White Fused Alumina is produced from high-quality alumina powder as the raw material through smelting at a high temperature of 2050 ℃. It features high purity, good self-sharpening ability, low heat generation during grinding, resistance to acids and alkalis, excellent high-temperature stability, and low porosity.
Applications
White Fused Alumina is the primary raw material for manufacturing medium- and high-grade monolithic and shaped refractory materials.
It is commonly used in monolithic refractory products such as ladle castables, iron trough mixes, and refractory gunning mixes.
In shaped refractories, it is mainly applied in corundum products, including corundum bricks, corundum-mullite saggers, porous corundum stopper bricks for refining, integrated lances, the three key components for continuous steel casting, and linings of ultra-high-temperature industrial kilns.
It is also a high-quality raw material for the abrasive and grinding tool industry, mainly used in grinding wheels, as well as polishing and grinding applications. It is widely utilized in the military industry, shipbuilding, glass, aviation, aerospace, optical instruments, nuclear energy, and other fields.
Advantages
Does not affect the color of processed workpieces.
Suitable for processes where iron powder residue is strictly prohibited.
The grain shape is ideal for wet sandblasting and polishing operations.
Technical Parameters
Used for refractory,castable
| Properties | 0-1 1-3 3-5 mm | F100 F200 F325 | |||
| Guarantee Value | Typical Value | Guarantee Value | Typical Value | ||
| Chemical Composition | Al2O3 | ≥99.1 | 99.5 | ≥98.5 | 99 |
|
SiO2 |
≤0.4 | 0.06 | ≤0.3 | 0.08 | |
| Fe2O3 | ≤0.2 | 0.04 | ≤0.2 | 0.1 | |
| Na2O | ≤0.4 | 0.3 | ≤0.4 | 0.35 | |
Used for abrasives,blasting,grinding
| Properties Type | Grains | ||
| 8# 10# 12# 14# 16# 20# 22# 24# 30# 36# 40# 46# 54# 60# 70# 80# 90# 100# 120# 150# 180# 220# | |||
| Guarantee Value | Typical Value | ||
| Chemical Composition | Al2O3 | ≥99.1 | 99.5 |
| SiO2 | ≤0.2 | 0.04 | |
| Fe2O3 | ≤0.2 | 0.03 | |
| Na2O | ≤0.3 | 0.2 | |
Used for abrasives ,lapping,Polishing
| Properties Type | Micropowder | ||
| "W" | W63 W50 W40 W28 W20 W14 W10 W7 W5 W305 W2.5 W1.5 W0.5 | ||
| "FEPA" | F230 F240 F280 F320 F360 F400 F500 F600 F800 F1000 F1200 F1500 F2000 | ||
| "JIS" | 240# 280# 320# 360# 400# 500# 600# 700# 800# 1000# 1200# 1500# 2000# 2500# 3000# 4000# 6000# 8000# 10000# 12500# | ||
| Guarantee Value | Typical Value | ||
| Chemical Composition | Al2O3 | ≥99.1 | 99.3 |
| SiO2 | ≤0.4 | 0.08 | |
| Fe2O3 | ≤0.2 | 0.03 | |
| Na2O | ≤0.4 | 0.25 | |
Production Process of White Fused Alumina
Tilting Furnace Process
This process is essentially an electric melting and tilting method. Industrial alumina powder is first melted into a liquid in an electric arc furnace at a temperature of ≥2000 °C, then slowly cooled and crystallized into a solid block inside the furnace. Finally, the block is discharged by tilting the furnace, and the finished product is obtained after crushing and sizing.
It is characterized by thorough cooling of the melt, high Al₂O₃ purity, and low levels of impurities.
Fixed Furnace Process
Also known as the fused block method or sintering method, this process involves pressing alumina powder into green bodies or directly loading it into the furnace. Densification is then achieved through solid-phase reactions or electrofused recrystallization at high temperatures, with the furnace remaining stationary throughout the process.
It is characterized by strong sintering bonds, sufficient crystal growth, and high overall strength.
Differences Between Tilting Furnace and Fixed Furnace White Fused Alumina
and Selection of Application Scenarios
Tilting Furnace
Moderate thermal expansion coefficient, average thermal shock resistance, suitable for applications with small temperature fluctuations.
Preferred: Tilting Furnace White Fused Alumina
Precision sandblasting: Surface treatment of stainless steel parts, aviation components, glass, etc., requiring strong cutting force and a high-quality surface finish.
Grinding & polishing: Precision cutting tools, wafer dicing, jewelry surface treatment, etc., requiring good self-sharpening and high efficiency.
Precision casting: Investment casting sand, requiring high purity and low gas evolution.
Fixed Furnace
Excellent thermal shock resistance, high-temperature resistance (≤1900 °C), and corrosion resistance, making it ideal for linings of high-temperature kilns.
Preferred: Fixed Furnace White Fused Alumina
Refractory materials: Ladle castables, corundum refractory bricks, glass furnace tank linings, etc., requiring high-temperature resistance, corrosion resistance, and dimensional stability.
Abrasive tools & grinding wheels: Cutting discs, grinding wheels, etc., requiring high toughness and good wear resistance.
High-temperature structural parts: Special ceramics, electronic ceramic substrates, etc., requiring high density and excellent thermal stability.
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