陶瓷磨料
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SGK2 (Bonded Abrasives)
TREIBACHER ALODUR® SGK2 abrasive grain is manufactured by a sol-gel process. It can be described as a composite of nano sized corundum which is surrounded by platelets of a rare earth aluminate. This microstructure results in a unique aggressive grinding performance, which combines the high toughness and high hardness of the grain with the ability of optimised self-sharpening. This special SGK2 abrasive grain structure allows in all applications and most varied pressure ranges a universal usage at highest cutting rates and longest tool lifetime.
Properties：
| Colour | Blue |
| Mineralogy | α- Al₂O₃; Mg(La,Y)Al₁₁O₁₉ |
| Hardness | 20Gpa |
| Density* | 3,90 ±0,3 g/cm³ |
| Grain shape | Angular |
| Toughness | High |
* He Pyknometer
Chemical analysis in wt. %: *)：
| SGK2 | Al₂O₃ | MgO | La₂O₃ | Y₂O₃ | CaO,Fe₂O₃,CoO,TiO₂ |
|---|---|---|---|---|---|
| % | 94-95 | 1-1,4 | 2,4-3,0 | 1,4-1,8 | Traces |
*) XRF analysis in wt.%
Application：
Bonded Abrasives: Creep feed grinding (e.g. turbine blades), Roll grinding, External and Internal cylindrical grinding (ball bearings, camshafts), Profile grinding, Spring grinding.
Grits available:
TREIBACHER ALODUR® SGK2 is available in grits F14 - F220, sized in accordance to the FEPA sieving standard as specified on page 2.
Bulk density (g/cm³) *):
| Grit | SGK2 | Grit | SGK2 |
|---|---|---|---|
| 14 | 1,70 - 1,85 | 60 | 1,75 - 1,90 |
| 16 | 1,70 - 1,85 | 70 | 1,75 - 1,90 |
| 20 | 1,70 - 1,85 | 80 | 1,75 - 1,90 |
| 22 | 1,80 - 1,95 | 90 | 1,70 - 1,85 |
| 24 | 1,80 - 1,95 | 100 | 1,70 - 1,85 |
| 30 | 1,80 - 1,95 | 120 | 1,70 - 1,85 |
| 36 | 1,80 - 1,95 | 150 | 1,70 - 1,85 |
| 40 | 1,80 - 1,95 | 180 | 1,70 - 1,85 |
| 46 | 1,80 - 1,95 | 220 | 1,70 - 1,85 |
| 54 | 1,75 - 1,90 |
Packaging:
TREIBACHER ALODUR® SGK2 is available in 25 kg paper bags. Other packaging types are available at extra charge.
Grit size distribution of FEPA grades：
| Sieve 1 | Sieve 2 | Sieve 3 | Sieve 3+4 | Sieve 3+4+5 | Pan | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| μm | % | μm | Max% | μm | Min% | μm | Min% | μm | % | Max% | |
| F14 | 2360 | 0 | 1700 | 20 | 1400 | 45 | 1180 | 70 | 1000 | n.d. | 3 |
| F16 | 2000 | 0 | 1400 | 20 | 1180 | 45 | 1000 | 70 | 850 | n.d. | 3 |
| F20 | 1700 | 0 | 1180 | 20 | 1000 | 45 | 850 | 70 | 710 | n.d. | 3 |
| F22 | 1400 | 0 | 1000 | 20 | 850 | 45 | 710 | 70 | 600 | n.d. | 3 |
| F24 | 1180 | 0 | 850 | 25 | 710 | 45 | 600 | 65 | 500 | n.d. | 3 |
| F30 | 1000 | 0 | 710 | 25 | 600 | 45 | 500 | 65 | 425 | n.d. | 3 |
| F36 | 850 | 0 | 600 | 25 | 500 | 45 | 425 | 65 | 355 | n.d. | 3 |
| F40 | 710 | 0 | 500 | 30 | 425 | 40 | 355 | 65 | 300 | n.d. | 3 |
| F46 | 600 | 0 | 425 | 30 | 355 | 40 | 300 | 65 | 250 | n.d. | 3 |
| F54 | 500 | 0 | 355 | 30 | 300 | 40 | 250 | 65 | 212 | n.d. | 3 |
| F60 | 425 | 0 | 300 | 30 | 250 | 40 | 212 | 65 | 180 | n.d. | 3 |
| F70 | 355 | 0 | 250 | 25 | 212 | 40 | 180 | 65 | 150 | n.d. | 3 |
| F80 | 300 | 0 | 212 | 25 | 180 | 40 | 150 | 65 | 125 | n.d. | 3 |
| F90 | 250 | 0 | 180 | 20 | 150 | 40 | 125 | 65 | 106 | n.d. | 3 |
| F100 | 212 | 0 | 150 | 20 | 125 | 40 | 106 | 65 | 75 | n.d. | 3 |
| F120 | 180 | 0 | 125 | 20 | 106 | 40 | 90 | 65 | 63 | n.d. | 3 |
| F150 | 150 | 0 | 106 | 15 | 75 | 40 | 63 | 65 | 45 | n.d. | 3 |
| F180 | 125 | 0 | 90 | 15 | 75 | n.d. | 63 | 40 | 53 | Min. 65 | n.d. |
| F220 | 106 | 0 | 75 | 15 | 63 | n.d. | 53 | 40 | 45 | Min. 60 | n.d. |
*) Rotap sieving analysis according to FEPA Standard 42-1-2006