Microstructure-property relationships of SiC fiber-reinforced magnesium aluminosilicates. 1: Microstructural characterization
- Univ. of Cambridge (United Kingdom). Dept. of Materials Science and Metallurgy
The microstructure of two magnesium aluminosilicates unidirectionally reinforced with SiC fibers (Nicalon) has been examined. A diphasic interlayer having a higher O/Si ratio than in the fibers was found on the surface of the fibers in both composites. This interlayer could be identified as an amorphous mixture of silica and carbon in the composite hot-pressed just below the liquidus temperature of stoichiometric cordierite (composite A). In the other composite hot-pressed at 920 C and subsequently ceramed at 1,150 C (composite B), a relatively thicker diphasic interlayer was observed, consisting of turbostratic carbon together with amorphous silica. A distinct interlayer of turbostratic carbon was identified in composite A. A thin interlayer consisting mostly of matrix elements was also identified between the diphasic interlayer and the discrete carbon interlayer in this composite. Differences in the structure and morphology of interfacial regions in the two composites could clearly be attributed to differences in the hot-pressing schedules. The basal planes of turbostratic carbon were aligned parallel to the fiber-matrix interfaces in both composites.
- OSTI ID:
- 264108
- Journal Information:
- Acta Materialia, Vol. 44, Issue 7; Other Information: PBD: Jul 1996
- Country of Publication:
- United States
- Language:
- English
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