What is the difference between a box type high-temperature furnace and a resistance furnace?

There are some differences in structure and function between box type high-temperature furnaces and resistance furnaces. The following is a detailed comparison between the two:

1. Definition and purpose
high temperature oven
Also known as muffle furnace, it is suitable for industries and departments such as electricity, coal, papermaking, petrochemicals, cement, agriculture and animal husbandry, pharmaceutical research, and teaching.
Mainly used for heat treatment, testing, sintering, etc. of various materials, such as heat processing, cement, small workpiece heat processing or treatment in the building materials industry, as well as drug inspection and medical sample pretreatment in the pharmaceutical industry.
Resistance furnace
It is a heating furnace that uses electric current to generate heat energy through resistive materials.
Used in the mechanical industry for heating before metal forging, metal heat treatment heating, brazing, powder metallurgy sintering, glass ceramic baking and annealing, melting of low melting point metals, drying of sand molds and paint film layers, etc.

2. Structure and Composition
high temperature oven
Usually rectangular furnace body, composed of steel plate, angle iron and insulation material, with insulation effect on the surface, which can control heat dissipation.
Adopting new insulation materials, it has small volume, light weight, good insulation effect, and fast heating speed.
The panel is made of stainless steel, with a beautiful appearance and exquisite craftsmanship.
The furnace is equipped with a controllable chimney, which is easy to operate and maintain.
Resistance furnace
Composed of an inner liner, insulation layer, heater, and bracket, the internal heater directly heats up without insulation function.
The heating element is a resistance wire or resistance strip, and the electric heating element has high heat resistance and high temperature strength, low temperature coefficient of resistance, and good chemical stability.
There are various types of resistance furnaces, including chamber type, well type, trolley type, push rod type, stepper type, muffle type, and tunnel type.

3. Heating method and temperature range
high temperature oven
There are various heating methods, and a PID automatic temperature controller can be used to control the temperature.
The temperature range is usually from 0 to 1000 ℃, and some high-temperature box furnaces can reach even higher temperatures, such as 1200 ℃ or 1400 ℃.
Resistance furnace
Using electric current to generate thermal energy through resistive materials for heating.
Low temperature furnaces operate at temperatures below 650 ℃, medium temperature furnaces operate between 650~1000 ℃, and high temperature furnaces operate above 1000 ℃.
High temperature and medium temperature furnaces are mainly heated by radiation, while low-temperature furnaces are heated by convective heat transfer.

4. Performance and Maintenance
high temperature oven
Good insulation effect, fast heating speed, and low external temperature of the furnace.
Multiple protective devices are installed to improve safety and reliability.
There are exhaust holes on the furnace body, and gas protection inlet and exhaust holes can be added according to user requirements.
Regular cleaning of the furnace and replacement of heating elements are required.
Resistance furnace
High heating efficiency, long service life, and more stable and reliable.
Accurate temperature control can be achieved through a PLC controller for precise temperature control.
Resistance furnaces are more expensive than box furnaces because they have faster heating speed and more precise temperature control, which can meet the demand for high-performance heating.
Maintenance is relatively simple, but attention should be paid to the replacement and maintenance of heating elements.

In summary, there are certain differences between box type high-temperature furnaces and resistance furnaces in terms of definition and purpose, structure and composition, heating method and temperature range, as well as performance and maintenance. The choice of equipment depends on specific application scenarios, workpiece materials, heating methods, temperature ranges, and other factors.