Refractory Calcined Aluminum Oxide Powder , High Purity Alpha Alumina Powder
High Purity And Conversion Rate Calcined Alumina Powder 99.5% For Electronic Applications
1. Calcined Alumina Powder Introduction
Calcined (or alpha) alumina is made by roasting a source alumina powder at 1200-1300C to convert it to pure Al2O3 (when calcined near 2000C large hexagonal, elongated tablet shaped crystals form as "Tabular Alumina"). The alpha form is the densest and most stable crystalline form of alumina. It is insoluble in water but is soluble in hydrofluoric acid and potassium bisulfate. Unground calcined aluminas are typically 100-300 mesh, but much finer grades (often called "Ground Alumina") are produced by milling. Calcined aluminas are available in numerous grades based on the heat treatment applied, crystal size, soda content, and degree of thermal conversion to alpha phase. Soda content is a major factor in determining the final use (low soda materials are used for electronic applications, medium soda for electrical insulation and porcelains, high soda for glass, glaze, fiberglass and electrical porcelain).
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
3. Calcined Alumina Powder Characteristics
- Excellent strength.
- High Alumina content.
- High volume density.
- Physicochemical stability.
- Fully calcined.
- Low Dust content.
4. Calcined Alumina Powder Particle Sizes Distributions
5. Calcined Alumina Powder Applications
1.Ceramic grade alumina (CA) series products,
2.Refractory level alumina (RA) series products,
3.LCD glass (Special glass) Alumina (SA) series products,
4.Alumina (PA) series products for polishing, filler
5.Calcined Low-Sodium Alumina Coarse Powder (HA) Series
6. Ceramic granulation powder and Ceramic Insulators for Spark plugs
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