Molybdenum electrode

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Molybdenum electrode
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Electrode density comparison

Electrode Size Density
Pure molybdenum electrode Ø 30.0 – 101.0 mm >10.0
Ø ≥ 101.0 mm >9.90

Comparison of chemical properties of Molybdenum Electrodes

Molybdenum is corrosion-resistant when the atmospheric humidity is below 60%, and will only show slight oxidation at higher humidity.
Molybdenum is no longer corrosion resistant in alkaline and oxidizing liquids at temperatures above 100°C.
For applications using Molybdenum in oxidizing gases and elements above 250°C, Alloy Hit develops anti-oxidation coating electrodes to prevent the Molybdenum Electrode from being oxidized.
Glass solutions, hydrogen, nitrogen, inert gases, metal melts and oxide ceramics will not attack Molybdenum even at very high temperatures.

Greater than 60% humidity(higher temperature) Alkaline/oxidizing liquid below 100℃ High temperature oxidizing atmosphere Glass solution Metal solution/oxide ceramic
Slightly oxidized preservative Si, Mo based anti-oxidation coating Does not corrode Does not corrode

Alloy Hit’s Molybdenum Electrodes are all made of powder metallurgy of Molybdenum powder with a purity of more than 99.97%. They have good machining performance, formability and welding performance, and their deformation is more than 60%, and are then machined.
In terms of dimensional tolerances or machining, Alloy Hit can fully meet customer requirements.

Features of Molybdenum Electrode

Covering all specifications and sizes, the maximum diameter can be 203.2mm
Using forging process, long service life
High purity, melting point 2620℃
High electrical and thermal conductivity
Corrosion resistance and good stability
Excellent creep resistance

Electrode composition comparison

Item Unit ASTM B387 Control Value Alloy Hit Valule
Main chemical content % ≥99.95 ≥99.97 ≥99.97
Al ppm / ≤10 1
Cr ppm / ≤20 3
Cu ppm / ≤20 2
Fe ppm ≤100 ≤20 10
K ppm / ≤20 10
Ni ppm ≤50 ≤20 10
Si ppm ≤100 ≤20 10
W ppm / ≤300 169
C ppm ≤100 ≤30 13
H ppm / ≤10 /
N ppm ≤20 ≤10 5
O ppm ≤70 ≤40 40
ZrO2 % / 1.68±0.17

Comparison of Electrode physical properties

Item Temperature/℃ Value
Melting point / 2623℃
Resistivity /Ω.m 20 0.07
500 0.18
1000 0.32
1500 0.45
2000 0.59
Thermal conductivity /W/(M.K) 20 143
400 127
800 117
1000 98.8
Thermal expansion coefficient /1/K 20 5.1
400 5.4
600 5.6
800 5.8
1000 6
1200 6.2
1400 6.4

Electrode performance comparison

The following data takes an electrode with a diameter of Φ76.2mm as an example.

Electrode Temperature /℃ ASTM Alloy Hit
Tensile strength /MPa Elongation after break % tensile strength /MPa Elongation after break %
Pure molybdenum electrode Room Temperature 450 10 486 15.7

Electrode high temperature durability performance

Electrode Size Alloy Hit
Pure molybdenum electrode Ø 50.8mm deformation 0.37%
At 1200℃, 200MPa stress, 1000 hours

Electrode recrystallization performance comparison

Electrode Size Deformation 60% Deformation 90%
Pure molybdenum electrode Ø 50.8mm 1250℃ 1100℃

Features of Molybdenum Electrode

  1. Coating composition: Si, Mo (coating containing these two elements can achieve anti-oxidation effect, and impurities may be introduced when too many elements are added);
  2. Structure after coating: substrate, transition layer, coating, self-healing layer;
  3. ·3000 hours, 1200℃
    ·500 hours, 1400℃
    ·72 hours, 1600℃