High-Temperature Molybdenum Wire

The main structure of a high-temperature molybdenum wire carbonization furnace:

High-temperature molybdenum wire carbonization furnace is a continuous push molybdenum resistance wire heating furnace. The tungsten powder and carbon black are placed in the graphite boat, pushed in from the front furnace door, and carbonized through the high-temperature furnace tube. After the necessary process time, the tungsten carbide product is pushed out from the rear furnace door. The equipment is composed of a furnace body, high temperature resistant pure alumina furnace tube, front and rear entrance, and exit boat furnace doors, closed-loop continuous conveyor belt mechanism, automatic control, and heating system. Its core technology lies in the structure of the furnace body and temperature-resistant materials. In order to prevent high-temperature oxidation of tungsten powder, hydrogen should be introduced into the furnace tube for protection. At the same time, in order to prevent the oxidation of molybdenum wire, nitrogen should be introduced into the furnace bore to protect the heating molybdenum wire. Due to the special process, the insulation structure of the furnace bore and the assembled furnace tube puts forward higher requirements, and its furnace tube must be made of high-temperature resistant high-purity alumina material (purity above 97.3%) by molding.

Research on High-Temperature Molybdenum Wire Technology:

Molybdenum is a metal with a high melting point and high strength. Adding appropriate particle size and a trace amount of rare earth elements to molybdenum powder, high-temperature molybdenum plates, rods, and wires obtained by powder metallurgy and pressure processing methods, because of their low plastic-brittle transition temperature, it is difficult to recycle. High crystallization temperature (above 1800 ℃), good mechanical properties, and process properties after high-temperature annealing and recrystallization annealing, and are widely used in industry, national defense, electronics and other fields.

High-temperature molybdenum wire overcomes the shortcoming of the brittleness of pure molybdenum wire when used at high temperature, greatly prolongs the service life of the material, and is favored by the majority of users with its excellent comprehensive performance. At present, domestic scientific and technological workers in the same industry are actively developing high-temperature molybdenum series products. In view of the above reasons, it is particularly important to seek a reasonable, feasible, and economical production process for high-temperature molybdenum wire.

Test method for high-temperature molybdenum wire：

Select the same batch of high-temperature molybdenum powder, press and sinter 20 high-temperature molybdenum billets in the 1#~4# process, and use different blanking methods to draw different specifications of high-temperature molybdenum by processing methods such as rotary forging, chain pulling, turntable, and annealing. The microstructure and properties of the silk were also analyzed.

Test plan:

1# process high-temperature molybdenum powder - cold isostatic pressing forming bar - medium frequency induction sintering - rolling blanking - rotary forging - rough drawing - annealing and other processing methods.

2# process: high-temperature molybdenum powder - cold isostatic pressing forming bar blank - medium frequency induction sintering - swaging blanking - swaging - rough drawing - annealing and other processing methods.

3# process: high-temperature molybdenum powder - hydraulic press forming square bar - activation sintering - rolling billeting - rotary forging - rough drawing - annealing and other processing methods.

4# process: high-temperature molybdenum powder - hydraulic press forming square bar - activation sintering - swaging blanking - swaging - rough drawing - annealing and other processing methods.

Conclusion:

(1) After the 1# high-temperature bar blank is rolled and opened, the < 1.9mm high-temperature molybdenum wire has the most uniform structure, followed by 2#, 3#, 4# samples.

(2) After the 1# high-temperature bar blank is rolled and opened, it is processed into<0.6mm high-temperature molybdenum wire, and the dovetail tie-up tissue formed by recrystallization annealing is the most developed, followed by 2#, 3#, 4# samples.

(3) After the 1# high-temperature bar blank is rolled and opened, the mechanical properties in the subsequent processing process are better than the 2#, 3#, 4# samples.

(4) The high-temperature billet should be sintered with a round bar billet and an intermediate frequency induction furnace, and the rolling blank is an effective way to pull high-temperature molybdenum wire.

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