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Abrasive coating solves three outstanding problems

In the application of uncoated superabrasive (diamond and CBN) grinding wheels, there are three increasingly prominent problems: insufficient abrasive holding power, insufficient abrasive particle protection, and poor chemical reaction between the abrasive particles and the binder. The use of superabrasive coating technology helps solve these three problems, which improves the grinding performance of the grinding wheel. The technique is to apply a metal-based coating to the superabrasive grains before the abrasive particles are combined with the binder material and form the high performance cutting disc

The primary purpose of the abrasive coating is to hold the abrasive particles more firmly in the binder. The actual increase in grip depends on the type of coating and is related to the binder system itself. For example, nickel-based coatings are commonly applied to superabrasive granules of resin bond grinding wheels, which increase the holding force by increasing the surface area between the coated abrasive particles and the binder, thereby increasing the mechanical adhesion between the two. This helps prevent the abrasive particles from peeling off prematurely from the binder, thus extending the life of the wheel.

Abrasive coating of resin bond grinding wheel

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Superabrasive coatings are most commonly used on resin bond wheels, while nickel and copper are the preferred coating materials. Nickel is the most commonly used coating material because it is relatively inexpensive and easy to coat. Copper coatings are generally used in dry grinding because of their excellent heat dissipation in the grinding zone.
The thickness of the coating depends on the coating material. The copper coating typically accounts for 50% of the total weight of the coated abrasive particles; the nickel coating accounts for 30% or 56% of the total weight of the coated abrasive particles.

Abrasive coating of metal and ceramic bond grinding wheel

The coating for the metal bond grinding wheel is a metal-carbide based coating, which means that the carbide is formed during the deposition of the coating. The most common coating materials are titanium carbide and chromium carbide. These coatings perform extremely well in enhancing abrasive grip because chemical bonds are formed at the abrasive/coating interface and metal bonds are formed at the coating/bonding interface.
As noted above, in addition to enhancing abrasive grip, the coating provides other benefits. The metal-carbide-based coating also protects the diamond abrasive particles from the undesirable reaction of abrasive particles and binders that may occur during the manufacture of the wheel. Since the process temperature for processing the metal bond metal powder is much higher than the process temperature for processing the resin bond, at high temperatures, certain elements in the bond etch the diamond abrasive particles, making the abrasive particles fragile and ultimately Reduce the life and grinding performance of the grinding wheel.

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