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Characterization of Novel Gel-Casting System to Make Complex-Shaped Aluminum Oxide (Al₂O₃) Parts

Report No.	ARL-TR-7620
Authors:	Carli A Moorehead; Victoria L Blair; Jane W Adams
Date/Pages:	March 2016; 26 pages
Abstract:	This work describes the characterization of a novel gel-casting system using a water-soluble co-polymer of isobutylene and maleic anhydride (trade name ISOBAM). This system enables ceramic slurries to gel at very low binder concentrations (0.3–0.5 wt%), producing a dense, near-net-shaped green body with high solids loading, low organic content, low shrinkage, and moderate strength. The effect of both binder content and solids loading on gel time and mechanical strength of green bodies is investigated along with typical shrinkage and densification rates of both green and sintered parts. Additionally, the effect of primary particle size and surface area on slurry and gelling behavior is explored to determine if a relationship exists that can help predict appropriate slurry formula parameters.
Distribution:	Approved for public release
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Last Update / Reviewed: March 1, 2016