High Purity Alumina Powder , White Aluminium Oxide Powder For Refractory Binder
High Purity And Conversion Rate Calcined Alumina Powder 99.5% For Refractory Binder
1. Calcined Alumina Powder Introduction
Calcined alumina is aluminum oxide that has been heated at temperatures in excess of 1,050 °C (1,900 °F) to drive off nearly all chemically combined water. In this form, alumina has great chemical purity, extreme hardness (9 on the Mohs hardness scale, on which diamond is 10), high density, and a high melting point (slightly above 2,050 °C [3,700 °F]). It possesses good thermal conductivity, heat and shock resistance, and high electrical resistivity at elevated temperatures. This combination of properties makes calcined alumina useful in abrasives, glass, porcelains, spark plugs, and electrical insulators, but the greatest quantity of calcined alumina is used to obtain aluminum.
2. Calcined Alumina Powder Specifications
| Type | Median sodium | Low sodium | ||||||
| Brand | EK-4M | EK-12M | EK-SF | EK-06L | ||||
| composition% | Guarantee value | Typical value | Guarantee value | Typical value | Guarantee value | Typical value | Guarantee value | Typical value |
| AL2O3 | ≥99 | 99.37 | ≥99 | 99.34 | ≥98.5 | 99.08 | ≥99 | 99.34 |
| SiO2 | ≤0.2 | 0.10 | ≤0.2 | 0.12 | ≤0.2 | 0.10 | ≤0.2 | 0.11 |
| Fe2O3 | ≤0.2 | 0.06 | ≤0.2 | 0.08 | ≤0.2 | 0.13 | ≤0.2 | 0.08 |
| Na2O | ≤0.3 | 0.25 | ≤0.25 | 0.18 | ≤0.25 | 0.13 | ≤0.25 | 0.10 |
| True density g/cm3 | ≥3.95 | 3.96 | ≥3.92 | 3.94 | ≥3.92 | 3.94 | ≥3.92 | 3.95 |
| Median particle diameter D50μm | 3~5 | 3.47 | 0.9~1.5 | 0.93 | 1.5~2.5 | 1.66 | 0.9~1.5 | 1.13 |
| α-AL2O3 inversion ratio % | ≥95 | ≥95 | ≥95 | ≥95 | ||||
| Particle distribution | Unimodal | Unimodal | Bimodal | Bimodal | ||||
| Inspection standard | GB/T3044-89；GB3604-83 | |||||||
3. Calcined Alumina Powder General Advantages
- Good volume stability.
- unique high sintering activity.
- Good brightness,
- Good finishing.
- High conversion rate.
- High Purity 99.5-99.8%
3. Calcined Alumina Powder Characteristics
1. High Hardness
2. High Compression Strength
3. Abrasive / Wear-Resistance
4. Chemical Inertness
5. High Degree of Refractoriness
6. Superior Electrical Insulating Properties
7. Resistance to Thermal Shock
8. High Melting Point
4. Calcined Alumina Powder Particle Sizes Distributions
5. Calcined Alumina Powder Applications
1. Polishing
2. Structural Ceramics
3. Technical Ceramics
4. Body and Vehicle Armor
5. Lapping
6. Laminates
7. Coatings
8. Filtration
9. Abrasives
10. Refractory
11. Milling
12. Filler
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