Na2O <0.1% Electrically Fused White Corundum Powder 400 Mesh 500 Mesh for Fine Alumina Ceramics
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Fused White Alumina Powder with Na?O Content Less Than 0.1%, 400 Mesh and 500 Mesh for Fine Alumina Ceramics
High-purity low-sodium white alumina micropowder has a sodium oxide content below 0.1% and very low silicon-iron impurity levels. It is processed from high-purity fused white alumina through crushing, chemical treatment, water washing and overflow, sedimentation, and drying. The alpha-phase conversion rate of high-purity low-sodium white alumina exceeds 97%, with a higher specific gravity than medium-sodium white alumina, high bulk density, low porosity, high refractory stability, strong high-temperature hardness, low thermal shrinkage and expansion, and excellent thermal stability. It can be used not only in traditional applications such as abrasives, grinding tools, and wear-resistant materials but also in advanced alumina ceramics, high-temperature coatings, precision casting, and other industries.
Characteristics of Fused White Alumina Powder with Na?O Content Less Than 0.1%, 400 Mesh and 500 Mesh for Fine Alumina Ceramics:
1. High bulk density, good compactness, and low porosity.
2. High corundum phase content, high hardness, and excellent high-temperature strength.
3. High refractory temperature and strong high-temperature stability.
4. Low high-temperature thermal expansion coefficient and strong volume stability.
5. Good chemical stability, resistant to acid and alkali corrosion.
6. High particle concentration uniformity, consistent particle size, and good flowability.
7. Neutral pH and low electrical conductivity.
Typical Chemical Indicators of High-Purity Low-Sodium White Alumina Micropowder:
Chemical Composition | Percentage |
|---|---|
Alumina Al?O? | 99.6160% |
Silicon Dioxide SiO? | 0.1188% |
Iron Oxide Fe?O? | 0.0223% |
Calcium Oxide CaO | 0.0210% |
MgO | 0.0060% |
K?O | 0.0010% |
Na?O | 0.0314% |
TiO? | 0.0018% |
P?O? | 0.0015% |
Cr?O? | 0.0002% |
ZnO | 0.0001% |
V?O? | 0.0001% |
Typical Physical Indicators of High-Purity Low-Sodium White Alumina Micropowder
Color | White |
|---|---|
Hardness | Mohs 9.0 |
Service Temperature | 1900 ℃ |
Melting Point | 2250 ℃ |
Specific Gravity | 3.95 g/cm3 |
Bulk Density | 3.9-3.95 g/cm3 |
Crystal Shape | Multi-angular |
Production Specifications:
JIS Particle Size | D0 (μm) | D3 (μm) | D50 (μm) | D94 (μm) |
|---|---|---|---|---|
#240 | ≤ 127 | ≤ 103 | 57.0±3.0 | ≥ 40 |
#280 | ≤ 112 | ≤ 87 | 48.0±3.0 | ≥ 33 |
#320 | ≤ 98 | ≤ 74 | 40.0±2.5 | ≥ 27 |
#360 | ≤ 86 | ≤ 66 | 35.0±2.0 | ≥ 23 |
#400 | ≤ 75 | ≤ 58 | 30.0±2.0 | ≥ 20 |
#500 | ≤ 63 | ≤ 50 | 25.0±2.0 | ≥ 16 |
#600 | ≤ 53 | ≤ 41 | 20.0±1.5 | ≥ 13 |
#700 | ≤ 45 | ≤ 37 | 17.0±1.5 | ≥ 11 |
#800 | ≤ 38 | ≤ 31 | 14.0±1.0 | <極>|
#1000 | ≤ 32 | ≤ 27 | 11.5±1.0 | ≥ 7.0 |
#1200 | ≤ 27 | <極> ≤ 23 | 9.5±0.8 | ≥ 5.5 |
#1500 | ≤ 23 | ≤ 20 | 8.0±0.6 | ≥ 4.5 |
#2000 | ≤ 19 | ≤ 17 | 6.7±0.6 | ≥ 4.0 |
#2500 | ≤ 16 | ≤ 14 | 5.5±0.5 | ≥ 3.0 |
#3000 | ≤ 13 | ≤ 11 | 4.0±0.5 | ≥ 2.0 |
#4000 | ≤ 11 | ≤ 8.0 | 3.0±0.4 | ≥ 1.8 |
Main Applications of High-Purity Low-Sodium White Alumina Micropowder:
High-temperature thermal spray materials.
High-quality ceramic grinding wheels.
Insulating powder for electronic ceramic sintering bedding.
Refractory materials such as linings and castables.
Raw material for high-end alumina ceramics like water filtration alumina ceramic membrane tubes.
Shell making and slurry addition in precision casting such as investment casting, replacing zircon sand to reduce casting costs.
| Industry Category: | Construction & Building Materials/Thermal Insulation Materials/Refractory Materials |
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