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| The very high oxidation
potential of rare earth metals and the propensity
for fine alloy powders to absorb oxygen (and nitrogen)
from the atmosphere, cause the production of high
quality sputtering targets to be a serious challenge. |
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Commercial uses of sputtering targets containing rare earths tend to use powder
metallurgy methods that are served by LCM alloy powder production methods. (Please
see Product Data Sheets on Magneto-Optic Alloys and Cast
SmCo Alloys).
LCM provides a service for supplying pure metals or alloys as sputtering targets.
The benefit of using a cast target is the possibility of keeping a very low impurity
level of oxygen or nitrogen. In offering to produce new alloys as sputtering
targets, full consideration is given to the potential physical properties of
the alloy based on knowledge of the materials and assessment of the appropriate
phase diagram.
Form
Targets are produced complete, bonded to a copper back plate as specified by
the customer.
Pure metals or alloys are melted using methods dependant upon their vapour pressure,
purity and quantity. These are part-machined (chemical analysis samples are taken
of the target material at this time) and bonded to the copper back-plate. The
target is finish-machined on the back-plate.
Vacuum Induction Melted Alloys
The physical properties of the rare earth alloy composition selected by the customer
for a sputtering target will determine the feasibility of producing a cast target.
For example, an NdFeB alloy is likely to be a possible cast target product due
to the relatively tough cast ingot; in comparison a pure intermetallic compound,
such as SmCo5 or LaNi5 are
extremely brittle and should be considered as a sintered powder product.
Rare Earth Metals
Sputtering targets can be prepared from most of the rare
earth metals though some of these are susceptible to oxidation in normal
atmosphere.
Quantity
Pure rare earth metal and cast alloy targets are not common.
Individual customer requirements need careful consideration. Preparation of these
targets may well form part of a Research and Development project and will be
produced as single items.
Packaging
Vacuum packing in multilayer aluminised laminate.
Quality assurance
Manufacturing processes are part of our quality management system – certified
to ISO9001: 2000 standard. Each target is supplied with a Certificate of Conformance
detailing the results from chemical analysis. |
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ISO9001:2000
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