UK engineers unlock 'protective bubble' tech for clean energy future

A groundbreaking new coating technique could bring the UK closer to a clean energy future, say boffins. Engineers at the University of Nottingham have developed a revolutionary plasma spray method. It creates super-strong, reliable tungsten-copper protective coatings for extreme environments.

What's the Big Deal?

For years, combining tungsten and copper has been a massive headache for engineers. These two powerhouse metals are brilliant for high-temperature jobs. Tungsten shrugs off extreme heat and wear, while copper whisks heat away.

But there's a catch: they expand at different rates when things get hot. This nasty habit often leads to cracks, stress, and early failure in critical components.

The 'Protective Bubble' Breakthrough

The Nottingham team, funded by the UK Atomic Energy Agency (UKAEA), found a clever way around this. They engineered a "functionally graded" coating. The material smoothly changes from copper-rich at its base to tungsten-rich at the surface.

This gradual shift hugely reduces stress and improves how the layers bond together. It's like building a bridge where the material seamlessly transforms. No more clunky, separate sections.

How It Works

The real genius lies in the new "shrouded axial injection atmospheric plasma spray system." Normally, when you plasma spray molten metal, oxygen in the air causes oxidation. This weakens the material.

But these clever engineers added a protective gas curtain – a "shroud" – around the plasma jet. This shield creates a "protective bubble." It stops unwanted reactions with air during spraying.

The result? "Ultra-low porosity" means fewer weak spots and significantly less copper oxide. This makes the coatings much denser and more structurally stable. They are way more durable than conventional methods.

Professor Hussain explained the impact: “By reducing oxidation, minimising porosity and tailoring mechanical properties across the coating thickness, the technology could extend component lifetimes, improve reliability and reduce maintenance costs.”

A Step Closer to Fusion

These super-tough coatings are crucial for industries facing extreme conditions, especially in fusion energy, space, and aerospace. Fusion energy, a cleaner alternative, relies heavily on these components.

Dr. Benjamin Evans from the UKAEA praised the innovation. He highlighted the challenge: “Tungsten is a vital part of virtually all tokamaks – its high melting point is a blessing for plasma facing components, but difficult for manufacturers to work with.”

He added: “The work that the University of Nottingham have demonstrated is a fantastic step towards bringing fusion energy to the UK.”

[Read the official report from University Newsroom](https://www.nottingham.ac.uk/news/engineers-develop-new-plasma-spray-technique)

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OFFICIAL SOURCE VERIFICATION: This report is based on official data from University Newsroom. Document: News - Engineers develop new plasma spray technique to deliver stronger, more reliable Tungsten–Copper protective coatings - University of Nottingham Source Link: https://www.nottingham.ac.uk/news/engineers-develop-new-plasma-spray-technique