Optimization atmosphere furnace cooling rate

Traditional depends mainly on the furnace atmosphere furnace cooling water circulation inside the sandwich away part of the heat, the cooling speed is relatively slow. Sometimes up to 36h or so to cool to about 150 ℃.
The high-performance cores require rapid cooling, the design presented in the following optimization program:
(1) Cycle Air Act: cooling the charge into the furnace through the nitrogen to pour out of the tower, and then into the furnace, recycled. Meanwhile, in order to prevent leakage, to continue to add part of the nitrogen gas into the furnace to ensure the nitrogen partial pressure in the furnace.
(2) Box bottom openings, and the cold side of the silicon molybdenum rod gap forming gas convection, take away box furnace heat;
(3) The box-type furnace purged with nitrogen, the heat away sintered product;
(4) accelerate the rate of water flow within the furnace sandwich. These types of programs can be used simultaneously, the cooling time can be shortened to about 15h.