Autoclaves play a critical role in industrial curing processes, where precise atmospheric control is essential for product quality and performance. And onsite nitrogen generators provide a continuous supply of high-purity nitrogen by separating it directly from compressed air, eliminating the need for delivered cylinders while reducing the risk of oxygen contamination during high-temperature curing cycles. Depending on the application and materials being processed, autoclave systems may require nitrogen purity levels ranging from 98% to 99.999%.
Advanced Gas Technologies has designed and installed nitrogen generating systems for autoclave operations across rubber vulcanization, polymer curing, electronics manufacturing, and aerospace composite facilities for over 30 years. Producing nitrogen onsite removes supply chain dependency, stabilizes operating costs, and ensures the inert atmosphere required for safe, consistent curing is always available.
How Are Autoclaves Used in Various Industries?
Autoclaves are used for a number of different industrial and chemical applications that require the use of high temperatures and pressurization for the purpose of curing various components safely and quickly. Depending on the size of the load and its contents, it can take anywhere between 15 minutes and several hours to complete a curing process. Autoclaves are used for the following applications:
Rubber Vulcanization Processes
Vulcanization is the process of using certain chemicals such as sulfur to harden rubber. Autoclaves are the perfect vessels to use for this process because they have the ability to regulate high temperatures and pressure conditions.
Polymer Curing and Coating Applications
Polymers are substances that are bonded together by similar material compounds. Used for many different industrial applications, polymers start off as liquids that are then hardened to form uniform membranes or protective coatings. Autoclave polymer curing is used to guarantee consistent and high-quality results for polymer products for various industrial purposes.
Artificial Crystal Manufacturing for Electronics
Autoclaves are used in the curing process of artificial crystals for electronics manufacturing because they’re the only system that can create the high temperatures and level of pressurization needed to create high-quality crystal products.
Aerospace Composite Manufacturing
Aerospace composite manufacturing is one of the highest-demand autoclave applications. Carbon fiber, Kevlar, and pre-preg fibre materials require a precisely controlled nitrogen atmosphere at purity levels of 99% to 99.999% to prevent oxidation during the curing cycle. PSA nitrogen generators are the standard choice for these operations due to their ability to sustain high-purity output continuously.
How Do Autoclaves Work in the Curing Process?
Autoclaves use pressurized heat at extremely high temperatures to cure various materials. Several stages are involved in the autoclave curing process.
First, there’s the loading period during which the vessel is filled with the materials that need to be cured.
Next, the heating and pressure system is turned on to heat up the unit and pressurize the autoclave with a nitrogen atmosphere to the desired pressure.
During this process, the temperature increasingly rises until it reaches the desired level. The temperature then stabilizes for a specified duration of time. Once the time is up, the vessel begins the cooldown phase, after which the chamber’s nitrogen atmosphere is depressurized, and the items can safely be removed.
Why Is Nitrogen Ideal for Autoclave Curing?
Nitrogen is an inert gas. It is used to stabilize the internal components of the autoclave before and after each curing session. This is crucial because autoclave chambers are frequently exposed to a wide range of chemicals and composite materials that can become highly combustible or hazardous if they come into contact with certain substances, especially oxygen.
Nitrogen is used to purge autoclave chambers in preparation for material curing and then a nitrogen atmosphere is maintained in the autoclave throughout the curing process.
How Do Onsite Nitrogen Generators Work for Autoclave Purging?
Depending on nitrogen purity requirements both membrane type and PSA type nitrogen generators can play an important role in the autoclave purging process. These systems generate nitrogen onsite by separating nitrogen from compressed air and supplying it directly to the autoclave chamber. During purging, nitrogen displaces oxygen and moisture to create a stable inert atmosphere that helps prevent oxidation, contamination, and inconsistent curing results.
Membrane nitrogen generators are ideal for applications requiring moderate purity levels and continuous flow, while PSA nitrogen generators are used for processes demanding ultra-high purity, such as aerospace composite manufacturing and electronics production.
Components of a Complete Autoclave Nitrogen Generation System
A complete autoclave nitrogen system typically consists of a primary air compressor, a nitrogen generator, a booster compressor to raise nitrogen pressure to autoclave operating levels, typically 17 to 22 bar for industrial curing applications, and a nitrogen storage buffer tank sized to deliver the surge volume needed at the start of each curing cycle. The nitrogen generator then maintains the atmosphere and recharges the buffer for the next cycle.
Benefits of Nitrogen Generators for Autoclaves
Installing onsite nitrogen generators for purging autoclaves is a more practical and economic choice for nitrogen supply. The alternative is to have pressurized nitrogen tanks delivered to your facility on a regular basis; however, deliveries can be unreliable and cost prohibitive. Any time there is a delay or a tank has to be changed out, it costs your facility money.
Producing nitrogen onsite guarantees consistency, safety, and cost savings. It also lowers the environmental impact of your operations by not having to transport nitrogen tanks. Onsite nitrogen generators produce a continuous supply of nitrogen, so there is never any risk of running out of inert gas at inopportune moments. That means no downtime for your facility (at least not due to a lack of nitrogen) and, more importantly, it significantly minimizes the risk of oxygen-related autoclave combustion.
To add to the cost savings, nitrogen generators can last up to a decade or longer even with continuous use as long as they are properly maintained.
Why Industrial Facilities Choose Our Autoclave Nitrogen Systems
Advanced Gas Technologies designs, engineers, and installs complete nitrogen generating systems for autoclave operations across North America. Our systems cover the full range of autoclave nitrogen requirements, from membrane generators for lower-purity continuous-flow applications to PSA systems producing nitrogen at 99.999% purity for high-performance aerospace composite curing. Every system is specified and sized to the facility’s actual autoclave cycle demands, purity requirements, and available infrastructure.
Contact us to discuss system sizing and specifications for your autoclave operation.