Recrystallized Silicon Carbide RSiC Flat-Sheet Ceramic Membrane

This high-precision filtration membrane is manufactured from high-purity silicon carbide fine powders through a recrystallization sintering process. It features high flux, excellent corrosion resistance, easy cleaning, and long service life.

The recrystallization process involves mixing coarse high-purity SiC powder with highly reactive SiC micropowder, followed by vacuum sintering at elevated temperatures to induce recrystallization. This yields a high-purity silicon carbide material with no intermediate bonding phase, providing outstanding high-temperature mechanical properties, chemical stability, and thermal shock resistance.

With a SiC content of ≥99% and no intergranular bonding phase, the material exhibits exceptional chemical stability. It withstands extreme pH environments (pH 1–14) and is resistant to all organic solvents, making it reliably operable in strong acids, strong alkalis, and a wide range of corrosive media over prolonged periods.

Compared with conventional polymer membranes and oxide-based ceramic membranes, the recrystallized silicon carbide material demonstrates remarkable behavior at elevated temperatures:

• Strength increases with temperature – the modulus of rupture rises from 90–100 MPa at 20°C to 100–110 MPa at 1200°C, a rare characteristic among ceramic materials
• Excellent thermal conductivity – reaching 35–36 W/(m·K) at 1200°C, which facilitates efficient heat transfer and dissipation in high-temperature processes
• Outstanding thermal shock resistance – capable of withstanding rapid temperature fluctuations without cracking, making it ideal for processes with frequent start-up/shutdown or variable thermal conditions
• Maximum working temperature of 1650°C (in oxidising atmospheres), far exceeding the limits of ordinary ceramic and organic membranes

The membrane offers high hardness (1800–2000 kg/mm²), good fracture toughness (1.8–2.0 MPa·m¹/²), and a crushing strength of 300 MPa. These robust mechanical attributes ensure structural integrity and long-term durability under high-pressure, high-flow, and particulate-laden conditions.

The recrystallized silicon carbide material possesses inherent hydrophilicity and a highly porous, interconnected pore structure, enabling high permeate flux. The high flux translates to a smaller equipment footprint and lower energy consumption per unit of treated volume. Moreover, the membrane surface resists fouling, allowing more efficient backwashing and clean-in-place procedures, thus simplifying maintenance and reducing downtime.

Leveraging the above performance advantages, this recrystallized silicon carbide plate ceramic membrane is widely applicable in:

• Environmental & Water Treatment – municipal wastewater treatment, industrial wastewater treatment and reuse, seawater desalination pretreatment, and oily emulsion wastewater treatment
• Chemical & Petrochemical Industries – oil-water separation in petroleum refining and coal chemical processes, coal-slurry water treatment, and filtration of acidic/alkaline media
• Food & Beverage – clarification and filtration of fruit juices, wines, and beverages; as well as degerming and concentration of dairy products
• Biopharmaceutical – fermentation broth clarification, antibiotic purification, and extraction/purification of active ingredients from traditional Chinese medicines
• New Energy & Advanced Materials – ultra-fine separation of nanomaterials, lithium-battery materials, graphene, and other advanced particulates

This recrystallized silicon carbide plate ceramic membrane, with its ≥99% purity, 1650°C temperature tolerance, superior high-temperature mechanical performance, and excellent chemical stability and thermal shock resistance, offers distinct technological benefits in advanced filtration and separation applications. Whether facing extreme conditions such as high temperature or strong corrosion, or pursuing high-flux, long-life operation, this product provides a reliable and cost-effective solution for diverse industrial needs.