Brown Fused alumina isΒ a product manufactured by gradual melting reduction of calcined bauxite in an electric arc furnace at high temperature (approximately 2000 degrees Celsius). Its chemical composition consists mainly of Al2O3Β (94,5-97%) and vestigal amounts of TiO2, SiO2, Fe2O3, CaO and MgO.
Brown Aluminium Oxide is characterised by good toughness, high mechanical resistance and hardness (9 in Mohs scale). The microhardness of the material reaches about 1900kG/mm2. Specific gravity (density) equals 3,90+/-0,05 g/cm3. Bulk density depending on size equals 1,52-1,87 g/cm3. It has relatively high thermal conductivity and low thermal expansion. As regards electricity it is an insulator.
| Brown fused alumina JIS 360# | |
| ChemicalΒ Composition | Percentage |
| Al2O3 | β₯94.0% |
| Fe2O3 | β€0.5% |
| Na2O | β€0.30% |
| SiO2 | β€1.50% |
| TiO2 | 1.5-3.8% |
| CaO | β€0.30% |
| Physicochemical Index | |
| Bulk density | 1.53-1.99g/cm3 |
| Grain density | 3.90 g/cm3 |
| Morse hardness | 9 |
Brown Fused Aluminum Oxide PowdersΒ are the perfect material specifically manufactured to be used for general abrasive applications in bonded abrasive tools and lapping and polishing processes. While aluminum oxide has lower hardness and abrasive capacity than diamond, boron carbide, and silicon carbide, it is widely used for grinding ferrous materials, finishing tough and hard materials, filling up ceramic parts when the processing cost is important.
| Item | D0οΌumοΌ | D3(um) | D50(um) | D94(um) |
| #240 | οΌ127 | οΌ103 | 57.0Β±3.0 | οΌ40 |
| #280 | οΌ112 | οΌ87 | 48.0Β±3.0 | οΌ33 |
| #320 | οΌ98 | οΌ74 | 40.0Β±2.5 | οΌ27 |
| #360 | οΌ86 | οΌ66 | 35.0Β±2.0 | οΌ23 |
| #400 | οΌ75 | οΌ58 | 30.0Β±2.0 | οΌ20 |
| #500 | οΌ63 | οΌ50 | 25.0Β±2.0 | οΌ16 |
| #600 | οΌ53 | οΌ41 | 20.0Β±1.5 | οΌ13 |
| #700 | οΌ45 | οΌ37 | 17.0Β±1.5 | οΌ11 |
| #800 | οΌ38 | οΌ31 | 14.0Β±1.0 | οΌ9.0 |
| #1000 | οΌ32 | οΌ27 | 11.5.Β±1.0 | οΌ7.0 |
| #1200 | οΌ27 | οΌ23 | 9.5Β±0.8 | οΌ5.5 |
| #1500 | οΌ23 | οΌ20 | 8.0Β±0.6 | οΌ4.5 |
| #2000 | οΌ19 | οΌ17 | 6.7Β±0.6 | οΌ4.0 |
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