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1.Product introduction of bubble alumina brick
Bubble alumina brick is a new type of high temperature insulation material. It is formed by melting and blowing industrial alumina in an electric furnace. With aluminum oxide bubble as the main part, products of various shapes can be made, and the maximum working temperature is 1800 ℃. The mechanical strength of these products is very high, which is several times of that of ordinary light products, while the bulk density is only half of that of corundum products.
2.Features of bubble alumina brick
- Good thermal stability
- Small change rate of reburning line, durable
- Strong thermal insulation and low thermal conductivity
3.Parameters of bubble alumina brick
| Index | Level I | Level II | Level III |
| Al2O3, % | ≥98 | ≥98 | ≥98 |
| SiO2, % | ≤1 | ≤1 | ≤1 |
| Fe2O3, % | ≤0.7 | ≤0.7 | ≤0.7 |
| Refractoriness under load, ℃ | ≥1790 | ≥1790 | ≥1790 |
| Refractorines under load, 0.1MPa, ℃ | ≥1600 | ≥1600 | ≥1600 |
| Bulk density, g/cm3, ≤ | 1.2 | 1.4 | 1.6 |
| True porosity, %, ≥ | 62 | 60 | 58 |
| Cold crushing strength, MPa, ≥ | 3 | 10 | 12 |
| Thermal Conductvity, 1100℃, W.(m.k), ≤ | 0.93 | 1.04 | 1.16 |
4.Application of bubble alumina brick
Alumina hollow ball bricks can be used in high-temperature energy-saving inverted flame kiln, shuttle kiln, molybdenum wire furnace, tungsten rod furnace, induction furnace, nitriding furnace, etc.