Porous Ceramics

The range of Refractron porous ceramics are made from aluminum oxide and silicon carbide. The strong, uniform porous ceramic has 40-50% open porosity with a tortuous pore structure and is available in pore sizes ranging from 0.25 to 90 microns. Monolithic, single grade, aluminum oxide porous ceramic is available in 6, 15, 30, 50, 60 and 90 micron pore sizes. In addition, Refractron produces a ceramic membrane that uses a medium pore substrate with a thin coating of fine porous ceramic membrane in 0.25, 1, 3 and 6 micron pore sizes.

Aluminum oxide is the most standard material, with a density of 2.2 g/cc, and has a maximum operating temperature of 1400 F (800 C).  Silicon Carbide is more of a special order material, with a density of 1.9 g/cc, for more aggressive applications and has a maximum operating temperature of 1800 F (1000 C) and has excellent thermal shock resistance. Flexural strength (M.O.R.) for both is in the range of 1500 to 4000 psi. Thermal expansion (C.T.E.) is in the range of 4 to 7 x E6/ degree C. These standard porous ceramic materials are naturally hydrophilic. For special applications they maybe coated or impregnated to achieve a certain performance characteristic.

The range of porous ceramic products includes membrane and monolithic tubes, discs, plates and other components made from aluminum oxide and silicon carbide where tightly controlled pore size and porosity is critical. Filtration is a common application where porous ceramic is used for catalyst recovery, hot gas, liquid backwash, solvent filtration, and coalescing solids recovery in chemical process, water and mining industries. Diffusion or sparging using porous ceramics to produce fine bubbles is a common application as high gas transfer efficiencies are be achieved with the uniform pore structure.

  • Alumina

    Alumina

    Alumina (aluminum oxide) is used in a variety of applications up to 800°C to replace metal, plastic, polymer or fabric. Alumina demonstrates excellent resistance to organic solvents and alkaline solutions up to ~50ºC (122°F).

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  • Mullite

    Mullite

    Mullite is a silicate mineral of post-clay produced during various melting and firing processes. The chemical composition is critical and influences the mechanical strength and thermal shock resistance. Mullite also has superior corrosion resistance to most chemicals.

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  • Silicon Carbide

    Silicon Carbide

    Silicon Carbide (SiC) porous ceramics with a hybrid reaction bond can withstand higher temperatures than traditional glass-bonded porous ceramics. Silicon carbide offers chemical durability, thermal shock and creep resistance for applications up to 1200ºC (2192ºF).

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