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Colloidal processing of Al2O3-based composites reinforced with TiN and TiC particulates, whiskers and nanoparticles
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
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2001 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 21, 1027-1035 p.Article in journal (Refereed)
Abstract [en]

A colloidal processing route has been developed for the preparation of dense and homogeneous Al2O3¯TiN/TiC composites. The dispersion and rheological properties of mixtures of TiN or TiC particulates and Al2O3 particles were investigated using electrokinetics and steady-shear rheology. We found that well-dispersed aqueous suspensions with low viscosity could be prepared by adding a poly(acrylic acid) dispersant and controlling pH in the alkaline range. This processing scheme was also suitable for preparation of whisker and nanoparticle composite suspensions. The alumina-based composite suspensions with a secondary-phase concentration of 25 vol.% were freeze-granulated and hot-pressed, and the resulting bodies were fully densified with well-dispersed secondary phases. Homogeneous Al2O3¯TiN nanoparticle composites could only be prepared with additions of up to 5 vol.% nanoparticles; higher additions resulted in agglomeration and subsequent grain growth of the nanoparticles.

Place, publisher, year, edition, pages
2001. Vol. 21, 1027-1035 p.
Keyword [en]
Al2O3–TiC, Al2O3–TiN, Composites, Microstructure-final, Suspensions, TiC, TiN
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26881OAI: oai:DiVA.org:ri-26881DiVA: diva2:1053884
Note
A1444Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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