アルミナの反応焼結(RBAO) : 科学と技術

概要

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A new technology to fabricate low-to-zero shrinkage Al_2O_3-based composites, Reaction Bonding of Aluminum Oxide (RBAO), is presented : Al and Al_2O_3 precursor powder mixtures are intensively milled, compacted, and heat-treated in air, such theat Al fully oxidizes to Al_2O_3. The volume expansion associated with the oxidation partially compensates for the sintering shrinkage. The process can be modified by incorporating other metals or ceramic phases to change the final composition, to enhance the mechanical properites, and to further compensate for the sintering shrinkage. Interesting characteristics of this technology are easy green machining without binders, superior mechanical properties of reaction-bonded bodies without final machining (also when green machined), superplastic formability, near-net-shape capability, and broad microstructural and compositional versatility.
社団法人日本セラミックス協会の論文
1995-08-01