Institute of Solid State Chemistry and Mechanochemistry SB RAS, Novosibirsk 630128 Russian Federation

Natalya Baklanova, Anatoly Titov, Boris Zaitsev

It is widely accepted that the mechanical properties, the environmental stability and the failure mechanisms of fiber-reinforced matrix composites are strongly influenced by the interfacial fiber/matrix zone. Matrix composites reinforced by carbon or SiC-based fibers achieve high toughness and damage tolerance through the disposal of fiber coating which can deflect cracks and promote debonding at the fiber/matrix region.

 The special approaches for fabrication of thin (not more than 500 nm), uniform and oxidation resistance interfacial coatings on small diameter carbon and SiC filaments will be considered. These approaches include reactive chemical vapor deposition, sol-gel and deposition from organosilicon precursors. The refractory oxide and carbide coatings were obtained using these approaches. The evaluation of nanoscale properties of the interfacial coatings with different techniques such as high resolution scanning electron microscopy, energy dispersive analysis, X-Ray photoelectron spectroscopy, atomic force microscopy, and micro Raman spectroscopy will be considered. The morphology, composition, topography, roughness, adhesive forces, tensile strength properties of coated carbon and SiC fibers will be discussed in details. A special attention will be paid to quantitative characterization of the nanosized interfacial coatings on fibers. The peculiarities of the behavior of zirconia-based interphase with accurate phase control will be discussed in details. Criteria for further optimization of interphase will be formulated.

Baklanova Natalya is Senior Researcher of Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of Russian Academy of Sciences, Novosibirsk
PhD in Chemistry, Leader of Advanced Ceramic Materials Group.