In an industrial landscape where reliability is not merely an added value, but the beating heart of every successful project, TAV takes a new, decisive step towards excellence. We are proud to announce that we have obtained UL (Underwriters Laboratories) certification: not just a simple mark, but an international recognition that attests to our role as a cutting-edge technology partner for the US and Canadian markets.

The UL mark represents the world’s most rigorous safety standard for electrical and electronic systems. In North America, compliance with these protocols is subject to extremely stringent checks: the absence of the mark gives the local inspector (AHJ – Authority Having Jurisdiction) the power to block the installation of a system, triggering unforeseen costs and bureaucratic delays.

Thanks to this achievement, TAV has brought the certification process in-house. Today, we are able to design, manufacture and certify the electrical control panels for our furnaces directly at our headquarters, guaranteeing ‘plug-and-play’ products ready for immediate operation overseas.

Innovation and Safety: the DNA of a reliable partner

Achieving UL certification is not an end in itself, but tangible proof of our commitment to ongoing technological research. This achievement stems from the high level of specialisation of our technical team, which has acquired the necessary expertise to manage the entire lifecycle of electrical safety.

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In engineering, finding the perfect design is usually a matter of trade-offs. It requires finding the "sweet spot" between competing requirements that often pull a design in opposite directions. Vacuum furnaces are no exception to this rule.

When it comes to these requirements, energy efficiency is frequently at the top of the list, for two primary reasons: the optimization of production costs, where minimizing utility overhead is essential for protecting margins, and the growing environmental regulations affecting energy-intensive sectors like heat treatment.

A second, equally critical requirement is productivity. As industries scale toward high volume production, maximizing throughput is essential for maintaining a competitive edge. Within this framework, operational bottlenecks represent a significant risk to overall profitability and delivery schedule.  

So, if optimal design is supposed to be a balance between these polar opposites, what happens when a customer presents a seemingly simple demand: “I need to replace my old vacuum furnace, and I want the new one to have both higher productivity AND lower energy consumption.” 

Suddenly, that "sweet spot" feels a lot harder to find.

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Sintered rare-earth permanent magnets (REPMs), more specifically Neodymium-Iron-Boron (NdFeB) and Samarium-Cobalt (SmCo) varieties, are foundational to numerous modern technologies due to their unmatched magnetic strength. Their applications are widespread, from consumer electronics and medical devices like MRI machines to critical green technologies such as high efficiency motors in electric vehicles and generators in wind turbines. However, the extraordinary performance of these magnets is not simply a result of their chemical composition. It is critically dependent on achieving a precise and optimized microstructure, which is primarily developed through a powder metallurgy process.

Figure 1: REPMs can be found in a variety of consumer products, high-tech devices and critical green technologies

This manufacturing route involves several high temperature stages, most notably sintering and multi-stage heat treatments. Within this process, vacuum furnaces are a pivotal technology. They provide the stringently controlled atmospheric conditions essential for densification and for developing the specific microstructural features that give these advanced materials their exceptional magnetic properties. In this article, we will explore the critical functions of vacuum furnaces in the sintering and heat treatment of high performance NdFeB and SmCo magnets.

Powder metallurgy route for REPMs

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The TAV Performance LAB is a key strategic resource within the Research and Development (R&D) department of TAV VACUUM FURNACES, a centre of excellence where technology and innovation come together to create cutting-edge vacuum furnaces solutions.

Our laboratory houses a variety of highly specialised furnaces designed to support research and development activities aimed at perfecting heat treatment processes. Thanks to the wide range of technical features, numerous fundamental tests can be performed on metallic and ceramic materials, ranging from the most common heat treatment applications to advanced processes such as sintering, brazing and thermochemical treatments.

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Minting is a perfect example of where art meets science and technical expertise.

Masterfully designed coin artworks, created by skilled artists, are engraved into steel using a computer-controlled engraving machine to produce a reduction die.

The reduction die is then placed in a hydraulic press, where through high pressure, ranging from 100 to 400 tons, the design is transferred onto a softened steel block. This process results in a master die that contains a negative impression of the coin’s design.

The master die is then subjected to a hardening treatment and subsequently used to produce several negative dies, or working dies, intended for the actual coining process.

Once pressed, the minting dies are shaped, hardened, and sometimes plated to enhance durability. Depending on the type of coin being produced, a single set of minting dies can be used to strike millions of coins.

The minting industry relies on the precision and longevity of its tools and dies to sustain high production volumes. During the coining process, the workpiece is subjected to intense pressure, inducing plastic deformation on its surface to imprint the negative image onto the coin. Typically, two metallic dies strike the coin simultaneously, one for each side of the workpiece, ensuring sharp, detailed impressions with every strike.

Figure 1: A tool steel coining die (courtesy of Staatliche Münzen Baden-Württemberg)

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