Sintered magnesium oxide filter
OwnerFeng Chi, Leonard S. Aubreyinventors
Life of this patent
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Abstract
A filter which is particularly well suited for filtering magnesium and magnesium alloys prepared by the process of: a) forming a slurry comprising a ceramic component wherein the ceramic component comprises: 50-99.5%, by weight, magnesium measured as the oxide; and 0.5-50%, by weight, at least one sintering aid selected from a group consisting of TiO2, ZrO2, CaO2, SiO2, Al2O3 and Fe2O3; b) coating the slurry on an open cell organic foam material to form a coated material; c) heating the coated material at a temperature sufficient to burn off the open cell organic foam material to form a structure; and d) sintering said structure to form said filter.
Claims21
A filter for filtering molten metal comprising:
- about 50-99.5%, by weight, MgO;
- and
- about 0.5-50%, by weight, at least one compound selected from a group consisting of TiO2, ZrO2, CaO2, SiO2, Al2O3 and Fe2O3.
A filter prepared by the process of:
- forming a slurry comprising a ceramic component wherein said ceramic component comprises:
- 50-99.5%, by weight, magnesium measured as the oxide;
- and
- 0.5-50%, by weight, at least one sintering aid selected from a group consisting of TiO2, ZrO2, CaO2 SiO2, Al2O3 and Fe2O3;
- coating said slurry on a reticulated organic foam material to form a coated material;
- heating said coated material at a temperature sufficient to burn off said open cell organic foam material to form a structure;
- and
- sintering said structure to form said filter.
The filter prepared by the process of claim 13 wherein said sintering aid is TiO2.
A process for purifying metal comprising the steps of:
- melting said metal;
- passing said molten metal through a porous filter wherein said porous filter comprises a primary ceramic component wherein said primary ceramic component consist essentially of:
- 50-99.5%, by weight, MgO;
- and
- 0.5-50%, by weight, at least one sintering aid selected from a group consisting of TiO2, ZrO2, CaO2, SiO2, Al2O3 and Fe2O3;
- and
- cooling said molten metal to form a purified metal.
A filter for filtering molten magnesium comprising:
- about 90-99.5%, by weight, MgO;
- and
- about 0.5-10%, by weight, at least one compound selected from a group consisting of TiO2, ZrO2,CaO2, SiO2, Al2O3 and Fe2O3.
Dependencies are inferred from the claim text.