Coimbra, 8 December 2016 – An independent study has shown that Yttria Stabilised Zirconia (YSZ) from Innovnano, an expert manufacturer of structural zirconia ceramics, produces Thermal Barrier Coatings (TBCs) with proven low thermal conductivity. The Thermal Spray Team of the National Research Council of Canada (NRC) observed a 30% reduction in thermal conductivity when compared to a benchmark TBC, which translates to an increase in turbine engine efficiency, reduced emissions, improved durability, and lower costs.
In the study, 4 mol % YSZ (4YSZ) from Innovnano was used to manufacture TBCs through both air plasma spraying (APS) and suspension plasma spraying (SPS). Innovnano 4YSZ TBCs applied by SPS demonstrate a 30% reduction in thermal conductivity at 1300 °C, compared to the APS benchmark. This translates into an approximately 100 °C increase in temperature difference across a 200 micron thick coating, which means that equivalent surface temperatures can be achieved using 30% less coating thickness compared to the benchmark. As a result, parts coated with TBCs produced with Innovnano’s 4YSZ powder are more efficient, so can be lighter and therefore much more cost-effective in operation.
Rosa Calinas, Technical Manager at Innovnano, commented: “Across many industries, including aerospace and energy generation, minimising the weight of components and parts is critical. Less weight means increased efficiency and, especially when combined with improved durability, reduced replacement costs. The NRC’s independent study further validates our findings, demonstrating the low thermal conductivity of our 4YSZ coatings. 4YSZ is just one of the structural zirconia ceramic powders in our range, which all benefit from improved properties and features that are passed on to the end-product.”
4YSZ is synthesised by Innovnano using its proprietary manufacturing technology – Emulsion Detonation Synthesis (EDS). EDS transforms precursor chemicals into powders through a micro-second exposure to high temperatures and pressures. During the process, temperatures can exceed 3000 K and pressures are greater than 10 GPa. The result is a nanostructured powder with guaranteed small grain sizes and high chemical homogeneity.
Through EDS, Innovnano produces a range of nanostructured zirconia ceramic powders that can be tailored for unique structures and properties. With their optimised characteristics, Innovnano’s range of powders enhance the physical, chemical and mechanical properties of ceramics to improve the functionality, behaviour, durability and value of the end-product.