Tungsten molybdenum and tungsten molybdenum alloy products have a series of excellent properties and are widely used in fields such as electronics, vacuum, coating, aerospace, petroleum, chemical, high-temperature structural components, and heating elements. Tungsten molybdenum and tungsten molybdenum alloy products are produced using powder metallurgy method, which first obtains pure tungsten molybdenum powder and alloy tungsten molybdenum powder through reduction method, and then obtains pure tungsten molybdenum and tungsten molybdenum alloy products through pressing and sintering. Sintering is a crucial and final process in powder metallurgy. Heating the tungsten molybdenum compacts at a temperature lower than the melting point of the metal causes shrinkage and densification, resulting in an improvement in the strength and physical and chemical properties of the tungsten molybdenum compacts. In the sintering production process of tungsten and molybdenum products, the medium frequency induction furnace is most widely used. Place tungsten molybdenum and tungsten molybdenum alloy billets into a medium frequency furnace crucible, use hydrogen gas as a protective atmosphere, and use electromagnetic induction principle to generate eddy currents in the crucible and sintered materials, causing the crucible and materials to heat up, thereby achieving the purpose of sintering.

In recent years, with the rapid development of electronics, vacuum, aerospace, mechanical manufacturing, and shipbuilding industries, the demand for large-sized tungsten and molybdenum products has increased. In order to meet the production needs of large-sized tungsten and molybdenum products, the specifications of intermediate frequency furnaces have also become larger. The larger the size of intermediate frequency furnaces, the more furnace loading, and the more severe the oxygen content exceeds the standard. By adjusting the hydrogen flow rate in the furnace, the oxygen content can be effectively reduced. Sintering in intermediate frequency furnaces is mainly characterized by large grain structure and is prone to ring crystal defects. By slowing down the heating rate, extending the insulation time, and increasing the hydrogen flow rate, the occurrence of ring crystal defects can be effectively reduced.

1. Temperature: One power cabinet with one furnace body Maximum operating temperature: 2600 ℃, commonly used temperature: 2400 ℃; Average heating rate ≤ 15 ℃/min

2. Temperature zone: Effective average temperature zone Net working size: Φ 900 x 1600mm; Each heat insulation material has a service life of over 100 heats

3. Vacuum: Cold state limit vacuum degree 1X10-1Pa, pressure rise rate ≤ 5pa/hour. Equipped with 1200 roots pump and 150 slide valve pump. Vacuum testing methods include online digital vacuum displays, vacuum meters, etc.

4. Heating method: medium frequency induction heating, fully sealed cabinet, 300KW rectifier, compensating capacitor, induction coil, clamp type wide copper plate electrode connection, manual/automatic operation and automatic conversion, etc. And implement the inverter system with protection interfaces for temperature measurement, control, faults, alarms, etc

5. Temperature measurement and control: Conductive (SHIMADA) FP-93 curve control PID regulator, 4-20mA input/output, dual color infrared thermometer 800-2500 ℃.

6. Furnace shell: 8mm thick double-layer 304 stainless steel water-cooled structure, capable of vacuuming under negative pressure and allowing for inflation to a micro positive pressure of ≤ 0.15MPa; Equipped with explosion-proof port, vacuum pipeline interface, filling hole, and equipped with operation and maintenance platform, escalator, safety fence bucket, etc.

7. Insulation material: The outer layer is made of corundum, the middle layer is made of soft felt, and the innermost ring is made of formed hard felt.

8. Material inlet and outlet method: The bottom of the furnace is lifted and equipped with a graphite clamp pot extraction device (the purchaser provides a workshop crane with a height of no less than 4.5 meters)

Power cabinet structure

1. Power cabinet color: beige spray painted

2. Door opening method: Front and rear doors are opened, and an automatic alarm device is designed when opening the door.

3. Rated output power (KW): 200KW

4. Using intermediate frequency (KHz): 1500~2500Hz

5. Input AC power supply: three-phase 380V ± 10% 50Hz

6. Rated DC voltage (V): less than 500

7. Rated DC current (A): less than 800

8. Rated output intermediate frequency voltage (V): less than 375

9. Feeding and discharging methods: lower lifting type, trolley manual/electric removal type