4 mol % Yttria-stabilised Zirconia (4YSZ)

Our 4YSZ powder offers exceptional resistance to physical and chemical wear, producing a coating that is tolerant of the most extreme environments.
The highly dense, nanostructured powder also demonstrates a proven low thermal conductivity, making it the ideal material for the production of thermal barrier coatings (TBCs) via conventional air plasma spraying (APS) or suspension plasma spraying (SPS).
Independent testing has shown that after 10 hours  at 1300 °C, TBCs produced from Innovnano’s 4YSZ show a ~30% (SPS) and ~20% (APS) reduction in thermal conductivity when compared to the Benchmark. This significant reduction translates to increased efficiency and durability, as well as a decrease in emissions and costs.

Comparison of thermal conductivity

4YSZ in suspension

Available as a submicron powder dispersed in ethanol or as an aqueous suspension.
Our 4YSZ powder exhibits excellent dispersion properties, particularly in the ethanol suspension, where no dispersants or other additives are required - resulting in simpler chemistry.
Extensive independent testing of the 25% (weight) 4YSZ in suspension demonstrates its suitability for SPS applications. TBCs that exhibit a good morphology with strain relief structure show significantly lower thermal conductivity properties and good erosion and thermal cycling resistance.

Spray-dried 4YSZ granules

Available as 60 µm (D50) spray-dried free flowing granules either with or without polymeric additives.
APS applications are well established and typically use larger 4YSZ granules entrained into the plasma stream of conventional spray gun torches.
We can spray dry our 4YSZ powder to produce spherical micro-granules for easy handling and compatibility with your existing technology or manufacturing equipment. What differentiates us, is the lower thermal conductivity TBCs that our powders have been shown to produce.


4YSZ from Innovnano is ideally suited to the production of thermal barrier coatings (TBCs) for some of the most advanced and demanding industries:

  • Aerospace
  • Automotive
  • Energy

TBCs provide an essential protective and insulating layer for engineering products and components that operate in extreme environments. They are widely used in turbine engines, acting to:
  • Protect against wear and micro-cracking
  • Prevent oxidation and corrosion
  • Minimise thermal degradation
  • Provide thermal insulation
  • Extend service intervals
  • Improve fuel efficiency by allowing higher burn temperatures

The development and physical application of TBCs is largely driven by technological, economic and societal pressures to increase turbine efficiency by operating them at increasingly higher temperatures. This improves the efficiency of fuel combustion and therefore reduces cost and contributes to a more environmentally-friendly life cycle of turbine engines.
Our highly dense, nanostructured 4YSZ ceramic powder has very low thermal conductivity at high temperatures, making it the ideal material for TBC ceramic topcoats.

If you have an application in mind, please get in touch.