Molybdenum Electrodes
01
Description
Thanks to the low content of interstitial impurities and metallic impurities and the small-grain texture of the material, the finished products boast outstanding plastic properties.
Some of molybdenum's important features in terms of its industrial application include its high heat resistance, electric conductivity and heat conductivity, its relatively low thermal neutron capture cross-section with a volume weight almost twice lower than that of tungsten, etc. Molybdenum's resistance to creep and stress-rupture at high temperatures in a vacuum and in protective atmosphere (argon, hydrogen) is noticeably higher than the same properties of many metals used as the base for heat-resistant materials.
As a result of molybdenum's low temperature coefficient of linear expansion and its high melting point, it ensures the dependable functionality of structures made from molybdenum that operate at high temperatures.
Molybdenum's high thermal conductivity is several times greater than that of ordinarily used heat-resistant alloys, which prevents thermal stresses during rapid heating and cooling.
Molybdenum is resistant to the effects of acids, alkalis and resistive in many molten metals and liquid glasses.
02
specifications
The glass industry is one of the largest users of molybdenum metal. Experience has shown molybdenum to be a superior material for electric heating during smelting of glass and basalt. This industry's use of molybdenum in the form of electrodes is conditioned by the following characteristics of the material:
Mo99.95-PM electrodes are used in electric furnaces to smelt container and flat glass, technical glass, and basalt. Smelting glass and basalt in electric furnaces makes it possible to conduct the boiling process with greater productivity.
The chemical purity of electrode material (99.95% Mo) and the special program of temperature-deformation processing of stock used at JSC POLEMA allows for products with high density and resistance to creeping (deformation) at the working temperatures for glass boiling.
Molybdenum electrodes are supplied in the annealed condition in the form of mechanically processed rods or plates according to drawings agreed with the customer.
Based on the order, electrodes can be produced with connective cuts.
Electrode density is >99%, and Vickers hardness HV 10 ranges from 160 to 210.
To increase resistance to creeping (bending, deformation), the average grain size of the microstructure of electrodes upon delivery is set within the range from 50 to 300 microns.
Electrode length, and diameters of more than 80 mm, are set based on client request.
Dimensions of Mo99,95-PM electrodes:
- - high elasticity modulus, resistance to plastic deformation, and sufficient durability at the melting temperatures of glass and basalt;
- - good heat conductivity;
- - a low coefficient of heat expansion;
- - resistance to corrosion in molten solutions;
- - no influence on the color or transparency of glass;
- - good machinability.
Mo99.95-PM electrodes are used in electric furnaces to smelt container and flat glass, technical glass, and basalt. Smelting glass and basalt in electric furnaces makes it possible to conduct the boiling process with greater productivity.
The chemical purity of electrode material (99.95% Mo) and the special program of temperature-deformation processing of stock used at JSC POLEMA allows for products with high density and resistance to creeping (deformation) at the working temperatures for glass boiling.
Molybdenum electrodes are supplied in the annealed condition in the form of mechanically processed rods or plates according to drawings agreed with the customer.
Based on the order, electrodes can be produced with connective cuts.
Electrode density is >99%, and Vickers hardness HV 10 ranges from 160 to 210.
To increase resistance to creeping (bending, deformation), the average grain size of the microstructure of electrodes upon delivery is set within the range from 50 to 300 microns.
Electrode length, and diameters of more than 80 mm, are set based on client request.
Dimensions of Mo99,95-PM electrodes:
| Electrode type | Diameter d, mm | Allowance for d, mm | Roughness Raa | Length allowance, mm |
| Turned | 25 - 30 | ± 0,26 | 2,5 | <± 6,35 |
| 35 - 50 | ± 0,31 | 2,5 | ||
| 50 - 80 | ± 0,37 | 2,5 | ||
| Grind | 25 min | ± 0,08 | 1,25 |
03
advantages
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high purity of the material
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minimal content of interstitial impurities
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maximal density
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homogenous structure throughout the entire length
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high durability and operating endurance
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good machinability
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lack of effect on the color and transparency of glass
04
Product names
You can get full list of products by contacting our sales managers.: export_polema@metholding.com тел.:+7 4872 25-06-76.
05
chemical composition
Guaranteed chemical composition of Mo99,95-PM electrodes
Sample chemical composition of Mo99.95-PM electrodes of various diameters:
| Grade | Мo,% | Impurities, ppm, max | |||||||||||
| O | N | C | Fe | Al | Ni | Si | Mg | Na | K | Ca | W | ||
| Mo99,95-PM | >99,95 | 70 | 50 | 100 | 100 | 30 | 50 | 50 | 20 | 30 | 80 | 40 | 130 |
| ∑Fe, Si, Ni, Al, W, Mg, Na, K, Ca <400 | |||||||||||||
| Total content of metallic impurities <500 | |||||||||||||
Sample chemical composition of Mo99.95-PM electrodes of various diameters:
|
Electrode dimensions |
Мo, % | Impurities, ppm | |||||||||||
| O | N | C | Fe | Al | Ni | Si | Mg | Na | K | Ca | W | ||
| Ø48х1000 | >99,95 | 60 | 20 | 27 | 44 | 10 | 10 | 10 | 10 | 10 | 30 | 10 | 130 |
| Ø50,8х631 | 40 | 20 | 50 | 43 | 10 | 10 | 10 | 10 | 10 | 20 | 10 | 115 | |
| Ø63х1000 | 70 | 20 | 14 | 37 | 10 | 10 | 10 | 10 | 10 | 30 | 10 | 130 | |
06
miscellaneous
Molybdenum electrodes are supplied in an annealed condition in the form of mechanically processed rods or plates according to drawings agreed with the customer.
07
Application areas