白剛玉
白剛玉是以優質鋁氧粉為原料,經電熔冶煉而成。它硬度略高於棕剛玉,韌性稍低、純度高、自銳性好、磨削能力強、發熱量小、效率高、耐酸堿腐蝕、耐高溫、熱穩定好。用其制成磨具,適於磨削高碳鋼、高速鋼等,還可作為研磨,拋光材料;精密鑄造、噴塗材料,化工觸媒載體,特種陶瓷、高級耐火材料等。
Chemical composition (%) | Item | Sand | Fines | Mirco powder |
Al2O3 | ≥99.2 | ≥99 | ≥98.5 |
SiO2 | ≤0.1 | ≤0.15 | ≤0.15 |
Fe2O3 | ≤0.08 | ≤0.1 | ≤0.1 |
Na2O | ≤0.35 | ≤0.4 | ≤0.6 |
Apparent porosity (%) | ≤8.0 | ≤8.0 | ≤8.0 |
Moh's hardness | 9 | 9 | 9 |
Hardness | HV2000-2200 | HV2000-2200 | HV2000-2200 |
True density(g/cm3) | ≥3.92 | ≥3.92 | ≥3.92 |
Refractoriness(℃) | ≥1850 | ≥1850 | ≥1850 |