Interfacial phenomenology of SiC fibre reinforced Li2O Al2O3 6SiO2 glass-ceramic composites

The microstructures of SiC fiber-reinforced Li2O-Al2O3-6SiO2 glass-ceramic composites with Ta2O5, Nb2O5, TiO2, and ZrO2 dopants were investigated. An amorphous carbon-rich layer, from 100 to 170 nm thick, was observed in the interfacial region between fiber and matrix. A second interfacial layer of...

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Bibliographic Details
Published in:Journal of materials science 1992-01, Vol.27 (2), p.374-380
Main Authors: Hsu, Jen -Yan, Speyer, R. F.
Format: Article
Language:English
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Summary:The microstructures of SiC fiber-reinforced Li2O-Al2O3-6SiO2 glass-ceramic composites with Ta2O5, Nb2O5, TiO2, and ZrO2 dopants were investigated. An amorphous carbon-rich layer, from 100 to 170 nm thick, was observed in the interfacial region between fiber and matrix. A second interfacial layer of TaC, NbC, TiC precipitates, appeared adjacent to the C-rich layer. Low bond strength between these two interfacial layers resulted in low interfacial shear strength, and this in turn led to an increase in toughness of the composites containing 4 mol pct Ta2O5 or Nb2O5 dopant. Two mol pct Ta2O5 dopant in this composite acted as a nucleating agent for the matrix but was not adequate to form an appreciable volume of TaC particles in the interfacial region, hence a flexural strength decrease was observed. The composite containing TiO2 dopant exhibited low flexural strength and fracture toughness resulting from the formation of a TiC layer which had a larger coherent bond strength with the interfacial C-rich layer, and attacked the structural integrity of the fibers. (Author)
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00543926