Filters made from chemical binders and microspheres
a technology of chemical binders and filters, applied in the field of filters made, can solve the problems of metal contamination by filters themselves, metal contamination by filters, and the inability to significantly address design flexibility, and achieve the effects of reducing the rate at which heat is absorbed, easy primeing, and low manufacturing cos
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[0050] While the invention has been described with reference to a preferred embodiment, those skilled in the art will understand that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims. In this application all units are in the metric system and all amounts and percentages are by weight, unless otherwise expressly indicated.
examples 1-2
Filters Integrally Formed in Pouring Cup
[0051] Insulating slotted and round hole filters were integrated with a pouring cup. Samples were made by blowing a blend of 100% SG grade microspheres bonded with 10% EXACTCAST® 101 / 201 cold box resin. This mix was used to make a filter integrated into a pouring cup. The filter mix was blown into the pouring cup pattern that had been modified with pins on the bottom that would make the filter openings. See FIG. 5. The mix was then gassed with triethylamine in nitrogen at 20 psi according to known methods described in U.S. Pat. No. 3,409,579. Gas time is 0.5 seconds second, followed by purging with air at 20 psi for about 15 seconds. The slotted filter was made by cutting slots in the bottom of a solid bottom cup. See FIG. 6. These designs created a one piece pouring cup with an integrated filter on the bottom of the cup. The holes were distributed across the entire surface of the filter. A traditional pressed ceramic filter was also tested a...
examples 3-4
Preparation of the Insulating Formula for Making Filters
[0052] Insulating round hole filters were prepared by drilling and machining the forms from a slab of insulating material. The slab was made by mixing 100% SG grade microspheres with 10% PEP SET® X1000 / X2000 no-bake binder sold by Ashland Casting Solutions, a division of Ashland Inc. The resin was used at a at a 55 / 45 ratio of part I to part II and was catalyzed with 3% PEP SET Catalyst 3501. These samples were subsequently machined into cellular filters that contained a series of round holes and a 2″ diameter filtering area with a convex and concave shaped exit surface as shown in FIGS. 1 and 2 respectively.
[0053] Molten aluminum metal having a temperature of 760° C. was poured through the traditional pressed ceramic filter and the filters made from microspheres in open air (no downsprue was present) so the stream that exited the filter could be monitored. The test was videotaped and the videotape was reviewed after the test...
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