Why is corundum or silicon carbide used?

Corundum is the most frequently used abrasive. The purer the corundum, the harder it also is, which can be determined from the colour. The toughness can be increased by adding various metal oxides and by shortening the cooling process in production.
The following distinctions are made:

Brown fused alumina
with more than 94% Al2O3 (aluminium oxide) is e.g. used to treat steel castings and cast iron. Its toughness permits especially high pressing forces.

White fused alumina consists of more than 99.9% Al2O3
Due to its hardness and thermal resistance up to 2,000°C, white fused alumina is suitable for tough steel types (tool steel), for grinding and polishing glass as well as for all steel types requiring cool grinding.

A very important field of application for the ultrapure white fused aluminas are varnishes and coatings, particularly powder and UV coatings, in which they enhance the scratch-resistance of furniture surfaces, worktops and floors. Fused alumina is most effective in ramps and highly wear-resistant industrial floors.

Semi-friable fused alumina with approx. 97% Al2O3 (aluminium oxide) is classified between brown fused alumina and white fused alumina due to its technical properties. It is less tough than brown fused alumina, but has a higher cutting quality.

Pink fused alumina gets its characteristic colour when chromium oxide is added to melt. It has a slightly higher grain toughness. Its higher edge stability makes it possible for use in form and profile grinding; otherwise it is identical to white fused alumina. Due to its hardness, fused alumina is often added to surfaces to protect them against wear (e.g. in varnishes and laminates).

Ruby fused alumina has further metal oxides added to it, particularly Cr2O3 (chromium(III) oxide). This results in maximum toughness making ruby fused alumina suitable for the grinding of high-alloy steel types.

Silicon carbide is heat-resistant up to approx. 1,600°C and contains hard, sharp-edged crystals. One abrasive grain usually only consists of a single or a few crystals. Compared with fused alumina, SiC is harder and more brittle. There are many fields of application, ranging from conventional blasting agents to hard concrete aggregates which make industrial floors abrasion-resistant and conductive and vaults particularly durable. It is used in engineering ceramics due to its low weight and low thermal expansion. In addition, SiC is a semiconductor and is used in the manufacture of blue LEDs, for example. SiC also produces a very pronounced glitter effect in dark colours (e.g. façades, plaster).

Higher-quality green silicon carbide is primarily used to treat glass, china, marble, gemstone, artificial stone, for precision treatment of light and non-ferrous metals as well as leather.

More Questions

What is the hardness?

Hardness is rated from A-Z with ‘A’ being the weakest bond and ‘Z’ being the strongest.  A weak bond is preferred for grinding harder materials while  a stronger bond is desired for softer materials.  A typical weak bond

What is grit size?

Grit size typically runs from coarse (16 -24 grit), medium (36 – 60 grit) and fine (80-120 grit).  Superfine grits run from 150 and higher.  Grinding wheels usually will be between 24 and 100 grit.  Honing stones and

Form and shape of the abrasive:

This decision is made by determining how the abrasive will be used by the individual. Abrasives are sold in forms such as sheets, large/small discs, belts, and large/small rolls. Selecting the right form is determined by whether the

What is corundum?

Corundum is a mineral from the category of oxides and hydroxides and is the most frequently used industrial mineral worldwide. It also occurs naturally as a gemstone (sapphire, emerald, ruby). Chemically corundum is aluminium oxide with the chemical

What is porosity?

Porosity is defined as the gas proportion (cavity volume) of a particle’s total volume. It can be determined using different measurement techniques, such as gas adsorption and mercury porosimetry. With the same grain size and shape, a lower

What is the specific weight?

The specific weight is the ratio of the weight of a body to its volume. The specific weight of corundum under normal conditions is 3.94 g/cm3.

How is fused alumina obtained?

Raw materials containing aluminium oxide are electrothermally melted at a reaction temperature of more than 2,000 °C to produce the various fused aluminas. Different starting materials are used depending on the desired type of fused alumina. For instance,

How about your delivery time?

Generally, it will take 30 to 60 days after receiving your advance payment. The specific delivery time depends .on the items and the quantity of your order.

What is your terms of payment?

T/T 30% as deposit, and 70% before delivery. We’ll show you the photos of the products and packages .before you pay the balance.

What is melting vs. Sintering?

When processing minerals in a furnace, materials can either be melted or sintered.  When materials are melted during the production process the minerals go from a solid state, to a liquid state, then is re-solidified during the cooling process

What is the d50 value?

The d50 indicates the mean particle size. d50 means that 50% of particles fall within the specified grain size.

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