Evaluation of SiC/SiC minicomposites with yttrium disilicate fiber coating. Issue 1 (11th September 2017)

• Record Type: Journal Article
• Authors: Boakye, Emmanuel E.; Key, Thomas S.; Parthasarathy, Triplicane A.; Keller, Kristin A.; Opeka, Samuel J.; Hay, Randall S.; Cinibulk, Michael K.
• Is Part Of: Journal of the American Ceramic Society. Volume 101:Issue 1(2018)
• Page Start: 91
• Page End: 102
• Publication Date: 2017-09-11
• Subjects: ceramic matrix composites -- RE2Si2O7 oxide coating -- SiC fiber -- weak interface; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.15170
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Hi‐Nicalon‐S/α‐Y2 Si2 O7 /SiC minicomposites were formed by polymer infiltration pyrolysis (PIP) and characterized by TEM, SEM fractography, tensile testing, and fiber push‐in testing. All minicomposites with α‐Y2 Si2 O7 fiber coatings had strengths significantly higher than the control samples without fiber coatings. Extensive fiber pullout with debonding at the coating‐fiber interface or within the coating itself was observed in minicomposites with Y2 Si2 O7 fiber coatings, but no debonding was observed in minicomposites without fiber coatings. Debond energies of 4.5 ± 3, 4.6 ± 3 J/m 2 and average sliding stresses of 91 ± 40, 94 ± 40 MPa were measured by fiber push‐in tests.