B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 39/20 (2006.01) C03C 14/00 (2006.01) C22B 9/02 (2006.01)
Patent
CA 2136335
Filters for filtering molten light metals comprise a reticular foam formed from a composition comprising graphite, wollas- tonite, silica and a borosilicate glass and consist of a crystalline phase comprising graphite and wollastonite dispersed in a sub- stantially amorphous matrix of botosilicate glass. The filters can readily be machined accurately from large pieces of the filter material and they do not pick up moisture from the atmosphere when stored. The borosilicate glass used to produce the filters preferably has a softening temperature (T1) in the range of 600 °C, more preferably 650 °C to 900 °C and a melting tempera- ture (T2) in the range of 700 °C to 1100 °C, as measured according to the tests in German Standard DIN 51730.
Jones David L.
Stoetzel Reinhard
Swift Martin S.
Foseco International Limited
Gowling Lafleur Henderson Llp
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