Processing and Testing of RE2Si2O7 Fiber–Matrix Interphases for SiC–SiC Composites. Issue 2 (17th October 2015)

• Record Type: Journal Article
• Authors: Boakye, Emmanuel E.; Mogilevsky, Pavel; Parthasarathy, Triplicane A.; Keller, Kristin A.; Hay, Randall S.; Cinibulk, Michael K.
• Is Part Of: Journal of the American Ceramic Society. Volume 99:Issue 2(2016)
• Page Start: 415
• Page End: 423
• Publication Date: 2015-10-17
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13935
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract : Rare‐earth disilicates (RE2 Si2 O7 ) are investigated for use as oxidation‐resistant alternatives to carbon or BN fiber–matrix interphases in ceramic matrix composites (CMC). Dense α, β, γ‐Y2 Si2 O7, and γ‐Ho2 Si2 O7 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 α‐, β‐, and γ‐RE2 Si2 O7 matrices were measured by fiber push‐out. Deformation of RE2 Si2 O7 after indentation and after fiber push‐out was characterized by TEM. Implications of the results for use of RE2 Si2 O7 as a fiber–matrix interphase in CMCs are discussed.