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Evaluation Reveals Coating can Extend Blade Life

Friday, March 15, 2019

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Testing has recently revealed that Hardide Coatings’ (Oxfordshire, England) nanostructured chemical vapor deposition coating, which provides resistance to water droplet erosion and solid particle erosion, extends the life of steam turbine blades. Results were announced in an emailed press release.

National Physical Laboratory and the University of Manchester were responsible for testing. The evaluation process examined how effective the coating was at providing protection from WDE and preventing cracking in FV520B last stage turbine blades. Hardide manufactures advanced tungsten carbide coatings for a range of engineering components.

Coating Evaluation

After being exposed to WDE for 90 hours, Hardide-A coated 410 stainless steel samples displayed nearly no damage in the central zone. The uncoated samples of the same type of stainless steel suffered damage—namely a 200-micron-deep scar across the face of the sample, having only been exposed for seven hours.

Hardide Coatings

Testing has recently revealed that Hardide Coatings’ (Oxfordshire, England) nanostructured chemical vapor deposition coating, which provides resistance to water droplet erosion and solid particle erosion, extends the life of steam turbine blades. Results were announced in an emailed press release.

Tests commissioned by Hardide’s customer EDF Energy at the University of Manchester also took a look at the static behavior solid particle erosion resistance of the coating on FV520B steam turbine blade material. Results indicated, after 30 hours of static testing, there was 0.18 percent weight loss for uncoated material compared to 0.04 percent weight loss for coated blades.

“Water droplet erosion and fatigue are industry-wide pressing issues and we are very pleased with these initial test results which demonstrate the protection that the Hardide CVD coating offers against water droplet and solid particle erosion,” said Hardide Technical Director Yuri Zhuk.

“Water droplet erosion damages the surface of steam and gas turbine blades, increasing turbine rotation drag and reducing efficiency. These tests have proven that the Hardide coating can protect the leading and trailing edges of the blades, which will increase their service life and maintain optimal turbine efficiency for longer, saving downtime and maintenance costs.”

The results were revealed Wednesday (March 13) at the Institution of Mechanical Engineers’ Steam Turbine Users Group conference in Manchester, during a joint presentation by Zhuk, Wolfgang Hahn, Commissioning Manager, Hinkley Point C (HPC) Nuclear New Build at EDF Energy and Business Development Manager, Robin Gillham.

   

Tagged categories: Coating Materials; Coating Materials; EU; Europe; Research and development; Testing + Evaluation

Comment from Avi Dwivedi, (3/19/2019, 1:11 PM)

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