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- Freeze_Gelation abstract "Freeze-gelation, is a form of sol-gel processing of ceramics that enables a ceramic object to be fabricated in complex shapes, without the need for high-temperature sintering. The process is similar to freeze-casting.The process is simple, but the science is, as of 2005, not well understood. The most common process involves the mixing of a silica solution with a filler powder. For example, if we were making a component out of alumina, aluminium oxide, then we would still use a silica sol, but alumina filler powder. The relative amounts used differ, normally between 3 and 4 times more filler than sol is added by weight.A wetting agent is added, such that the filler powder disperses properly in the sol, which is mostly water. This makes the mixture doughy and stiff. The mixture is, however, highly thixotropic, so that when vibrated it turns liquid. The stiff dough is placed in a mold and the mold vibrated to liquefy the mixture, filling the mold and releasing any trapped air.The filled mold is then frozen. On freezing, silica precipitates from the sol, forming a gel. This gel holds the filler powder together in something approximating a sintering greenform. The component is then dried in a furnace, leaving the component.The advantages of freeze-geleation over sintering are essentially cost-based. It doesn't require high pressure equipment or powerful furnaces (drying temperatures are only just above water's boiling point), yet it creates a useful product which takes the shape of the mold very accurately.".
- Freeze_Gelation wikiPageID "2575781".
- Freeze_Gelation wikiPageLength "6934".
- Freeze_Gelation wikiPageOutDegree "24".
- Freeze_Gelation wikiPageRevisionID "700364507".
- Freeze_Gelation wikiPageWikiLink Aluminium_oxide.
- Freeze_Gelation wikiPageWikiLink Capillary_action.
- Freeze_Gelation wikiPageWikiLink Casting.
- Freeze_Gelation wikiPageWikiLink Category:Casting_(manufacturing).
- Freeze_Gelation wikiPageWikiLink Ceramic.
- Freeze_Gelation wikiPageWikiLink Freeze-casting.
- Freeze_Gelation wikiPageWikiLink Gel.
- Freeze_Gelation wikiPageWikiLink Germans.
- Freeze_Gelation wikiPageWikiLink Investment_casting.
- Freeze_Gelation wikiPageWikiLink Laminar_opaline_silica.
- Freeze_Gelation wikiPageWikiLink Machining.
- Freeze_Gelation wikiPageWikiLink Monolith.
- Freeze_Gelation wikiPageWikiLink Porosity.
- Freeze_Gelation wikiPageWikiLink Powder_metallurgy.
- Freeze_Gelation wikiPageWikiLink Refractory.
- Freeze_Gelation wikiPageWikiLink Silicon_dioxide.
- Freeze_Gelation wikiPageWikiLink Sintering.
- Freeze_Gelation wikiPageWikiLink Sol-gel.
- Freeze_Gelation wikiPageWikiLink Solution.
- Freeze_Gelation wikiPageWikiLink Thermal_conductivity.
- Freeze_Gelation wikiPageWikiLink Thixotropy.
- Freeze_Gelation wikiPageWikiLink United_Kingdom.
- Freeze_Gelation wikiPageWikiLink University_of_Bath.
- Freeze_Gelation wikiPageWikiLinkText "Freeze Gelation".
- Freeze_Gelation wikiPageUsesTemplate Template:No_footnotes.
- Freeze_Gelation wikiPageUsesTemplate Template:Orphan.
- Freeze_Gelation subject Category:Casting_(manufacturing).
- Freeze_Gelation hypernym Form.
- Freeze_Gelation type Redirect.
- Freeze_Gelation comment "Freeze-gelation, is a form of sol-gel processing of ceramics that enables a ceramic object to be fabricated in complex shapes, without the need for high-temperature sintering. The process is similar to freeze-casting.The process is simple, but the science is, as of 2005, not well understood. The most common process involves the mixing of a silica solution with a filler powder.".
- Freeze_Gelation label "Freeze Gelation".
- Freeze_Gelation sameAs Q5501289.
- Freeze_Gelation sameAs m.07p38n.
- Freeze_Gelation sameAs Q5501289.
- Freeze_Gelation wasDerivedFrom Freeze_Gelation?oldid=700364507.
- Freeze_Gelation isPrimaryTopicOf Freeze_Gelation.