Great Western Minerals Group Ltd. - becoming a fully integrated rare earth producer
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Magneto-Optic Alloys
Tb-Fe-Co based alloys are produced by LCM to a high degree of compositional control and with very low levels of critical impurities such as oxygen. Through expert selection of raw materials and by using closely controlled processing techniques, such alloys are manufactured to the most exacting of specifications.
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| Compositions and Purity | ||
| (Weight %) | ||
| Terbium plus Dysprosium | 40 - 70% | |
| Cobalt | 3 – 8% | |
| Iron | Balance | |
| Aluminium | <0.02 | |
| Silicon | <0.02 | |
| Calcium | <0.01 | |
| Transition metal impurities, each | <0.02 | |
| Oxygen | <0.05 | |
| Carbon | <0.005 | |
Individual compositions are usually set by the end-user, with alloys manufactured and supplied to specifications agreed between LCM and the customer.
Alloying additions
Gadolinium may be used as a substitute for terbium; tantalum and/or chromium are common additions to Tb-Fe-Co alloy systems.
Form
Material is routinely supplied in the form of powder, milled to a specified size requirement.
Quantity
Typical batch sizes for magneto-optic alloy powders range from 10kg to 50kg
Packaging
Inner: Aluminised laminate packs, vacuum-sealed to prevent oxidation.
Outer: Steel drums, typically with 20-50kg per drum.
Quality assurance
Production processes are part of our quality management system—certified to ISO9001: 2000 standard. Each batch is supplied with a Certificate of Conformance detailing the results of chemical and gas analysis and of particle size in compliance with specifications agreed with the customer.