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Dense Al 2 O 3 /ZrO 2 Particulate Composites by Free Sintering of Coated Powders
Author(s) -
Hu ChingLi,
Rahaman Mohamed N.
Publication year - 1994
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.1151-2916.1994.tb05370.x
Subject(s) - sintering , materials science , composite material , composite number , fabrication , particulates , ceramic , volume fraction , coating , medicine , ecology , alternative medicine , pathology , biology
Composite powders, prepared by coating coarse ZrO 2 particles with fine Al 2 O 3 powder using a chemical precipitation technique, were compacted and sintered freely at a constant heating rate of 4°C/min to ∼1600°C. Composites containing up to ∼30 vol% inclusions were sintered to nearly full density under the same conditions used for the unreinforced matrix. Furthermore, the sintering kinetics were not influenced significantly by the inclusion volume fraction. The sinterability of the composites formed from the coated powders was significantly better than that for similar composites formed from mechanically mixed powders. The present data provide a further demonstration that the use of coated powders may have widespread applicability for the fabrication, by free sintering, of dense ceramic particulate composites.