Effects of SiC whiskers on the mechanical properties and microstructure of SiC ceramics by reactive sintering

As-received and pre-coated SiC whiskers (SiCw)/SiC ceramics were prepared by phenolic resin molding and reaction sintering at 1650°C. The influence of SiCw on the mechanical behaviors and morphology of the toughened reaction-bonded silicon carbide (RBSC) ceramics was evaluated. The fracture toughnes...

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Bibliographic Details
Published in:Ceramics international 2017-06, Vol.43 (9), p.6786-6790
Main Authors: Song, Ning, Zhang, Hai-bin, Liu, Hong, Fang, Jing-zhon
Format: Article
Language:English
Subjects:
Coating
Mechanical properties
Reactive sintering
SiC whiskers
Silicon carbide
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Summary:As-received and pre-coated SiC whiskers (SiCw)/SiC ceramics were prepared by phenolic resin molding and reaction sintering at 1650°C. The influence of SiCw on the mechanical behaviors and morphology of the toughened reaction-bonded silicon carbide (RBSC) ceramics was evaluated. The fracture toughness of the composites reinforced with pre-coated SiCw reached a peak value of 5.6MPam1/2 at 15wt% whiskers, which is higher than that of the RBSC with as-received SiCw (fracture toughness of 3.4MPam1/2). The surface of the whiskers was pre-coated with phenolic resin, which could form a SiC coating in situ after carbonization and reactive infiltration sintering. The coating not only protected the SiC whiskers from degradation but also provided moderate interfacial bonding, which is beneficial for whisker pull-out, whisker bridging and crack deflection.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2017.02.095