白剛玉 (WFA) 是一種高純度的合成材料，由高品位氧化鋁在電弧爐中熔結而成。純度超過 99% 的氧化鋁 (Al₂O₃)，具有極佳的硬度、高熱穩定性和耐化學腐蝕性。均勻的粒度分佈和角狀結構使其成為精密研磨應用的理想材料。此外，其不含鐵和低鈉的成份可確保將污染減至最低，在高需求的環境中提供優異的性能。
1.高純度氧化鋁在電弧爐中以超過 2000°C 的溫度熔化。
2.將熔融材料冷卻結晶，然後壓碎成細粉末。
3.採用先進的篩選和磁性分離技術，以去除雜質並達到所需的晶粒尺寸。
4.最終產品經過嚴格的品質測試，以確保一致性並符合業界標準。
由於白剛玉具有高熔點和優異的熱導性，因此被廣泛用於製造先進的耐火材料。主要應用包括
- 澆注料和單晶：增強高溫襯片的強度和抗熱衝擊能力。
- 耐火磚：在熔爐、窯和反應器中提供耐久性和穩定性。
- 滑動閘門和噴嘴：在煉鋼製程中提供耐磨性與長效性。
其純度和熱穩定性使其在要求極端條件下性能穩定的環境中不可或缺。
| Chemical Component | Content (%) | 備註 |
| Al₂O₃ | 99.5 – 99.9 | High purity |
| Na₂O | 0.1 – 0.3 | Controlled impurity |
| Fe₂O₃ | 0.02 – 0.05 | Low iron content |
| SiO₂ | 0.02 – 0.04 | Minimal silica |
| CaO | 0.02 – 0.05 | Trace calcium |
This report provides an analysis of White Fused Alumina (WFA) for refractory applications. White Fused Alumina is a high-purity synthetic material produced by fusing calcined alumina in electric arc furnaces. It is widely used in the refractory industry due to its exceptional chemical purity, high melting point, and superior thermal resistance.
The following tests were conducted according to international standards such as ISO 12677:2022 and ASTM C704-15:
– Chemical Composition Analysis
– Bulk Density and Apparent Porosity Testing
– Thermal Shock Resistance
– Grain Size Distribution Analysis
The chemical composition of the tested sample is as follows:
| Component | Content (%) |
| Al₂O₃ | 99.6 |
| Na₂O | 0.18 |
| SiO₂ | 0.05 |
| Fe₂O₃ | 0.03 |
The physical properties of White Fused Alumina are as follows:
| Property | Value |
| Bulk Density (g/cm³) | 3.95 |
| Apparent Porosity (%) | 3.0 |
| Thermal Shock Resistance (Cycles at 1000°C) | 30 |
The grain size distribution was analyzed, and the results are summarized below:
| Grain Size (µm) | Percentage Passing (%) | Standard Deviation |
| < 53 | 99.0 | ±0.3 |
| 53-150 | 85.0 | ±1.0 |
| > 150 | 12.0 | ±0.8 |
The tested White Fused Alumina shows exceptional properties ideal for refractory applications. Its high alumina content, minimal impurities, and robust physical properties ensure reliable performance in demanding high-temperature environments.
