Description

Key Properties & Advantages
This 8YSZ electrolyte slurry balances processability with high-temperature ionic conductivity, tailored for tape casting and thin coatings:

Controlled Solids Content (45–55%): Enables the formation of thin, flexible green tapes via tape casting, with minimal shrinkage during sintering. This ensures dense, gas-impermeable layers that prevent fuel-oxidant crossover while reducing electrolyte thickness (and thus ionic resistance) in SOFCs.
Fine Fineness (<5 μm): Ensures uniform dispersion of 8YSZ particles, eliminating agglomerates that could create pores or weak points in the sintered layer. The sub-5 μm size promotes densification at 1200–1400°C, forming a fully cubic zirconia structure with no phase transitions (critical for avoiding cracking under thermal cycling). Low Viscosity (250–400 cP): Optimized for tape casting and spray coating, ensuring smooth flow during casting to form defect-free thin films. The viscosity prevents particle settling, maintaining uniform particle distribution across large-area tapes—essential for consistent conductivity in SOFC stacks. High Oxygen Ion Conductivity: 8YSZ exhibits exceptional ionic conductivity (10⁻²–10⁻¹ S/cm at 800–1000°C), enabling efficient oxygen ion transport from cathode to anode. Its cubic phase stability eliminates the monoclinic-tetragonal phase transitions that cause failure in pure zirconia. Thermal & Chemical Compatibility: Matches the thermal expansion coefficients of SOFC components (e.g., LSM cathodes, NiO-YSZ anodes), reducing interfacial stress. Resists corrosion in oxidizing and reducing atmospheres, ensuring long-term stability in SOFC operating environments. Tape Casting Versatility: Forms flexible green tapes that can be easily cut, laminated, or coated onto anode/cathode substrates, supporting scalable production of planar or tubular SOFC designs. Core Applications Solid Oxide Fuel Cells (SOFCs) This 8YSZ slurry is the industry standard for high-temperature SOFC electrolytes, enabling efficient energy conversion: Tape-Cast Electrolyte Layers: Used to fabricate thin (10–50 μm) dense electrolytes via tape casting, which are then laminated to anode or cathode supports—reducing ionic resistance and improving SOFC power density. Thin-Film Coatings: Applied via spray coating or dip coating onto anode supports (e.g., NiO-3YSZ), forming conformal electrolyte layers that adhere tightly to the substrate, ensuring mechanical robustness during thermal cycling. SOFC Stacks: Enables mass production of uniform electrolyte layers for multi-cell stacks, leveraging its batch consistency to ensure balanced performance across all cells. Other High-Temperature Devices Oxygen Sensors: Used as a solid electrolyte in zirconia-based oxygen sensors for industrial furnaces and automotive exhaust systems, leveraging its oxygen ion conductivity and stability at high temperatures. Thermal Barrier Coatings (TBCs): Applied as a thin, dense layer in advanced TBC systems, where its low thermal conductivity and phase stability protect metal components from extreme heat. Technical Specifications The active component is high-purity 8YSZ ((Y₂O₃)₀.₀₈(ZrO₂)₀.₉₂) with a solids content of 45–55 wt.% (8YSZ + binder/plasticizer system). The fineness (maximum particle size, laser diffraction method) is <5 μm, and the viscosity is 250–400 cP (measured at 25°C using the Brookfield method). The binder system consists of an organic binder + plasticizer (burns out cleanly at 400–600°C), the sintering temperature is 1200–1400°C in air (2-hour ramp + 2-hour hold), and the color is a white to off-white slurry. Application Guidelines Tape Casting: Mix with plasticizers (if needed) to adjust flexibility, then cast onto Mylar sheets using a doctor blade (gap: 50–200 μm). Dry at 60–80°C to form green tapes. Thin-Film Coating: Compatible with spray coating or dip coating onto pre-sintered anode supports. Adjust viscosity with solvent (e.g., ethanol) for specific equipment. Sintering: Fire green tapes or coatings at 1200–1400°C in air to achieve >98% density, ensuring gas tightness. Slow ramp rates (50–100°C/hour) prevent cracking.