General Electric Contact Materials
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| General Electric
Contact Materials ELCOMAT Cadmium Free Electric Contact Materials |
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| Material | Alloy
Composition (%) |
Specific Gravity | Hardness (Hv) |
Electrical
Conductivity (%) |
| Au | Au | 19.32 | 20.0 | 71.0 |
| Features | Stable metal without forming oxide films, soft and has the highest ductility. | |||
| Au-Ag | Au-Ag8% | 18.0 | 30.0 | 27.8 |
| Au-Ag10% | 17.8 | 30.0 | 24.6 | |
| Au-Ag25% | 16.3 | 35.0 | 16.0 | |
| Features | Au rich alloys have superior corrosion resistance, used mainly in micron current regions. Over 70% Au is needed for sulfurization resistance. | |||
| Au-Ni | Au-Ni5% | 18.3 | 135.0 | 12.9 |
| Features | Large mechanical strength, used as a countermeasure for Au adhesion. | |||
| Au-Ag-Pt | Au69%-Ag25%-Pt6% | 16.1 | 60.0 | 11.0 |
| Features | Large corrosion resistance, low and stable contact resistance. | |||
| Pt | Pt | 21.45 | 40.0 | 17.0 |
| Features | High melting point, high contact reliability, forms polymer in organic gases. | |||
| Pd | Pd | 12.0 | 40.0 | 17.0 |
| Features | High melting point, superior resistance to arcing, used as a substitute for Pt. | |||
| Pd-Ru | Pd-Ru10% | 12.0 | 180-280 | 4.0 |
| Features | High hardness, low transfer
and wear, suitable for applications for frequent make and break. |
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| Ag | Ag | 10.5 | 25.0 | 106.0 |
| Features | High electric and thermal conductivity, low sulfurization resistance, typical contact material. | |||
| Ag-Pd | Ag-Pd30% | 10.9 | 60.0 | 11.5 |
| Ag-Pd40% | 11.1 | 65.0 | 8.2 | |
| Ag-Pd50% | 11.2 | 75.0 | 5.7 | |
| Ag-Pd60% | 11.4 | 80.0 | 4.3 | |
| Ag-Pd70% | 11.5 | 90.0 | 4.3 | |
| Features | High hardness, good abrasion
resistance. Addition of Ag reduces catalytic activation. Addition
of over 30% Ag lessens sulfurizatin resistance. |
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| Ag-Ni | Ag-Ni0.03% | 10.5 | 40.0 | 106.0 |
| Ag-Ni10% | 10.3 | 65.0 | 91.0 | |
| Ag-Ni15% | 10.3 | 73.0 | 88.0 | |
| Ag-Ni20% | 10.2 | 80.0 | 83.0 | |
| Features | Annealing material
excepting Ag-0.03%NI. Ag-0.03%Ni is used as a countermeasure for a
change on standing of Ag. Low contact resistance. Good abrasion resistance,
but less welding resistance than Ag-CdO. |
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| Ag-Cu | Ag-Cu10% | 10.3 | 62.0 | 86.0 |
| Ag-Cu20% | 10.2 | 85.0 | 82.0 | |
| Ag-Cu40% | 9.8 | 95.0 | 82.0 | |
| Ag-Cu24.5%-Ni0.5% | 10.1 | 115.0 | 68.0 | |
| Features | Good electric and thermal conductivity, large mechanical strength and low cost. Prone to change chemically, lacks in resistance to oxidation and corrosion. Suitable for make and break contacts and sliding contacts with large contact force. | |||
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