Ask | Share | Grow™ - Question & Answer Community
Of the Members, By the Members, For the Members!
VacuumFurnaces.com is a Q&A community where vacuum furnace product and service suppliers connect with commercial and captive heat treaters to share their practical skills and know-how and to establish valuable relationships around niche topics of expertise with vacuum furnace end-users in operations, production, training, maintenance, marketing, sales, and engineering.
Difficulty In Reaching Appropriate Vacuum Level.
It sounds like you're dealing with a tricky vacuum issue. Since you've already been leak-checking the furnaces and haven't found any significant leaks when they’re cold, a few potential factors to consider could be: Thermal expansion-related leaks: As the furnace heats up, thermal expansion may causRead more
It sounds like you’re dealing with a tricky vacuum issue. Since you’ve already been leak-checking the furnaces and haven’t found any significant leaks when they’re cold, a few potential factors to consider could be:
Regarding hands-on help, you might consider contacting a vacuum furnace manufacturer for troubleshooting or a service technician visit. They have detailed knowledge and can offer specialized support for diagnosing and repairing the problem.
Alternatively, if you’re looking for local or regional expertise, industrial furnace service providers specializing in vacuum furnaces can assist with diagnostics and repair.
See lessFor bright annealing of 304 StSt, should I use a full backfill of hydrogen or perform a partial pressure control?
For bright annealing of 304 stainless steel (StSt), partial pressure control of hydrogen is often the more practical approach. However, it depends on the specific setup of your furnace and process requirements. For most applications, partial pressure control with hydrogen is recommended, as it proviRead more
For bright annealing of 304 stainless steel (StSt), partial pressure control of hydrogen is often the more practical approach. However, it depends on the specific setup of your furnace and process requirements. For most applications, partial pressure control with hydrogen is recommended, as it provides a balance between cost, safety, and the required surface finish. However, if your process has specific requirements for ultra-high brightness, you could consider increasing the hydrogen concentration, though not necessarily a full backfill.
See lessWhat are The Main Types of Vacuum Pumps and their applications?
Regardless of the technology, the essential functioning principle of an industrial vacuum pump stays the same. Air molecules (and other gasses) are removed from the vacuum chamber using vacuum pumps (or the outlet side if a higher vacuum pump is connected in series). The removal of extra molecules gRead more
Regardless of the technology, the essential functioning principle of an industrial vacuum pump stays the same. Air molecules (and other gasses) are removed from the vacuum chamber using vacuum pumps (or the outlet side if a higher vacuum pump is connected in series). The removal of extra molecules gets progressively difficult when the pressure in the chamber is lowered.
As a result, an industrial vacuum system must be capable of operating across a significant percentage of a very wide pressure range, often ranging from 1 to 10-6 Torr / 1.3 to 13.3 mBar of pressure. This is extended to 10-9 Torr or below in research and scientific applications. In a normal vacuum system, multiple types of pumps are employed to do this, each covering a section of the pressure range and working in series at times.
How to Choose a Vacuum Pump?
Several factors must be addressed while choosing a vacuum pump. To begin with, your choice should be personalized to your intended purpose, enabling you to choose the technology, lubrication, chemical resistance, vacuum level, and required flow rate.
When choosing a vacuum pump, the quality and goal vacuum level should be considered the most significant elements. The three types of vacuum are a rough or low vacuum, a high vacuum, and an ultrahigh vacuum. The scarcity of the number of molecules obtained, which is defined by residual gas pressure, is the difference between the three. As the pressure falls, the number of molecules per cm3 decreases. As a result, vacuum quality increases.
READ MORE: https://www.linquip.com/blog/types-of-vacuum-pump/ Source: Linquip Technews
See lessHow does a vacuum furnace roughing pump work?
The roughing pump is the component that primes the other pumps in series on the vacuum line, evacuating the system until a pressure level is reached at which a booster pump (known as a lobe-type roots pump) can be activated, followed by other types of diffusion, turbo molecular, cryogenic, ionic andRead more
The roughing pump is the component that primes the other pumps in series on the vacuum line, evacuating the system until a pressure level is reached at which a booster pump (known as a lobe-type roots pump) can be activated, followed by other types of diffusion, turbo molecular, cryogenic, ionic and other pumps that can be used when the pressure is reached.
Depending on the flow rate, the pumping system is proportioned in relation to system volume, pumping cycle speed, load degassing and contamination produced by the load (vapors, dust, binders, etc.) in the pump itself. It is for this reason that mechanical strength and wear influence the choice of pump type.
I highly recommend you to read an intersting article (splitted in two parts) about this topic:
Roughing pump in high-vacuum furnaces for beginners [1/2]
Roughing pump in high-vacuum furnaces for beginners [2/2]
See lessCFC, Graphite, or Moly, which is the best choice for vacuum ovens?
Hot zones are the hearth of every vacuum furnace. When purchasing a new furnace, you might face with the Hamletic doubt about hot zones: graphite-based or all-metal design hot zone? That’s the question! The graphite wafer is an excellent material. It allows operation at very high temperatures (up toRead more
Hot zones are the hearth of every vacuum furnace. When purchasing a new furnace, you might face with the Hamletic doubt about hot zones: graphite-based or all-metal design hot zone? That’s the question!
The graphite wafer is an excellent material. It allows operation at very high temperatures (up to 3000°C based on the vacuum level), has low density, reduced weight and modest thermal capacity. It creates the ideal black body conditions (emissivity about 1) inside the heating chamber for obtaining high uniformity.
All-metal hot zones are used in high demand industries where sensitive materials are processed, such as aerospace, electronics and medical. There are heat treatments that require a particularly clean environment or extreme vacuum levels. There may be different reasons: in some cases the chamber’s graphite could interfere with the process, resulting in unwanted carburation of the pieces treated. In other cases, the load could be particularly sensitive to the presence of residues in the oxygen or hydrogen atmosphere (which could lead to embrittlement of the pieces), and so graphite wafer degassing during the cycle could be damaging. In these circumstances, the user should opt for all-metal heating chambers (shields and resistor).
If you want more information on this topic and a detailed analysis of the differences, take a look at the following 2 articles:
See lessVacuum furnace hot zone: graphite vs all-metal design [1/2]
Vacuum furnace hot zone: graphite vs all-metal design [2/2]