Horizontal furnace, also known as continuous sintering furnace, put molybdenum bars in the charging boat,
Sodium Tungstate put 12-18kg of molybdenum bars in each boat (too much material is easy to collapse in high temperature area), evenly sprinkle a small amount between molybdenum bars Zirconium oxide powder to prevent the sintered molybdenum strips from sticking to each other. In the process of continuous (or intermittent) pushing the boat, the molybdenum strips go through the low temperature zone, the high temperature zone and the cooling end in sequence, and are finally taken out from the discharge end. Reasonable design of heating belt temperature curve and control of boat speed can ensure the correct sintering system of molybdenum bars.
To control a reasonable sintering heating rate, the purpose of Jiangsu
Sodium Molybdate manufacturer is to fully volatilize the impurities in the molybdenum bar before densification, to prevent the cracking of the sintered molybdenum bar, and to obtain high-quality molybdenum bar.
According to the specifications of molybdenum strips and the particle size of
Molybdenum Powder, the sintering temperature in the high temperature zone is 1700-1850℃, and the sintering time is 3-5h. The horizontal tungsten wire (or
Tungsten Rod) muffle furnace used in China can generally sinter molybdenum rods of 80-100kg per day and night. Vertical tungsten rod (or tungsten mesh) furnace and intermediate frequency induction furnace are intermittent sintering furnaces. Molybdenum bars are loaded in the cold furnace state, generally 70-120kg per furnace. In order to reduce sintering bending, molybdenum wires can be used to sinter several molybdenum bars. *** together (especially the induction furnace sintering can only be charged vertically, it is easy to bend). After the furnace cover is covered, pass H2 (or vacuumize), adjust the power supply of the furnace, and heat up, keep warm, cool down and cool with the furnace according to the process regulations. The sintering process curve is shown in Figure 9-26b. The power supply time of the whole furnace period is about 1Oh. After the power supply is cut off, the hydrogen and water are stopped after about 10 to 12 hours (or the vacuum pump is stopped after 3 hours and then H27 to 8 hours), the furnace cover is opened, and the sintered molybdenum bars are taken out. The holding temperature and time are the same as those of the horizontal sintering method.
