Significance of hot pressing parameters and reinforcement size on densification behavior of ZrB2–25vol% SiC UHTCs

ZrB2–25vol% SiC ceramic composites were prepared by hot pressing in order to investigate the effects of processing parameters and SiC particle size (20nm, 200nm and 5µm) on the densification behavior. At this study, an experimental design technique (Taguchi method) was used to specify the significan...

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Bibliographic Details
Published in:Ceramics international 2015-06, Vol.41 (5), p.6439-6447
Main Authors: Jaberi Zamharir, Mehran, Shahedi Asl, Mehdi, Pourmohammadie Vafa, Nasser, Ghassemi Kakroudi, Mahdi
Format: Article
Language:English
Subjects:
A. Hot pressing
Densification
Taguchi method
ZrB2–SiC composite
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Summary:ZrB2–25vol% SiC ceramic composites were prepared by hot pressing in order to investigate the effects of processing parameters and SiC particle size (20nm, 200nm and 5µm) on the densification behavior. At this study, an experimental design technique (Taguchi method) was used to specify the significance of four factors and to obtain the optimal conditions. The statistical analysis distinguished the applied pressure as the most effective parameter on the relative density of ZrB2–SiC composites. A relative density of ~100% was obtained at the optimal processing conditions: temperature of 1850°C, holding time of 90min, pressure of 16MPa and SiC particle size of 200nm. The confirmation test, performed under optimum conditions, indicated that the experimental outcomes were equal with the expected values from the Taguchi prediction. The mechanisms of enhanced densification of hot pressed ZrB2–SiC ceramic composites were discussed.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2015.01.082