Microstructure and role of outermost coating for tensile strength of SiC fiber

S. Q. Guo, Y. Kagawa, Y. Tanaka, C. Masuda

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

The detailed microstructure of the SiC fiber surface and the outermost coating of SiC(SCS-6) fiber are observed using transmission electron microscopy (TEM) and high resolution electron microscopy (HREM). The tensile strengths of the SiC fibers: uncoated fiber (SCS-0), coated fiber (SCS-6) and extracted fiber from fatigue-loaded SiC(SCS-6) fiber-reinforced Ti-15-3 composite are determined. Fractographic analysis is done on these fibers and the mirror radius is compared with the tensile strength. Thickness of the outermost coating is ≈3.6 μm and it consists of three different layers (i.e. sublayers I, II and III). Basically, these sublayers consist of a carbon matrix in which β-SiC crystallites are dispersed. The fracture toughness of the SiC fiber is ≈3.3 MPa m1/2. The outermost coating increases the fiber strength twofold because it reduces stress concentration at the surface of the SiC fiber. The tensile strength of the extracted fiber (SCS-6) from fatigue-loaded specimens shows a reduced strength which is attributed to the debonding of the outermost coating while the composite is loaded.

Original languageEnglish
Pages (from-to)4941-4954
Number of pages14
JournalActa Materialia
Volume46
Issue number14
Publication statusPublished - 1998 Sep 1
Externally publishedYes

Fingerprint

Tensile strength
Coatings
Microstructure
Fibers
Fatigue of materials
High resolution electron microscopy
Debonding
Composite materials
Crystallites
Stress concentration
Fracture toughness
Mirrors
Carbon
Transmission electron microscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys

Cite this

Guo, S. Q., Kagawa, Y., Tanaka, Y., & Masuda, C. (1998). Microstructure and role of outermost coating for tensile strength of SiC fiber. Acta Materialia, 46(14), 4941-4954.

Microstructure and role of outermost coating for tensile strength of SiC fiber. / Guo, S. Q.; Kagawa, Y.; Tanaka, Y.; Masuda, C.

In: Acta Materialia, Vol. 46, No. 14, 01.09.1998, p. 4941-4954.

Research output: Contribution to journalArticle

Guo, SQ, Kagawa, Y, Tanaka, Y & Masuda, C 1998, 'Microstructure and role of outermost coating for tensile strength of SiC fiber', Acta Materialia, vol. 46, no. 14, pp. 4941-4954.
Guo SQ, Kagawa Y, Tanaka Y, Masuda C. Microstructure and role of outermost coating for tensile strength of SiC fiber. Acta Materialia. 1998 Sep 1;46(14):4941-4954.
Guo, S. Q. ; Kagawa, Y. ; Tanaka, Y. ; Masuda, C. / Microstructure and role of outermost coating for tensile strength of SiC fiber. In: Acta Materialia. 1998 ; Vol. 46, No. 14. pp. 4941-4954.
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