One Minute Mentor: Plasma Nitriding Equipment

Cold-walled (double-walled water-cooled) systems were the first generation of plasma nitriding furnaces. This technology is also a vacuum-based process but employs the principle of glow discharge to provide energy for heating and nitriding at one time. Therefore, the independent control of the temperature stability and the nitriding intensity is not possible because both processes are using the same energy source—the plasma.

The hot-wall plasma nitriding furnaces, the next generation of cold-wall ion nitriding systems, are mainly used and built now. This system ensures optimal nitriding quality by fulfilling the highest demands on temperature and nitriding process control. The big advantage of this technology is the separation of the control of the heating and the plasma nitriding parameters. The heating and temperature control of hot-wall plasma nitriding furnaces is realized by several independent heating/cooling zones, which guarantees optimal temperature homogeneity

For more information, click on the link below (subscription required). Then scroll to Figure 26. R Schneider; R. Mesquita; W Schützenhöfer, Distortion in Tool Steels, ASM International, 2014  https://doi.org/10.31399/asm.hb.v04d.a0005958

Solar Manufacturing receives US patent for a control thermocouple for vacuum heat treating furnaces

Solar Manufacturing,Sellersville, PA, announced that it has received US Patent #11,815,403 for an innovative control thermocouple design for vacuum heat treating furnaces. This new thermocouple offers a significant advantage in controlling operating temperatures from ambient up to 1200°F (649°C), particularly in smaller diameter hot zones of 36 inches (91.44 cm) or less.

In conventional control thermocouple designs, the outer ceramic protection tube acts as a heat sink under these conditions. This thermal conduction, or heat loss, is compounded by the shorter length of the thermocouple assembly, causing it to operate at a lower temperature. As a result, the furnace’s heating elements increase power output to maintain the set-point temperature, leading to a hotter workload temperature than the furnace temperature. This issue is more pronounced at lower processing temperatures below 1200°F (649°C).

The newly patented thermocouple configuration addresses these undesirable thermal conduction losses. It has demonstrated improvements in temperature uniformity survey results. Meeting AMS 2750 standard temperature uniformity specifications requires control thermocouples to be properly located within the hot zone for accurate survey thermocouple measurements without correction factors.

Read further here.

Beymetal Alüminyum rethinks innovation to improve Aluminum extrusion

Nitrex, Quebec, announced a collaboration with Beymetal Alüminyum, a leading player in the aluminum extrusion industry based in Türkiye, to modernize their nitriding capabilities.

In its commitment to excellence and pursuit of progress, Beymetal partnered with Nitrex to improve efficiency and scalability in their in-house nitriding operations. The installation of a Nitrex batch-type nitriding/nitrocarburizing furnace has unlocked new possibilities in process efficiency and production capacity for Beymetal.

The NX-1015 furnace model, with a 2,000 kg (4,400 lb.) capacity, is equipped with Nitreg® controlled nitriding and Nitreg®-C controlled nitrocarburizing technologies. These are specifically tailored for treating extrusion dies for aluminum profiles used in architectural applications. This advanced system ensures precise control over uniform case depths and nitride/nitrocarburizing layer formation, enhancing the mechanical properties of the extrusion dies. The result is a longer service life and increased output per die, ultimately lowering overall tooling costs for Beymetal. Additionally, the new installation contributes to more efficient use of production media and reduces electricity consumption.

“This Nitrex system is the first of its kind in Izmir and adds to our impressive record of over 30 installations across Türkiye. When discussing our partnership with Beymetal, it wasn’t solely about implementing a turnkey system but rather about fostering a relationship founded on trust and shared goals. Through a deep understanding of our customer’s needs, Nitrex delivered a solution tailored to their unique aspirations while also ensuring efficiency and sustainability,” noted Utku Inan, Nitrex sales representative in Türkiye.

read further here

Lindberg/MPH ships box furnace with automated load table to the aerospace industry

Lindberg/MPH, Riverside, MI, announced the shipment of a rod overbend box furnace with an automated load transfer table to the aerospace industry. This furnace will heat-treat parts under an inert atmosphere.

