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Preparation and Properties of Borosilicate‐Coated Alumina Particles from Alkoxides
Author(s) -
Harmer Mark A.,
Bergna Horacio,
Saltzberg Michael,
Hu Yu H.
Publication year - 1996
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.1151-2916.1996.tb08763.x
Subject(s) - borosilicate glass , materials science , agglomerate , coating , nucleation , chemical engineering , particle (ecology) , oxide , composite material , composite number , particle size , mineralogy , metallurgy , chemistry , oceanography , organic chemistry , engineering , geology
This paper describes the synthesis of borosilicate‐coated alumina particles. Coated particles are agglomerate‐free and contain up to 50 vol% coating. The ability to form uniform coatings is highly dependent upon both the solution chemistry and the control of the nucleation and growth of the borosilicate on the alumina. The coated particles show markedly improved densification compared to that of a mechanical mixture of borosilicate and alumina. These composite powders (borosilicate‐coated alumina particles) are moisture‐sensitive, resulting in a leached, phase‐separated, boric oxide. The particles can be stabilized by further encasing the particle with a thin layer of silica.