Synthetic mullite

      Synthetic mullite (synthetic dense aluminosilicate aggregate) grades M45, M47, and M60 are produced from high-quality hard clay (kaolin content ≥95%) through a specialized high-temperature calcination process. Compared with standard hard clay clinker, these products offer superior physical and chemical properties, including a stable chemical composition, high mullite content, high bulk density, low apparent porosity, excellent high-temperature volume stability, high load softening temperature, resistance to rapid heating and cooling, and strong resistance to high-temperature erosion.
      They are widely used in metallurgy, glass, building materials, ceramics, and other industries, and can be processed into various particle sizes to meet specific application requirements.

      Mullite can be synthesized using various methods, with solid-state reaction sintering and electrofusion being the most common. In solid-state reaction sintering, mullite is formed by heating raw materials to high temperatures to promote a solid-state reaction. In electrofusion, raw materials are melted in an electric arc furnace and then cooled to crystallize mullite.
      The raw materials used for mullite synthesis are generally divided into natural and industrial sources, such as high-alumina bauxite and industrial alumina. Synthesis temperature and holding time are key factors affecting mullite's properties, with typical processing carried out at 1650–1700℃.
      Synthetic mullite finds application as a refractory material in glass melting furnaces, metal smelting, and as a raw material for high-alumina bricks or as an aggregate in monolithic refractories.

Main physicochemical properties of synthetic mullite products

High-temperature mechanical properties
Maintains excellent mechanical strength at elevated temperatures and resists deformation or structural damage.
High-temperature creep resistance
Under high-temperature conditions, mullite materials can resist plastic deformation and maintain the stability of the material's shape.
Thermal shock resistance
It has good thermal shock stability and can maintain stable performance in environments with rapid temperature changes.
Chemical stability
It has a high resistance to the erosion of chemical substances and can remain stable in various chemical environments.

      Synthetic mullite also features high purity and good homogeneity and can be produced via various methods, including electrofusion and sintering. Mullite obtained by electrofusion typically forms well-developed needle-like or columnar grains with pronounced cleavage, making it relatively brittle. In contrast, sintered mullite has finer, granular grains and is less prone to breakage. Both synthesis methods offer distinct advantages, and the choice depends on the application requirements and operating environment.

Our Advantages

 

      Mullite is widely used in industries such as refractory materials, ceramics, metallurgy, casting, and electronics due to its excellent properties. Its high-temperature stability makes it particularly suitable for applications involving direct flame contact, such as petroleum cracking furnaces and metallurgical hot blast furnaces, where it also provides significant energy-saving benefits.

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