Special refractory brick series - silicon molybdenum brick
Size: AZM-1680 silica-mullite brick, AZM-1650 silica-mullite brick AZM-1550 silica-mullite brick (designed according to the lining of the rotary kiln).
Silica-mullite brick, a kind of refractory brick, has a homophone of 'wearresistant brick', and was successfully developed in the early 1990s. It was once called HMS high wear-resistant brick, and its wearresistant coefficient is more than five times higher than that of high alumina brick with phosphate bond. In terms of its phase composition, it should be a product of carbide-mullite, which is abbreviated as silica-mullite brick. This term is mostly popular in the building materials industry, and other usually call it high alumina silicon carbide brick, alumina trioxide-silicon carbide brick.
The production of carbonized silicon and high alum fireclay conforms to the development of refractory brick technology. Since silicon carbide oxidizes to produce silica, which reacts with alumina trioxide form mullite (3Al2O3˙2SiO2), it can improve the density and strength of the product, and form a protective film the surface of the product, which can prevent silicon carbide from further oxidation, so that silicon carbide can be kept at a certain content in high alumina carbide refractory brick, and improve the thermal shock stability, wear resistance and corrosion resistance of the product. The service life of high strength dense silica-ullite brick in the various zones of the cement rotary kiln is 3-4 times higher than that of high alumina brick.
In recent, the application of silicon-mullite refractory brick in cement rotary kiln has been rapidly developed, especially with the emergence and large-scale of new dry cement kiln, the rotation speed and thermal stress intensity in the kiln have been greatly improved, which puts forward new and higher requirements for the quality and physic properties of refractory materials. Therefore, in addition to the burning zone where the magnesia-chrome brick is still used under the protection of the kiln hung, the secondary burning zone, transition zone and cooling zone have been significantly better than the magnesia-chrome brick after the change of silicon-mullite.
Properties of silicon-mullite brick: (1) The product structure is dense and wear-resistant: the main crystal phase of silicon-mull refractory brick is composed of hard mineral silicon carbide and mullite, and the structure of finished silicon-mullite brick is dense with high bulk, which is generally 2.6-2.7 g/cm3. (2) High load softening temperature and good high temperature performance. (3 Silicon-mullite brick has good thermal shock stability. Since the silicon-mullite brick contains a certain amount of SiC, the thermal conductivity of Si is high, and the thermal expansion coefficient is relatively small, which significantly improves the thermal shock stability of silicon-mullite refractory brick. The water-ed test at 1100 ℃ is more than 10 times, so the silicon-mullite brick can achieve no peeling as the of the rotary kiln, and can improve the service life of the kiln.
Project | indicator | ||
AZM-1680 | AZM-1650 | AZM-1550 | |
Al2O3/% | ≥65 | ≥60 | ≥55 |
Refractoriness/℃ | 1800 | 1790 | 1750 |
Volume density g/cm³ | 2.65 | 2.6 | 2.55 |
Heating softening temperature 0.2MPa/℃ | ≥1650 | ≥1600 | ≥1550 |
Thermal shock stability1100℃水冷（次） | 15 | 12 | 10 |
Normal temperature pressure resistance strength/MPa | ≥90 | ≥85 | ≥80 |
Abrasion resistance（cm³） | 8 | 5 | 5 |
*Can be negotiated and customized according to the customer's indicators. | |||
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