Source: Dingsheng Thermal Technology’s high-temperature vacuum aluminum nitride sintering furnace is used for nitridation synthesis, such as synthesizing silicon nitride from silicon powder. The furnace consists of furnace walls and a furnace roof, which has an arch structure. It is equipped with electric heating elements, a nitrogen inlet system, and an exhaust system. The nitrogen inlet includes a nitrogen supply pipe, while the exhaust system has a dedicated exhaust pipe. The nitrogen supply pipe introduces nitrogen into the industrial furnace, and the exhaust pipe removes industrial waste gas and condensate.
Through long-term use, some defects have been found in vacuum aluminum nitride sintering furnaces that affect product performance, mainly in the following four aspects:
- Nitrogen Inlet Pipe Design: The nitrogen supply pipe enters the insulation layer from the furnace top. Nitrogen must pass through gaps in the insulation to reach the furnace chamber. Under normal conditions, nitrogen input is slow and delayed, which can affect the nitridation reaction time and thus reduce nitridation quality.
- Exhaust Pipe Position: The exhaust pipe is located on the lower two-thirds of the furnace sidewall. If waste gas and condensate are not completely removed from the furnace bottom, this can affect the vacuum level in the chamber and reduce nitridation quality.
- Furnace Roof Arch: The arch of the furnace roof is mostly constructed with specially shaped refractory bricks. Construction and maintenance are time-consuming, and thermal cycling can cause deformation and sagging of the arch, reducing the furnace’s service life.
- Furnace Chamber Lining: The interior walls are made of high-alumina bricks, which have a relatively short service life. Additionally, the furnace chamber’s small volume limits production capacity, affecting overall industrial output.