Oxide Fiber Coatings for Silicon Carbide Ceramic Matrix Composites

Boakye, Emmanuel E.; Mogilevsky, P.; Parthasarathy, Triplicane A.; Hay, Randall S.; Cinibulk, Michael K.; Ahrens, M.

doi:10.1002/9781118095355.ch1

Cited by 1 publication

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“…This work shows that the mechanical properties of several polymorphs of RE 2 Si 2 O 7 (Re = Y, and Ho) are comparable to LaPO 4 (monazite). The Vickers hardness values of α‐, and β‐Y 2 Si 2 O 7 polymorphs, ~6.4 GPa, were close to previously reported for γ‐Y 2 Si 2 O 7 and similar to LaPO 4 monazite (~5.6 GPa). Fiber push‐out studies of SCS‐0 fibers in α‐, β‐, and γ‐Y 2 Si 2 O 7 and γ‐Ho 2 Si 2 O 7 matrices measured average sliding stresses of 20–30 MPa, which is lower than the values reported for LaPO 4 but higher than most values reported for C and BN fiber–matrix interphases …”

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confidence: 87%

Processing and Testing of RE₂Si₂O₇ Fiber–Matrix Interphases for SiC–SiC Composites

et al. 2015

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Rare-earth disilicates (RE 2 Si 2 O 7 ) are investigated for use as oxidation-resistant alternatives to carbon or BN fiber-matrix interphases in ceramic matrix composites (CMC). Dense a, b, c-Y 2 Si 2 O 7 , and c-Ho 2 Si 2 O 7 pellets were formed at 64 MPa and 1050°C-1200°C for 1 h using the field-assisted sintering technique (FAST). Pellet modulus was measured using nanoindentation, and Vickers hardness was measured at loads of 100, 500, and 1000 g. The sliding stress of SCS-0 SiC fibers incorporated in a-, b-, and c-RE 2 Si 2 O 7 matrices were measured by fiber push-out. Deformation of RE 2 Si 2 O 7 after indentation and after fiber push-out was characterized by TEM. Implications of the results for use of RE 2 Si 2 O 7 as a fiber-matrix interphase in CMCs are discussed.

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Section: Resultssupporting

confidence: 87%

Processing and Testing of RE₂Si₂O₇ Fiber–Matrix Interphases for SiC–SiC Composites

et al. 2015

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Oxide Fiber Coatings for Silicon Carbide Ceramic Matrix Composites

Cited by 1 publication

References 34 publications

Processing and Testing of RE₂Si₂O₇ Fiber–Matrix Interphases for SiC–SiC Composites

Processing and Testing of RE₂Si₂O₇ Fiber–Matrix Interphases for SiC–SiC Composites

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Oxide Fiber Coatings for Silicon Carbide Ceramic Matrix Composites

Cited by 1 publication

References 34 publications

Processing and Testing of RE2Si2O7 Fiber–Matrix Interphases for SiC–SiC Composites

Processing and Testing of RE2Si2O7 Fiber–Matrix Interphases for SiC–SiC Composites

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Processing and Testing of RE₂Si₂O₇ Fiber–Matrix Interphases for SiC–SiC Composites

Processing and Testing of RE₂Si₂O₇ Fiber–Matrix Interphases for SiC–SiC Composites