Colloidal processing of Al2O3-based composites reinforced with TiN and TiC particulates, whiskers and nanoparticles
2001 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, Vol. 21, no 8, 1027-1035 p.Article in journal (Refereed) Published
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, no 8, 1027-1035 p.
Chemical Sciences Physical Chemistry Inorganic Chemistry
IdentifiersURN: urn:nbn:se:su:diva-22786DOI: 10.1016/S0955-2219(00)00302-2OAI: oai:DiVA.org:su-22786DiVA: diva2:189459
Part of urn:nbn:se:su:diva-1132004-04-202004-04-202010-11-19Bibliographically approved