The heat-treating furnace has a maximum temperature rating of 2,000°F and a load capacity of 6,000 lbs. It features a workspace of 36” W x 96” D x 36” H and is designed for a nitrogen atmosphere. A nitrogen gas flow meter controls the atmospheric conditions.

The box furnace includes an automated load transfer table. Under the table, five fans with a variable-frequency drive provide accelerated cooling. The load table utilizes a pusher/puller mechanism to move parts trays in and out of the furnace.

The furnace’s radiant heating system uses heavy-gauge alloy rod over-bend heating elements mounted along the side walls and the floor. Two Watlow F4T controllers control and record the furnace temperature, allowing for seven zones of heating. The box furnace also meets Class 3 temperature uniformity of ±15°F at 1,000°F – 1,800°F.

Read further here.

The aviation industry chooses Seco/Warwick vacuum furnaces

Seco/Warwick, Meadville, PA announced that their previous furnace with an aviation industry client will be retired and replaced by a new, economical, and versatile furnace for brazing jet engine parts.

Seco/Warwick has been a recognized metal heat treatment equipment manufacturer for decades. In fact in many plants, units were manufactured in the 1980s and 1990s. The partners are gradually replacing these units with modern solutions, continuing to be loyal to the SECO/WARWICK brand.

“The aviation industry is a very important partner that has been cooperating with Seco/Warwick for decades. This is proof of satisfaction with the products we create, but also an expression of trust. Long-term, strategic, good relationships are key. Our furnaces are designed to operate without failure for many, many years, as evidenced by the replacement of this furnace after so many years,” said Maciej Korecki, vice president of the Vacuum Furnaces Segment at Seco/Warwick Group.

The new solution is based on a standard Vector vacuum furnace with a working space of 900x900x1200 mm, equipped with screen insulation and metal heating elements. It has been specifically adapted to meet the unique needs of the aviation industry, capable of heat treating complex jet engine components such as gears and main shafts.

This latest advancement underscores Seco/Warwick’s dedication to innovation and excellence, ensuring their continued partnership with the aviation industry for years to come.

Read further here.

One Minute Mentor: Process Control in Nitriding Systems

Modern gas nitriding and nitrocarburizing furnaces are equipped with sensor systems and a process control unit that allow the measurement and automatic control of the nitriding potential (KN). The figure shows an example of how the process control can be carried out. 

Defined amounts of ammonia, nitrogen, and—for nitrocarburizing processes—carbon dioxide, can be chosen for each step in the program and fed into the furnace via mass flow controllers. The gas composition in the retort is measured via a nitriding probe. For the measurement of nitrocarburizing processes two different probes are needed. The control unit calculates the nitriding potential according to the measured values and controls the mass flow of ammonia to meet the requested set point of KN. During the nitriding process the gasifying amount of ammonia can just be reduced to a certain limit. To keep the KN value low, therefore, precracked ammonia must be added. It must be mentioned that there are some more simple control systems available, which also produce good results.

For more information, click on the link below (subscription required). Then scroll to Figure 25. R Schneider; R. Mesquita; W Schützenhöfer, Distortion in Tool Steels, ASM International, 2014  https://doi.org/10.31399/asm.hb.v04d.a0005958

Preparation and high-temperature oxidation resistance of zirconium alloys

Researchers from the National Engineering Research Center for Instrument Functional Materials and Chongqing University, both in Chongqing, China, have highlighted the pivotal role of zirconium alloys in nuclear power systems. Their latest paper reviews the significant advancements in coating technologies for zirconium alloy fuel cladding, a crucial component in nuclear reactors. The study discusses various preparation methods, types of coatings, and their efficacy in resisting high-temperature oxidation—a key challenge for fuel cladding materials. This comprehensive review aims to serve as a critical reference in advancing the surface coating technology of fuel cladding zirconium alloys, promising enhanced performance and safety in nuclear power applications.

