How to choose a lifting bell jar furnace?

The lifting type bell jar furnace, as an efficient and flexible heat treatment equipment, has great advantages in material processing, industrial production, and scientific research fields. It is widely used in processes and fields such as powder metallurgy, metal material heat treatment, and high-temperature atmosphere sintering. Let’s take a detailed look at this furnace below!

Customized bell shaped lifting high-temperature muffle furnace (click on the picture to view product details)

1. Clarify application scenarios and requirements
Material type:
Metal materials (such as steel and titanium alloys) need to pay attention to their vacuum or inert gas protection capabilities to avoid oxidation.
Ceramic materials such as alumina and nitrides require high temperature uniformity to ensure densification.
Electronic components such as semiconductors and sensors require high-purity atmosphere control to prevent contamination.
Powder metallurgy (such as hard alloys) needs to pay attention to infiltration and alloying functions.

Process requirements:
Annealing and tempering require precision control in the low-temperature zone; Sintering requires a high temperature zone heating rate.
Vacuum brazing requires high vacuum degree (such as ≤ 10 ⁻ ³ Pa); Gas flow control is required for atmosphere sintering.

2. Temperature control performance
Temperature control accuracy:
Priority should be given to PID intelligent temperature control system, with temperature control accuracy within ± 1 ℃, to ensure process repeatability.
Example: Most models of bell jar furnaces use 30 segment programmable control to meet complex temperature curve requirements.

Heating rate:
The resistance of the resistance wire heating element varies greatly in the medium temperature range (300 ℃~800 ℃), and an intelligent power regulator is required to avoid surge current.
Silicon carbon rod heating elements have a long lifespan, are easy to replace, and are suitable for rapid heating in high-temperature areas (≥ 1200 ℃).

Temperature uniformity:
Independent temperature control technology can reduce the temperature difference inside the furnace (such as within ± 5 ℃), ensuring consistent material properties.

3. Furnace structure and design
Lifting method:
Screw screw lifting: High precision, suitable for laboratory small-scale production.
Hydraulic lifting: With high load-bearing capacity, it is suitable for large-scale industrial production.

Furnace material:
Aluminum oxide polycrystalline fiber: has good insulation performance and is more energy-efficient.
Lightweight ceramic fiber: lighter weight, faster heating speed.

Furnace door design:
The lower opening furnace door is convenient for loading and unloading, reducing heat loss; The air curtain sealing technology can further enhance the insulation effect.

4. Heating system and components
Heating element type:
Silicon molybdenum rod: Good high-temperature stability, but difficult to control in the medium temperature range.
Silicon carbon rod: has a longer lifespan and is suitable for continuous production.
Molybdenum containing resistance wire: Low cost, suitable for low-temperature applications (≤ 1000 ℃).

Power matching:
Select the power according to the furnace size to avoid slow heating caused by insufficient power.

5. Safety and operational convenience
Security function:
Overtemperature and power outage alarm to prevent equipment damage.
Overcurrent and leakage protection to ensure the safety of operators.

Control system:
For those who have requirements for operation, they can choose the touch screen to dynamically display the heating curve, and the built-in paperless recorder function is convenient for data tracing.
USB serial port supports data export.

6. After sales service
After-sales service
Prioritize choosing vendors that provide customized services to reduce investment risks.
Confirm the warranty period (usually 1 year) and spare parts supply capacity to reduce downtime.

Elevating hydraulic bell jar atmosphere furnace (click on the picture to view product details)

In summary, when choosing a lifting bell jar furnace, it is important to pay attention to the above aspects. You can click on the online consultation button on the right before making the selection to communicate with relevant technical personnel about the parameters, so as to customize a lifting bell jar furnace that is more suitable for your own production or experiment!Click to learn more customized muffle furnaces! Or click on online customer service to learn more about product information!