Gelcasting
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Gel casting is a direct foaming technique used to produce ceramic and polymeric scaffolds.
History
Gel casting was developed in Canada in the 1960s{{cite book |last1=Somiya |first1=Shigeyuki |title=Handbook of Advanced Ceramics {{!}} ScienceDirect |url=https://www.sciencedirect.com/book/9780123854698/handbook-of-advanced-ceramics |date=May 2013 |isbn=9780123854698 |access-date=10 January 2021 |language=en}} and ever since it became an interesting manufacturing forming process for near-net-shape, very large, high-quality, complex ceramic parts with specified threshold strength.{{cite journal |last1=Si |first1=W |last2=Graule |first2=TJ |last3=Baader |first3=FH |last4=Gauckler |first4=LJ |title=Direct coagulation casting of silicon carbide components |journal=Journal of the American Ceramic Society |date=1999 |volume=82 |issue=5 |pages=1129–1136 |doi=10.1111/j.1151-2916.1999.tb01886.x |access-date=}}
Process
In this technique, the precursor materials typically consist of a monomer, cross linker, free radical initiator or catalysts are placed into an aqueous suspension. Such precursor conforms to a slurry that is then foamed before it undergoes a direct consolidation step. In this step, the binder becomes polymerized to consolidate the particle structure within the precursor slurry. The process then forms a gel type of mixture, which is then cast into a proper mould. The next step, after the gel solidification, it is removed from the mould in a controlled manner and then being dried to form a green body. The outcome here has interesting mechanical properties and is capable of being machined at this step. Eventually, the binder is burnt out and the final scaffold sintering will take place.{{cite book |last1=Kajal |first1=Mallick |title=Bone Substitute Biomaterials {{!}} ScienceDirect |url=https://www.sciencedirect.com/book/9780857094971/bone-substitute-biomaterials |date=21 July 2014 |publisher=Elsevier Science |isbn=9780857094971 |access-date=10 January 2021 |language=en}}
See also
References
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Further reading
- A. Lottermoser, "Uber das Ausfrieren von Hydrosolen", Chemische Berichte, 41, 1908, 532–540
Category:Casting (manufacturing)
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