Fibers of the SiO2-ZrO2 system with 70/30 and 50/50 (wt%) compositions were prepared by the sol-gel method, using Si and Zr alkoxides as precursors. Green fibers were heated at different temperatures up to 1500°C. Chemical processes in solution and heating procedures provided a particular microstructure of the final material in which spherical particles of tetragonal zirconia were embedded in an amorphous matrix. The tensile strength of the fibers was determined as a function of cross-sectional area for samples treated at different temperatures with variable heating times. Fractographical analysis allowed determination of fracture toughness. Mechanical properties are discussed in terms of ZrO2 crystallization (tetragonal habit), fiber densification and microstructure. © 1993.
Sol-Gel Derived SiO2-ZrO2 Nanocomposite Fibers: Influence of Composition Thermal Treatment and Microstructure on Tensile Strength
Sglavo, Vincenzo Maria;Dal Maschio, Roberto;Sorarù, Gian Domenico;Carturan, Giovanni
1993-01-01
Abstract
Fibers of the SiO2-ZrO2 system with 70/30 and 50/50 (wt%) compositions were prepared by the sol-gel method, using Si and Zr alkoxides as precursors. Green fibers were heated at different temperatures up to 1500°C. Chemical processes in solution and heating procedures provided a particular microstructure of the final material in which spherical particles of tetragonal zirconia were embedded in an amorphous matrix. The tensile strength of the fibers was determined as a function of cross-sectional area for samples treated at different temperatures with variable heating times. Fractographical analysis allowed determination of fracture toughness. Mechanical properties are discussed in terms of ZrO2 crystallization (tetragonal habit), fiber densification and microstructure. © 1993.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione
