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Silicon carbide abrasive wheels are an ideal choice for grinding low tensile strength materials like metals and nonmetallics, yet can be more challenging to control than aluminum oxide abrasives due to razor-sharp grains that cut glass, plastic and medium density fiberboard easily but cannot cut harder materials such as metal or hardwood.

Twardość

Silicon carbide, measuring 9.5 on Mohs’ scale of hardness, is one of the hardest common abrasive grains and an ideal choice for hard materials sanding or polishing due to its sharp edges and friable nature. Due to its long life and recyclability, this material works particularly well on metals like titanium, stainless steel, armored aluminum but can struggle when working with more delicate surfaces like glass and marble.

Other abrasives, like aluminum oxide or cBN, do not offer as long-lasting cutting performance or longevity; their lack of fracture toughness makes zirconia the superior choice when grinding through harder materials like tempered steel; its durable nature also makes it the optimal option when dealing with aluminum, iron and soft bronze materials. The first letter in each wheel specification usually indicates what grain type it contains: A stands for aluminum oxide abrasives such as aluminum oxide; B refers to cBN; C shows silicon carbide while Z signifies zirconia abrasives – each manufacturer will offer different lists based on manufacturers’ listings; however

Grit

Grit size refers to the size and bond strength of individual abrasive particles bound together, with larger particles having greater granularity and therefore being better suited to rough grinding of soft materials, while smaller particles tend to cut faster with increased sharpness and cutting speed. Adhesion bonds hold these particles securely within their wheels – vitrified or resinoid bonds being commonly employed with grinding wheels.

Sol Gel Alpha Alumina Abrasives have historically been difficult to use with alumina-coated wheels due to corner holding bonds containing alumina that react with its grit, oxidizing it and leading to excessive shrinkage of wheel structures. A new alumina-free bond, as disclosed herein, offers improved mechanical strength and resistance against form loss, providing an easier method of grinding metals and hard materials than with traditional bond materials containing alumina such as Kentucky Ball Clay No. 6, Nepheline Syenite or Flint; these bonds can also be fired at lower temperatures so as to avoid reacting with its grit counterpart.

Bond

Bond refers to the strength of materials that hold together abrasive grains on a wheel, and various kinds of bonds are used for creating different abrasive wheels which perform best for particular materials or applications.

Aluminum oxide, also known as corundum, is a popular bonded abrasive used for grinding ferrous metals and nonferrous materials like ceramics. Additionally, this substance can often be found sharpening carbide tools.

Green silicon carbide, a harder and more brittle material than corundum, is often employed in vitrified bonded points and wheels for grinding low-tensile strength nonferrous metals like cemented carbide as well as hard brittle materials such as cemented carbide.

An abrasive material is formed into its desired form through a special grinding process and held together using either resin or vitrified bonds. Depending on its grain and bond strength/stiffness, an abrasive is classified either hard or soft; generally speaking, hard grades work better on harder materials while soft grades perform best against soft substances.

Porosity

Porosity of an inventive wheel is an integral component to its performance, as evidenced by its grinding test on etched silicon wafers: stable peak normal forces over two hundred wafer grinding cycles while minimising both thermal and mechanical damage to workpiece.

Contrasting with conventional resin-bonded wheels, an invented wheel displayed extremely favorable grinding characteristics for backgrinding the etched wafers to produce fine finish backgrounds with relatively constant peak normal forces and no sudden increases. In contrast to these results, a conventional resin-bonded comparative wheel produced an unacceptably rapid rise in peak normal force that rendered them unusable. In contrast, during the same experiment the conventional comparative wheel resulted in continuous, rapid increases in peak normal force which rendered their workpiece unusable; conversely during same experiment while in comparison, conventional comparative wheels showed continuous, rapid increases in peak normal force that eventually rendered them unusable; by contrast, in comparison, during same experiment the invented wheel produced highly desirable grinding characteristics which produced fine finish background while having low, consistent peak normal force increases.

This abrasive wheel features green silicon carbide grains of 60-grit size and a vitreous bond made up of raw materials such as Kentucky ball clay no. 6 clay, nepheline syenite, flint and glass frit. Ideally, its maximum firing temperature should not exceed 1100deg C; its pore volume can be controlled using hollow ceramic spheres that react preferentially with its components while saving silicon carbide grains from oxidation during firing.