Non-Stick Aluminum Castable
Non-Stick Aluminum Castable Description
Non-stick aluminum castable is mainly used in aluminum smelting furnace, aluminum press casting heat preserving furnace and so on. Although the melting point of aluminum is not high, only about 660℃, aluminum liquid has low viscosity, high permeation ability and high activation property, which makes it have drastic corrosion to refractory furnace lining.
The Damage Mechanism Of Refractory Lining
- Aluminum liquid can react with SiO2 in Al2O3-SiO2 series refractory material and produce Al2O3+Si. So the structure of Al2O3-SiO2 refractory will be destroyed, meanwhile, impurity Si will also contaminate aluminum liquid.
- Aluminum liquid can infiltrate into refractory material pores, increases the contacting area of refractory material and change the composition. When the infiltration reaches to a certain depth, accompanied with the reaction of aluminum and SiO2, refractory material will have structural spalling.
Non Stick Aluminum Castable Property
To solve this problem, refractory material contacting with aluminum liquid should adopt non-stick aluminum castable. Non-stick aluminum castable has high density(low porosity), good high temperature, middle temperature and room temperature strength, and the strength is positively correlated to temperature. Meanwhile, non-stick aluminum furnace castable has good volume stability at different temperature. With the addition of ultra micro powder component, the porosity of non-stick aluminum processing castable is lower than 10%, the average pore aperture is only 0.5μm. So aluminum liquid can’t permeate into non-stick aluminum castable lining. What’s more, composite additives added in castable can increase aluminum liquid’s contact angle with castable lining and significantly strengthen lining’s aluminum liquid permeation resistance.
Non-Stick Aluminum Castable Physiochemical Index
| Item | BZL-1 | BZL -1A | BZL-M | BZL-F | BZL-G | |
| Chemical composition | Al2O3≥ | 60 | 65 | 65 | 70 | 80 |
| Fe2O3≤ | 0.6 | 0.5 | 0.4 | 0.4 | 0.3 | |
| BaO+ZnO+B2O3≥ | 3 | 3 | 3 | 4 | 4 | |
| Bulk density g/cm3≥ | 2.4 | 2.5 | 2.65 | 2.7 | 2.8 | |
| Compression strength Mpa≥ | 110℃*24h | 35 | 40 | 40 | 45 | 45 |
| 1300℃*16h | 40 | 45 | 45 | 50 | 50 | |
| Rupture strength Mpa≥ | 110℃*24h | 5 | 10 | 10 | 12 | 14 |
| 1300℃*16h | 10 | 13 | 13 | 15 | 16 | |
| Linear change rate % (1300℃*3h) | 0～+0.2 | 0～+0.2 | 0～+0.2 | 0～+0.1 | 0～+0.1 | |
Non-Stick Aluminum Castable Application
Non-stick aluminum castable is specially developed for aluminum processing industry, it is mainly used in aluminum melting furnace wall, furnace bottom, degassing tank, launder and fore-tank. No stick aluminum castable is also used for the furnace lining of keeping furnace, aluminum liquid heat preserving furnace, aluminum ladle and so on. Especially suitable for the integral casting of heat preserving furnace and lining of high purity aluminum smelting equipment. Non-stick aluminum castable synthesizes the characteristics of organic binders and inorganic binders, added in certain quantity of new type composite material, can effectively avoid the infiltration of aluminum liquid and significantly prolong the service life of refractory castable lining.