Role of Particle Substructure in the Sintering of Monosized Titania | Zendy

EDELSON LAWRENCE H. | Zendy; GLAESER ANDREAS M. | Zendy

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Role of Particle Substructure in the Sintering of Monosized Titania

Author(s) -

EDELSON LAWRENCE H.,

GLAESER ANDREAS M.

Publication year - 1988

Publication title -

journal of the american ceramic society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.9

H-Index - 196

eISSN - 1551-2916

pISSN - 0002-7820

DOI - 10.1111/j.1151-2916.1988.tb05852.x

Subject(s) - agglomerate , anatase , sintering , materials science , shrinkage , microstructure , crystallization , chemical engineering , rutile , crystallite , particle (ecology) , nucleation , substructure , composite material , porosity , metallurgy , mineralogy , chemistry , oceanography , organic chemistry , structural engineering , photocatalysis , engineering , geology , catalysis , biochemistry

Monosized titania particles (∼0.35‐μ diameter) prepared by controlled hydrolysis of titanium tetraethoxide in ethanol were found to be porous agglomerates of ∼6‐nm primary particles. The sintering behavior of compacts constituted of monodispersed agglomerates was evaluated, and changes in macroscopic dimensions were correlated with changes in particle microstructure and chemistry. The total volume shrinkage during sintering was ≥87%. Five contributions to the total shrinkage and the temperature ranges for the associated processes were identified: removal of chemisorbed water (from ambient to 250°C), crystallization to anatase (between 250° to 425°C), intra‐agglomerate densification (425° to 800°C), conversion of anatase to rutile (600° to 800°C), and inter‐agglomerate densification (>800°C). Approximately one‐half the compact shrinkage was the result of agglomerate substructure changes. Studies of the agglomerate structural evolution indicated the intra‐agglomerate densification and crystallite growth rates are the secondary factors, after compact packing, that influenced microstructure development.

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