Read further here.

Can-Eng announces expansion with subsidiary Evergreen Kiln Technologies

EvergreenKilnTechnologies, LLC, based in Niagara Falls, USA, together with Suzhou Kilnpartner Mechanical Technology Co., Ltd., based in China, have announced a strategic partnership aimed at addressing the burgeoning needs of the North American Lithium-ion battery market. This alliance is poised to offer battery material producers advanced Kiln System solutions tailored for the production of cathode (LFP, NMC) and anode active materials.

As part of the arrangement, EvergreenKilnTechnologies LLC will function as a subsidiary under Can-Eng Furnaces International LTD., leveraging Can-Eng’s extensive 60-year expertise in designing and developing bespoke thermal processing systems.

The partnership extends across various domains, including marketing, brand collaboration, technology development, production, engineering, and after-sales services. The primary objective is to innovate thermal processing methods for battery powders, ensuring that the collaborative venture can deliver superior kiln solutions to clients across North America.

Read further here

Seco/Vacuum awarded nine-furnace contract

Seco/Vacuum, Meadville, Pa., announced it has secured a record-breaking contract for nine furnaces in June. The order includes three Vector vacuum Furnaces and six tempering furnaces, along with necessary auxiliary systems, marking a significant expansion for a returning heat-treat partner that already operates twelve Seco/Vacuum furnaces across North America.

The new furnaces are part of the heat-treater’s strategic shift from atmospheric heat treatment to vacuum processes. This transition aims to modernize their facilities, offering cleaner, safer, and more cost-effective operations. Vacuum processes also allow for finer control and reduce the carbon footprint, aligning with contemporary environmental standards.

The Vector® furnaces, known for their versatility in heat-treating processes like hardening, tempering, and brazing, will primarily be used for hardening due to their high-pressure gas quench capabilities. These furnaces ensure high uniformity and consistency in heat-treated parts, with enhanced batch processing speed and reduced energy and gas usage.

The accompanying Tempering Furnaces, designed for efficient atmospheric tempering, feature convection heating for faster process temperatures and smoother workflow integration, crucial during the often-congested tempering stage.

To support the intensive hardening cycles of the Vectors, six tempering furnaces were chosen to maximize throughput and efficiency. Each furnace, both vectors and temperers, are front-loading with a capacity of 3,300 lbs and dimensions of 36 x 36 x 48 inches.

The full modernization will require a temporary shutdown of existing operations. Seco/Vacuum will mitigate downtime by also acting as the general contractor, overseeing the installation of furnaces, systems, and necessary infrastructure, ensuring a swift resumption of operations with new capabilities.

Read further here.

Steel Dynamics announces leadership appointments

Steel Dynamics Inc., Fort Wayne, Ind., announced leadership appointments for James Anderson and Chad Bickford. Mark D. Millett, Chairman and CEO, expressed his excitement, praising their leadership qualities and positive influence within the company. Millett highlighted their commitment to the company’s core values of safety, performance, and innovation, and their focus on prioritizing personnel.

James Anderson has been named Senior Vice President of the Long Products Steel Group, effective May 1, 2024. Anderson, who will report to Barry Schneider, President and COO, brings a wealth of experience from his previous roles, including leading the Steel Fabrication business and serving as COO of New Millennium Building Systems. His new role will see him overseeing operations that include four EAF long product steel mills and various smaller facilities, together capable of shipping nearly five million tons of steel annually.

Chad Bickford will take over Anderson’s former position as Vice President of the Steel Fabrication Group, New Millennium Building Systems. Bickford, who also reports to Schneider, transitions from his recent role managing the Butler Flat Roll Steel Division. His extensive background in steel fabrication operations and leadership, including a stint as General Manager at the Virginia steel fabrication facility, prepares him well for his new responsibilities overseeing seven manufacturing facilities across the U.S. and Mexico.

Read further here.