What are the types of box type resistance furnaces used in experiments?

There are various types of box type resistance furnaces used in experiments, which can be classified according to different standards. Let’s take a look at the types of box type resistance furnaces used in experiments below!

A commonly used 1200 ℃ experimental muffle furnace (click on the image to view product details)

1. Classified by working temperature
Low temperature box type resistance furnace: operating temperature below 1000 ℃. This type of furnace is commonly used for tempering and can also be used for heat treatment of non-ferrous metals. Due to the fact that low-temperature furnaces mainly rely on convective heat transfer, fan devices are often installed in the furnace to force gas flow, improve heat transfer efficiency, shorten heating time, and enhance heating uniformity. The characteristic of low-temperature box type resistance furnace is that it can avoid local overheating of the workpiece caused by direct radiation of electric heating elements. The workpiece is loaded in layers, and the heating is relatively uniform, but the loading and unloading are inconvenient and only suitable for heating small workpieces.
Medium temperature box type resistance furnace: The working temperature is between 1000 ℃ and 1200 ℃. This type of furnace is widely used for annealing, quenching, normalizing, and solid carburizing of carbon steel and alloy steel parts. The medium temperature box furnace produced in our country has been serialized, and the upper limit of the operating temperature is usually 950 ℃.
High temperature box type resistance furnace: operating temperature above 1200 ℃. High temperature box type resistance furnace is mainly used for quenching heating of high-speed steel cutting tools, high chromium steel molds, and high alloy steel, as well as rapid heating and high-temperature solid carburizing of general machine parts. The upper limit temperature of the high-temperature box furnace produced by Kejia Electric Furnace can reach 1700 ℃. The characteristic of a high-temperature box type resistance furnace is that the workpiece is heated in the high-temperature furnace, mainly by radiation heat transfer. The electric heating elements are directly arranged in the working chamber, and the furnace should have sufficient radiation area. The furnace wall is thicker and the furnace door is deeper to reduce the heat loss of the furnace wall and the heat radiation loss of the furnace door, and the sealing is better. There are no metal components inside the furnace, and the quality requirements for masonry materials are relatively high, often using high alumina bricks or silicon carbide products.

2. Classified by structural form
Vertical box type resistance furnace: The furnace body has a vertical structure and is suitable for placing workpieces with high heights or experiments that require vertical heating.
Horizontal box type resistance furnace: The furnace body has a horizontal structure and is suitable for placing long workpieces or experiments that require horizontal heating. It is a commonly used box type resistance furnace.
Split type box type resistance furnace: The furnace body and controller are set separately for easy operation and maintenance.
Integrated box type resistance furnace: The furnace body and controller are integrated together, with a compact structure, suitable for experimental environments with limited space.

3. Classified by heating element
Resistance wire heating box type resistance furnace: using resistance wire as the heating element, suitable for low or medium temperature heating, with a heating temperature generally below 1200 ℃.
Silicon carbon rod heating box type resistance furnace: using silicon carbon rods as heating elements, suitable for high-temperature heating. Silicon carbon rods have high temperature resistance, oxidation resistance and other properties, with a maximum heating temperature of 1400 ℃.
Silicon molybdenum rod heating box type resistance furnace: using silicon molybdenum rods as heating elements, suitable for ultra-high temperature heating. Silicon molybdenum rods have higher high temperature resistance and better oxidation resistance, with a maximum heating temperature of 1700 ℃.

4. Classified by atmospheric conditions
Ordinary box type resistance furnace: heated in air, suitable for most heat treatment experiments.
Atmosphere box type resistance furnace: can be filled with specific atmospheres (such as inert gases, reducing gases, etc.) to meet the needs of special heat treatment experiments.
Vacuum box type resistance furnace: heated by vacuum in a sealed state, suitable for experiments that require avoiding oxidation or precise control of the atmosphere.

Multi sided heating box furnace, this type of box furnace has a more uniform temperature field (click on the picture to view product details)

In general, there are various types of box type resistance furnaces used in experiments, and suitable types can be selected according to experimental needs.Click to learn more muffle furnaces! Or click on online customer service to learn more about product information!