3.2 Corundum
Corundum is considered to be the most important synthetic abrasive and does not contain iron. It consists, among other things, of aluminium oxide and silicon dioxide. Silicic acid only exists in bounded form. Because it can be produced with different Al2O3–contents – by this the hardness can be varied – it can be used for different kinds of work. Furthermore, corundum is supplied in various qualities. Difference is made between an inexpensive regenerate, electro corundum and expensive high grade corundum.
Corundum can be used for recycling uses. Due to its hardness normal corundum of medium quality can be used about 20 – 25 times in rotation. This reduces the necessary amount of abrasives to about 1/20 compared to slag abrasives. Also after several runs the angular corundum does not lose its shape. Due to its geometry it is not suitable for applications in shot-blasting wheels.
- Table of contents
- 1. Fields of application of abrasive blasting technology
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2. Blasting technology
- 2.1 Airless blast cleaning
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2.2 Injection blasting
- 2.2.1 Compressed air blasting (also air blast cleaning or sand blasting)
- 2.2.2 Pressure blasting (injector blasting)
- 2.2.3 Vacuum-compressed-air blasting and vacuum injection blasting
- 2.2.4 Damp blasting
- 2.2.5 Wet blasting
- 2.2.6 Slurry blasting
- 2.2.7 Ice Blasting
- 2.2.8 Water- jetting cleaning and hydro-jetting
- 2.2.9 Wet blasting for fine surface treatment
- 2.2.10 Combination of different blasting methods
- 2.3 Laser cleaning
- 3. Abrasive
- 4. Efficiency assessment of abrasive blasting
- 5. Influence of compressed-air blasting on the surface of the workpiece
- 6. Generation of compressed air
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7. Plants for compressed-air blasting
- 7.1 Small and medium-sized blasting pots
- 7.2 Large blasting pots
- 7.3 Double-chamber blasting pot
- 7.4 Mixing and dosing valve
- 7.5 Hoses, lengths of hoses, couplings
- 7.6 Selection of a blasting pot in considering the wear and tear behaviour
- 7.7 Increased wear and tear at the blasting pot caused by wrong adjustment
- 8. Remote control and emergency shut-downs
- 9. Jet nozzles
- 10. Stationary blasting halls
- 11. Mobile abrasive blasting equipment
- 12. Laws and provisions