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magnetic materials

permanent magnets based on intermetallic alloys

By using the coating procedure the flow properties of the powders can also be improved. The flowabillity measurements of coated powders show that we have so far achieved a 20% improvement in flowabillity, which is also an important result for industry. It is well known that the lost productivity and poor processing efficiency that results from powder segregation, choked transfer lines, funnel flow, rat holing, flooding, solidification is one of the main problems in powder processing. Poor fluidisation and poor control of the mass flow is a consequence of the powder cohesion. Figure shows the comparison between coated and non-coated powder.


The relationships between the shear (tau) to normal stress (sigma) ratio versus the shear rate for the uncoated
and coated powders.

 

comments & suggestions to:  sanja fidler