Two all-metal hot zone furnaces were recently shipped to the medical and additive manufacturing industries. Solar Manufacturing created and shipped the Models HFL-3848-EQ and HFL-3836-EQ, both featuring metallic-insulated hot zones, a load weight capacity up to 2,000 lbs., and a maximum operating temperature of 2400° F. Measuring 24” wide x 24” high x 48” deep, and 24” wide x 24” high x 36” deep respectively, each furnace was designed with the SolarVac Polaris® Control System. The furnaces were shipped to a location in Tennessee.
Dan Insogna, Southeast Regional Sales Manager for Solar Manufacturing
“Solar Manufacturing was awarded the order because we offered the best solution for their vacuum furnace needs,” states Dan Insogna, Solar’s Southeast Regional Sales Manager. “Our knowledge and experience of the additive manufacturing market set us apart from the competition. Additionally, the customer found the premium features and benefits offered with our vacuum furnace equipment impressive. We’re pleased to have helped them select furnaces that best suit the unique requirements of the industries they serve.”
Nitrex, a global provider of fully integrated heat-treating solutions and technologies based in Montreal, Canada, acquired G-M Enterprises, a manufacturer of vacuum furnaces, headquartered in Corona, California.
Mrs. Veena Jhawar, G-M Enterprises COO; Mr. Jean-François Cloutier, Nitrex CEO; Mr. Suresh Jhawar, G-M Enterprises President
The addition of G-M Enterprises will further expand Nitrex’ integrated heat treatment solutions to customers; both share the same goal of providing technologies that focus on customer workflow and efficiency while maximizing the life span and quality of engineered parts and components.
Jean-Francois Cloutier, Nitrex CEO
“This acquisition will allow Nitrex to bolster its turnkey solutions business by bringing a new, innovative and broader mix of heat treatment systems to our customers,” said Jean-Francois Cloutier, Nitrex CEO. “We also look forward to welcoming the entire G-M Enterprises’ team into the Nitrex family.”
“Joining forces with Nitrex and becoming part of its family of companies will ensure we keep pace with our customers’ evolving needs and expectations,” says Suresh Jhawar, G-M Enterprises President. “What this means for the future of G-M Enterprises is an opportunity to enhance our products and services, expand our international presence further by leveraging the resources, expertise, and capital of Nitrex.”
Heat Treat 2019 was just a month ago, and one of the great benefits of gathering with a community of heat treaters is the opportunity to challenge old habits and look at new ways of doing things. Heat TreatToday’s101 Heat TreatTips is another opportunity to learn the tips, tricks, and hacks shared by some of the industry’s foremost experts.
Today’s Technical Tuesday features tips from Grammer Vacuum Technologies covering Vacuum Furnace and Cooilng.
If you have a heat treat-related tip that would benefit your industry colleagues, you can submit your tip(s) to doug@heattreattoday.com or editor@heattreattoday.com.
Heat TreatTip #59
Oxygen Contamination Sources
A common source of oxygen contamination to vacuum furnace systems is in the inert gas delivery system. After installation of the delivery lines, as a minimum, the lines should be pressurized and then soap-bubble tested for leaks. But even better for critical applications is to attach a vacuum pump and helium leak detector to these lines with all valves securely closed, pull a good vacuum, and helium leak check the delivery line system. Helium is a much smaller molecule than oxygen and a helium-tight line is an air-tight line. Also, NEVER use quick disconnect fittings on your inert gas delivery system to pull off inert gas for other applications unless you first install tight shut-off valves before the quick disconnect. When the quick disconnect is not in use, these valves should be kept closed at all times. (Though the line is under pressure, when you open a back-fill valve to a large chamber, the line can briefly go negative pressure and pull in air through a one-way sealing quick disconnect valve.)
Air-cooled vacuum furnace cooling system (from Dry Coolers)
Heat TreatTip #80
Closed-Loop Water Cooling Systems
Modern water cooling systems for vacuum furnaces are typically closed-loop. (By this we mean that air never comes in contact with the water that goes through your vacuum furnace. The expansion tank would be pressurized with dry nitrogen, in this case, to prevent oxygen pick-up by the water.) Sometimes after maintenance work, the expansion tank or sump is left open to air. As a result, air/oxygen, dirt, and organic materials can get into the water system and eventually cause both corrosion and plugging of your chamber. A plugged chamber can overheat and explode or implode causing serious injury or death. Replacement chambers are very expensive. A recirculating water system that allows air to contact the water entering your furnace can dramatically decrease the life of your vacuum chamber.
Heat TreatTip #89
Lanthanated Moly Alloy Strip Increases Element Longevity
Moly and TZM moly grids can double or triple vacuum furnace throughput by using a two-tier or three-tier fixture to utilize unused work zone space.
Pure molybdenum vacuum furnace heating elements distort with time in service due to growth and contraction during thermal cycling. You can often see this distortion beginning just a month or two into service of new elements. Eventually, these will contact either the insulation/shield wall— or worse yet, your parts—and cause electrical arcing. So they need to be replaced before this happens. By making a direct replacement of these pure moly strips with a lanthanated moly alloy strip, the life of the elements can be significantly increased. We have seen a rough doubling of the element life by making this change. Many new OEM vacuum furnaces are now supplied with lanthanated elements at the start. OEM and aftermarket hot zone re-builders are frequently making this change as well to get longer life out of their hot zone elements.
Heat TreatTip #101
TZM Moly Alloy for Structural Vacuum Furnace Components
For over 30 years, there has been a molybdenum alloy called TZM (Moly-0.5%Ti-0.1%Zr) which is far superior to pure molybdenum in vacuum furnace structural applications. TZM is slightly more expensive than pure moly, so OEM furnace companies use pure moly to keep their costs down for competitive reasons. But they could be offering it as an option for their buyers. Pure molybdenum metal undergoes recrystallization at temperatures as low as 2000°F. The recrystallized structure is very brittle at the grain boundaries, resulting in a structural component that also is very brittle. If you have a vacuum furnace with moly components, you have undoubtedly seen this with older parts. TZM alloy, however, does not recrystallize until around 2500°F, and even then it does not exhibit the brittle behavior of pure moly, because the recrystallized grain size is still very fine. TZM is also stronger than pure moly, as much as 3 to 4 times the strength at temperatures above 2000°F. For a 10-15% premium in cost, you can dramatically extend the life of your moly structural components in your furnaces.
