How to Choose a Muffle Furnace?

2021-01-23 17:00:06
How to Choose a Muffle Furnace?
Muffle furnace, also known as resistance furnace, is generally used in laboratories of industrial and mining enterprises, universities and scientific research institutions to conduct chemical element analysis, quenching, annealing, tempering and other high-temperature heat treatment of small steel parts, as well as sintering, metal, stoneware and ceramics. Dissolution, analysis and other high temperature heating. At present, there are many varieties of muffle furnaces on the market, and it is inevitable to choose and compare in the procurement process. What should we pay attention to when buying a muffle furnace?

1. Temperature

Choose the high temperature of the muffle furnace according to the actual temperature. The high temperature of the muffle furnace is generally 100-200°C higher than the operating temperature.

2. Furnace size

According to the weight and volume of the sample to be burned, select the appropriate furnace size. Generally speaking, the volume of the furnace is more than 3 times the total volume of the sample.

3. Furnace material

Furnace materials are generally divided into two types: fiber materials and refractory brick materials

Fiber characteristics: light weight, soft texture, good insulation

The characteristics of refractory bricks: heavy weight, hard texture, general heat preservation

4. Power supply voltage

Before using, make sure the voltage of the muffle furnace is 380V or 220V, so as not to buy it wrong.

5. Heating element

According to the different requirements of burning samples, it is mainly based on different heating elements to determine what kind of furnace body to choose. Generally, resistance wire is selected below 1200°C, silicon carbide rods are basically used at 1300-1400°C, and silicon molybdenum rods are basically used at 1400-1700°C.