive wheels perform better than uncoated wheels (although there are exceptions). If the grinding wheel manufacturer does not improve the binder to take full advantage of the coating's performance, the end user may not be able to see the difference between coating and non-coating when the binder and coating are designed as an integral system for the best results.
