Preparation of YSZ-TZP solid electrolytes by gel-casting technology

Area of Science:

• Materials Science
• Solid-State Chemistry
• Ceramic Engineering

Background:

• Yttria-stabilized zirconia (YSZ) is a key material for solid electrolytes.
• Tetragonal zirconia polycrystal (TZP) can enhance mechanical properties of ceramics.
• Combining YSZ and TZP may offer improved solid electrolyte performance.

Purpose of the Study:

• To prepare and characterize YSZ-TZP solid electrolytes using gel-casting.
• To investigate the effect of TZP content on densification, microstructure, and mechanical properties.
• To evaluate the impact of TZP on the electrical conductivity of YSZ-based solid electrolytes.

Main Methods:

• Gel-casting technology was employed for material preparation.
• Densification, microstructure, mechanical strength, fracture toughness, and electrical conductivity were measured.
• YSZ-TZP composites with varying TZP content (up to 8 mol% YSZ) were synthesized.

Main Results:

• Densification of YSZ-TZP solid electrolytes increased with higher TZP content.
• Maximum strength and fracture toughness were observed at 20 vol.% TZP.
• Ionic conductivity of the solid electrolyte decreased with increasing TZP addition.

Conclusions:

• Gel-casting is a viable method for producing YSZ-TZP solid electrolytes.
• Optimizing TZP content can enhance mechanical robustness.
• A trade-off exists between mechanical enhancement and ionic conductivity in YSZ-TZP systems.