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Sillimanite Brick – High Temperature & Creep Resistant Refractory Brick
1. Product Introduction
Sillimanite brick is a high-grade aluminum silicate refractory brick manufactured with high-purity sillimanite ore as the main raw material, through precise batching, high-pressure molding and ultra-high temperature sintering. Sillimanite belongs to natural crystalline mineral with stable lattice structure, low thermal expansion rate and excellent high-temperature mechanical performance. Different from ordinary high alumina bricks and clay bricks, sillimanite bricks feature extremely low creep deformation under long-term ultra-high temperature load, stable volume change and outstanding thermal shock resistance.
Due to its superior high-temperature stability, sillimanite refractory brick is widely recognized as a premium lining material for continuous high-temperature industrial kilns, especially suitable for long-cycle production environments that require no deformation, no cracking and no spalling at 1500℃–1650℃.
2. Core Performance Advantages
2.1 Ultra-Low Thermal Expansion & Volume Stability
Sillimanite mineral has an extremely stable crystal structure with minimal thermal expansion coefficient under high temperature. The brick will not produce excessive volume expansion or shrinkage during repeated heating and cooling processes. It effectively avoids furnace lining cracking, brick extrusion and structural damage caused by volume change, ensuring the overall tightness and stability of the kiln lining for long-term operation.
2.2 Excellent High-Temperature Creep Resistance
This is the most prominent advantage of sillimanite brick. Under long-term high-temperature load and continuous high-temperature operating conditions, the brick maintains extremely low creep deformation. It will not bend, sink or deform even after years of high-temperature service, which perfectly solves the problem of lining collapse and structural failure caused by high-temperature creep of ordinary refractory bricks.
2.3 Superior Thermal Shock Resistance
With uniform internal structure and moderate thermal conductivity, sillimanite brick can adapt to frequent temperature fluctuations and intermittent furnace operation. It resists thermal stress damage effectively, rarely peeling or cracking under rapid temperature rise and drop, greatly improving the safety and service life of furnace lining.
2.4 High Refractoriness & Structural Strength
High-purity sillimanite raw materials endow the brick with high refractoriness above 1780℃. It maintains high mechanical strength at ultra-high temperature, without softening or strength attenuation. The compact sintered structure provides strong resistance against high-temperature flue gas scouring and material abrasion.
2.5 Good Chemical Stability
Sillimanite brick has strong resistance against weak acid and neutral slag erosion, stable chemical inertia in high-temperature firing environment, and is not easy to react with kiln atmosphere, ash and flue gas. It can resist slight alkali erosion in conventional industrial kilns and keep stable performance for a long time.
3. Main Technical Parameters
Al₂O₃ Content: ≥58%–62%
Refractoriness: ≥1780℃
Long-term Service Temperature: 1500℃–1650℃
Bulk Density: ≥2.55 g/cm³
Cold Crushing Strength: ≥60 MPa
Linear Thermal Expansion Rate: ≤0.6% (1200℃)
High Temperature Creep Performance: Extremely low deformation under sustained high-temperature load
Standard Specification: 230×114×65mm, custom special-shaped sizes available
4. Industrial Application Scope
1. Widely used in high-temperature tunnel kilns, roller kilns and shuttle kilns, especially for kiln car surface lining, kiln wall middle and high temperature sections, arch parts and long-term continuous firing zones. It solves the problem of kiln body deformation and brick cracking during long-cycle production.
2. Suitable for steel heating furnaces, soaking furnaces, furnace roof, furnace wall and high-temperature load-bearing parts. Its excellent creep resistance ensures no structural deformation of the furnace body under long-term high-temperature operation.
3.Applied in high-temperature rotary kilns, industrial calcining furnaces and chemical reaction furnaces. It is the ideal lining material for equipment requiring stable size and long service life at ultra-high temperature.
4.Ideal for all kinds of high-temperature industrial furnaces with strict requirements on deformation, thermal shock and structural stability, greatly reducing furnace maintenance frequency and improving production efficiency.
5.Ordinary high alumina bricks have obvious high-temperature creep and large thermal expansion rate, which are prone to deformation and cracking after long-term high-temperature operation. In contrast, sillimanite bricks adopt natural sillimanite crystalline raw materials, with far lower thermal expansion and negligible high-temperature creep deformation. In long-cycle continuous production kilns, the service life of sillimanite brick is 2–3 times that of ordinary high alumina brick, with more stable overall kiln structure.
6. Construction & Usage Guidelines
Before masonry, clean the furnace wall base to ensure flat and dry construction surface. Match with high-quality refractory mortar for laying, keep uniform brick joints and ensure tight bonding. Avoid forced extrusion and violent impact during construction. After masonry completion, adopt staged slow heating baking system to discharge internal moisture stably, prevent sudden temperature rise from causing brick body cracking. Reasonable construction and baking can maximize the service performance of sillimanite bricks.
7. Packaging & Storage
Sillimanite refractory bricks are packed with waterproof film and fixed by standard wooden pallets to prevent collision and moisture during transportation. Store products in dry, ventilated and rain-proof warehouse. Avoid heavy stacking and long-term damp environment to prevent performance change. Proper storage can fully guarantee the physical and chemical stability of the bricks before use.
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