Features of 8% Yttria Stabilized Powder for spraying
8% Yttria Stabilized Zirconia Spraying Powder (8YSZ) is a premium thermal spray ceramic powder known for its high‑temperature stability, low thermal conductivity, and excellent coating performance. It is widely used in aerospace, power generation, and industrial thermal barrier coating (TBC) applications.
Below are its key features in clear technical aspects:
• High Thermal Stability
8% yttria provides full stabilization of zirconia into the cubic crystal structure, eliminating phase transitions and associated volume changes. This results in superior resistance to thermal shock and long-term durability under extreme temperature cycling.
• Lowest Thermal Conductivity Among YSZ Grades
8YSZ has a lower thermal conductivity compared to 3YSZ and 5YSZ, making it the preferred choice for high‑temperature insulation in advanced TBC systems.
• Excellent High‑Temperature Phase Stability
The cubic phase remains stable even at temperatures exceeding 1400°C, ensuring minimal sintering and coating degradation over time.
• Good Coating Density and Bond Strength
When plasma sprayed, 8YSZ forms dense, well‑adhered coatings with low porosity, providing effective protection against heat and corrosion.
• Superior Resistance to Sintering and CMAS Attack
8YSZ coatings show better resistance to calcium‑magnesium‑alumino‑silicate (CMAS) deposits and sintering at high temperatures compared to lower yttria grades, making them suitable for demanding aerospace engine environments.
• Spherical Powder Morphology
Typically produced as spherical particles with high flowability, ensuring consistent feeding, high deposition efficiency, and uniform coating microstructure.
• Controlled Particle Size Distribution
Optimized particle sizes (e.g., 20–63 μm for plasma spraying) ensure stable plasma formation and reproducible coating thickness and quality.
• Chemical Inertness
8YSZ is chemically stable and resistant to oxidation, corrosion, and reaction with most metals and environmental gases at high temperatures.
• Versatile Application Range
Suitable for TBCs on turbine blades, combustors, exhaust components, and industrial furnace parts, as well as for wear‑resistant and dielectric coatings.
