CO-NETIC AA and B
In fields of low intensity, CO-NETIC AA is used in order to utilize its high initial permeability and corresponding high attenuation characteristics. Available in either foil or sheet form in a convenient range of material thicknesses, CO-NETIC AA Alloy from Magnetic Shield Corporation can be specified as either Stress Annealed or Perfection Annealed.
Perfection Annealed CO-NETIC AA Alloy arrives annealed; increasing product performance by an order of magnitude, minimizing trial-and-error delays and costs.
CONETIC B is an alloy that has a slightly different formulation than CO-NETIC AA with attenuation characteristics between CO-NETIC AA and NETIC S3-6. It is useful in certain applications where the very high attenuation of AA is not needed.
Annealing CO-NETIC Alloys
Stress Annealed sheets are forming temper and commonly used for fabrication. To provide the maximum magnetic shielding properties, the shields require annealing after fabrication. Perfection Annealed sheets may be fabricated into shields that require no further annealing if severe forming or heliarc welding is avoided.
Perfection Annealed Foil, because of its thin cross section, can be rolled to cylindrical shape with minimal loss of magnetic shielding properties.
Finishing CO-NETIC Alloys
CO-NETIC AA, due to its high nickel content, is highly corrosion-resistant. Following annealing in hydrogen atmosphere, the material exhibits a clean and bright surface condition. As a consequence, CO-NETIC is frequently used "as annealed."
Standards:
- » MIL-N-14411C (specify composition)
» ASTM A753-78
» AMS-7701 and AMS-7702
» A host of other industry and customer specs.
Meets Quality Assurance requirements at no charge!
| Physical and Magnetic Data on Shielding Alloys | ||||
| Available Co-Netic Sizes | Co-Netic AA Perfection Annealed |
Co-Netic AA Stress Annealed* |
Co-Netic B Stress Annealed* |
|
| Specific Gravity | 8.74 | 8.74 | 8.18 | |
| Coefficient of Expansion, per °C x 10-6 | 12.6 | 12.6 | 8.3 | |
| Tensile Strength, PSI x 103 | 64 | 85 | 80 | |
| Yield Strength, PSI x 103 | 18.5 | 33 | 27 | |
| Modulus of Elasticity, PSI x 106 | 25 | 30 | 24 | |
| Hardness, Rockwell B | 50 Ref. | 70 Ref. | 68 Ref. | |
| Elongation in 2 inches | 27% | 32% | 32% | |
| Melting Point | 2650°F 1454°C | 2650°F 1454°C | 2600°F 1427°C | |
| Thermal Conductivity (cal/sec/cm2/cm/°c) at 20° | .138 | .138 | .037 | |
| Electrical Resistivity Micro-ohm-centimeters | 55 | 55 | 48 | |
| Saturation Induction (Gauss) | 8,000 | After required annealing is done, magnetic properties are same as those for Perfection Annealed sheet. | 15,000* | |
| Initial Permeability | 30,000 | 8,000* | ||
| Permeability at 40 B | 75,000 | 12,000* | ||
| Permeability at 200 B | 135,000 | 30,000* | ||
| Maximum Permeability | 450,000 | 150,000* | ||
| Induction at µ max. | 3,000 | 7,000* | ||
| Coercive Force Hc,Oersteds | .015 | .05 | ||
| Curie Temp. | 850°F 454°C | 850°F 454°C | 840°F 449°C | |
| Minimum Operating Temp. | 4°K | 4°K | 4°K | |
*Stress annealed material must be annealed after fabrication for optimum magnetic shielding properties. | ||||
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