The muffle furnace is also called resistance furnace. It is generally used in laboratories of industrial and mining enterprises, universities and research institutes for chemical element analysis and for high temperature heat treatment such as quenching, annealing, and tempering of small steel parts; it can also be used for metal, stoneware, etc. It is used for high temperature heating such as sintering, dissolving and analysis of ceramics. At present, there are many types and brands of muffle furnaces on the market, and it is inevitable to choose and compare during the procurement process. So what indicators should be paid attention to when buying a muffle furnace?
temperature
According to the actual use temperature, choose the highest temperature of the muffle furnace. Generally, it is better for the maximum temperature of the muffle furnace to be 100~200℃ higher than the operating temperature during use.
Furnace size
Choose the appropriate furnace size according to the weight and volume of the sample to be fired. Generally, the furnace volume should be more than 3 times the total volume of the sample.
Furnace material
Furnace materials are roughly divided into two types: fiber material and refractory brick material
Fiber characteristics: light weight, soft texture, good heat preservation
The characteristics of refractory bricks: heavy weight, hard texture, general heat preservation
voltage
Before use, you need to determine whether the muffle furnace’s operating voltage is 380V or 220V, so as not to buy it wrong.
Heating element
According to the different requirements of the fired samples, different heating elements are mainly used to determine what kind of furnace body to choose. Generally, resistance wire is used below 1200℃, silicon carbide rod is basically used for 1300~1400℃, and silicon molybdenum rod is basically used for 1400~1700℃.
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