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We all know that high alumina castable is a type of refractory castable with relatively high alumina content. It is widely used in the construction of high-temperature kilns. It has excellent refractory properties, high-temperature resistance, corrosion resistance, and oxidation resistance. Therefore, its range and frequency of use are extremely high. However, many people know about high alumina castable but do not understand it well or know how to choose it? Today, we will introduce you to the "star product" of kilns — high alumina castable!
High alumina castable is composed mainly of high-alumina clinker, dolomite, and soda lime. After mixing and adding water, it hardens to form an inorganic non-metallic material. It has excellent high-temperature resistance, wear resistance, and corrosion resistance, making it widely used in metallurgy, building materials, chemical, and other industries.
High alumina castable typically operates within a temperature range of 1400℃ to 1600℃, showing very good high-temperature performance. Its primary refractory material, high-alumina clinker, is made from kaolin or mullite at high temperatures, resulting in refractory materials containing high aluminum oxide. The melting point of high-alumina clinker is relatively high, usually between 1850-1900℃, which gives it good refractory properties.
High-alumina refractory castable is supplied as loose dry powder, typically in 25kg/and 50kg/ bags, with additional ton bag packaging options.
On the basis of traditional ratios, we've meticulously optimized high-alumina refractory castable. By carefully adjusting the particle grading and ingeniously adding various additives, we have successfully reduced the amount of cement used, significantly enhancing the performance of the material. Notably, these improvements have not only increased the medium-temperature strength of the material but also raised its load-softening temperature, meaning the material can remain stable and durable for a longer period in high-temperature environments.
In addition, high alumina castable shows excellent thermal stability and reduced thermal conductivity, which is significant in practical applications. This material also exhibits outstanding resistance to penetration, erosion, impact, and abrasion, with superior mechanical properties, which enhances the overall integrity of the furnace structure. Compared to traditional brick-built furnaces, furnaces constructed with high alumina castable have better airtightness, effectively extending furnace life and significantly reducing furnace repair costs, thus bringing significant economic benefits to enterprises. These characteristics collectively demonstrate the superior performance and broad application prospects of high alumina castable in the field of refractory materials.
High-temperature performance
This material can withstand extreme temperatures exceeding 1500℃. During this process, it can still maintain stable physical and chemical properties, which is undoubtedly an indispensable quality in high-temperature industrial environments.
Wear resistance
When facing mechanical impact and abrasion at high temperatures, refractory high alumina castable shows strong resistance, which not only effectively extends the equipment's service life but also provides robust support for the stable operation of the equipment.
Chemical corrosion resistance
Whether faced with acidic or basic chemicals, high-alumina refractory castable shows a good resistance ability that effectively counters various chemical and corrosive attacks, ensuring long-term stable operation of the equipment under harsh environments.
Thermal shock stability
Even when undergoing repeated thermal shock cycles at high temperatures, it can maintain structural integrity, making it less prone to cracking or spalling.
Constructability
Whether for casting, spraying, or coating, high-alumina refractory castable can easily cope, making it adaptable to various shapes and sizes of equipment linings and bringing great convenience to construction.
Lastly, its high strength and durability are also significant advantages. High alumina castable not only possesses high strength but can also work stably for prolonged periods in high-temperature environments, providing strong support for the high-temperature industrial field.
