Sliver Tungsten Alloy
Silver tungsten alloy (W-Ag) is also called tungsten silver alloy, is the composite of tungsten and silver. High conductivity, thermal conductivity, and a high melting point of silver on the other hand high hardness, welding resistance, small material transfer, and high burning resistance of tungsten are combined into silver tungsten sintering material. Silver and tungsten are not compatible with each other. Silver and tungsten binary alloys are typically manufactured via powder metallurgy. For tungsten content over 60%, we will use the infiltration method. The properties of Tungsten composites are related to the silver-to-tungsten ratio. While tungsten content improves, the electric arc and wear resistance will increase, the thermal and electrical conductivity will reduce.
Tungsten Silver Alloy Applications
Silver tungsten alloy is mainly used in electrode materials and welding materials, such as a low-voltage automatic switch, high voltage circuit breakers and protection switches, and so on.
Specifications of Silver Tungsten Alloy
W-Ag rods, bars, sheets, plates, and tubes of different sizes.
W-Ag electrode and contact
.
Silver Tungsten Alloy Properties
|
Grade |
Ag
% |
Total Impurities
%
(≤) |
W
% |
Density
g/cm3
(≥) |
Hardness
HRB
(≥) |
Resistivity
μΩ·cm
(≤) |
Conductivity
IACS/%
(≥) |
Bending Strength
Mpa
(≥) |
|
AgW30 |
70±1.5 |
0.5 |
Bal. |
11.75 |
75 |
2.3 |
75 |
|
|
AgW40 |
60±1.5 |
0.5 |
Bal. |
12.4 |
85 |
2.6 |
66 |
|
|
AgW50 |
50±1.5 |
0.5 |
Bal. |
13.15 |
105 |
3 |
57 |
|
|
AgW55 |
45±1.5 |
0.5 |
Bal. |
13.55 |
115 |
3.2 |
54 |
|
|
AgW60 |
40±1.5 |
0.5 |
Bal. |
14 |
125 |
3.4 |
51 |
|
|
AgW65 |
35±1.5 |
0.5 |
Bal. |
14.5 |
135 |
3.6 |
48 |
|
|
AgW70 |
30±1.5 |
0.5 |
Bal. |
14.9 |
150 |
3.8 |
45 |
657 |
|
AgW75 |
25±1.5 |
0.5 |
Bal. |
15.4 |
165 |
4.2 |
41 |
686 |
|
AgW80 |
20±1.5 |
0.5 |
Bal. |
16.1 |
180 |
4.6 |
37 |
726 |
Process of Silver Tungsten Alloy
Dosing – Mixture powder – Pressing – Sintering – Polishing – Inspection.
Silver Tungsten Electrode
Silver tungsten electrical contact will generate mixed oxides, if it is frequently off in the air, under operating current, in the result that will produce the surface film, which can increase the contact resistance. It is used widely in the engine, electric power, electron, metallurgy, spaceflight, and aviation industries.
Silver WC Alloy Properties
|
Grade |
Ag
% |
WC
% |
Density
g/cm3
(≥) |
Conductivity
IACS/%
(≥) |
Hardness
HRB
(≥) |
|
AgWC50 |
50±2 |
Bal. |
12.20 |
29 |
85 |
|
AgWC40 |
60±2 |
Bal. |
11.7 |
34 |
75 |
|
AgWC30 |
70±2 |
Bal. |
11.2 |
36 |
57 |
Advantages of Silver WC Alloy
● High arc erosion resistance
● Excellent electrical conductivity
● Outstanding contact welding resistance
● Very low chopping current
Typical Silver Tungsten Alloy Products
Silver tungsten plate;
Silver tungsten bar;
Silver tungsten electrode.
Advantage of Tungsten Silver Alloy
1. High conductivity, high hardness
2. High heat conductivity
3. Wear resistance, resistance to the burning of the arc
Production Technology of Silver Tungsten Alloy
It is manufactured by a process involving pressing, sintering, and infiltrating with the silver under strictly controlled conditions. Tungsten based composites are strong refractory metal materials with superior heat, electric arc, wear and deformation resistance at high-temperature welding, flash butt, and spot welding. They have excellent electrical and thermal conductivity. The properties of Tungsten composites vary according to the silver-to-tungsten ratio. If the tungsten content improves, the electric arc and wear resistance will increase, and on the other hand, the thermal and electrical conductivity will reduce.
