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 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

How is silicon carbide obtained?

Silicon carbide (SiC) is produced from coke and quartz sand applying the Acheson process in an electric resistance furnace. When petrol coke and quartz sand are grouped around a graphite electrode and heated to a temperature of 2,000°C,

Is sample parts testing available?

MicroBlasting is extremely efficient and precise, so it is hardly likely you will need to recycle abrasive, but it is important to know the risk involved. Unlike grit or bead blasting, a MicroBlasting system can only cycle abrasive

What is fepa and what does it do?

FEPA is the Federation of European Producers of Abrasives. Its mission is to develop and publish standards, documents and comprehensive safety instructions for the abrasive industry. Abrasive grain sizes are produced and sold according to the FEPA standard,

Coarseness of the abrasive mineral:

Commonly referred to as “grit”, this number designation is determined by the amount of abrasive mineral that can pass through a mesh screen with specific size openings. Therefore, a 40 grit abrasive particle will pass through a mesh

Are you a manufacturer or trader ?

Yeah, We are the manufacturer of BFA, WFA, GC. Also,we had good business relationship with others abrasive media & refractory raw materials manufacturer . more over we have QC department which make strict inspection on goods quality, packing,

What is the d50 value?

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

Amount of abrasive applied:

This decision is made by knowing the type of material you will be working with. Open Coat – Here, the abrasive granules cover from 50% – 70% of the backing and are set at pre-determined spacing to reduce

What is your sample policy?

We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and the courier cost. 

What is a silane coating used for?

When functionalising fused alumina, a very thin layer of a silane adsorption group is applied to the fused alumina particles. This organic surface coating has the effect of better embedding and increased scratch resistance in a melamine resin

What is silicon carbide?

Silicon carbide is a chemical compound of silicon and carbon and belongs to the group of carbides. The chemical formula is SiC.Silicon carbide is at the same time the hardest and lightest ceramic material and is also highly

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.

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

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,

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