Mechanical properties of oxide-fiber reinforced glass matrix composites with BN or SnO2 interfaces

Understanding the mechanical reinforcement of uniformly dispersed multiwalled carbon nanotubes in alumino-borosilicate glass ceramic

“…A survey of the literature reveals that improving the flexural strength to such an extent was not possible in earlier research efforts concerned with reinforcement of borosilicate glass with CNTs [15]. Furthermore, in more conventional fibre-reinforced or ceramic platelet-reinforced borosilicate glass matrix composites, improvements of only a maximum of $60% in strength could be achieved with 5-12 vol.% Nextel TM fibres [33] and $20% with Al 2 O 3 platelets [34], as opposed to a nearly 100% improvement for the present ABS-10 wt.% MWCNT nanocomposites. In fact, with respect to both the flexural strength and the fracture toughness, the present results show the biggest improvements reported in the literature pertain to CNT-reinforced inorganic glassy matrices [15,16] in cases where it is clear that the improvements are due directly to the CNTs and not to indirect effects on the microstructure.…”

Development and Characterization of Transparent Glass Matrix Composites

“…However, the strong interface bonding between the oxide fibre and the glass matrix reduces the composite strength and toughness, compared with SiC fibre-reinforced composites [6,18,19,31]. Obviously, the introduction of weak interface bonding is a key aspect to confer improved toughness on the composite.…”

“…Nevertheless, methods to deposit SnO 2 layers require high temperatures, which can cause property degradation of some fibres. It has also been found that Sn-ions may diffuse into the glass matrix during hot pressing, which will lead to strongly-bonded fibres and to impaired fibre pull-out and limited crack-deflection mechanisms [31].…”

“…BN coatings can improve the fibre/matrix interface bonding leading to fibre pull-out and enhanced flexural strength and fracture toughness of the composites[59]. Thus, BN layers have been used to coat Nextel TM 440 fibres and SiC fibres via CVD/CVI deposition[23,31,[93][94][95]. In addition to enhancing the fracture behaviour and fracture strength of composites, BN coatings also protect the fibres during processing[93].…”

Optically-transparent oxide fibre-reinforced glass matrix composites

“…They are therefore candidates for production of tough glass matrix composites (GMC) [7]. Alumina fibres have been investigated previously as reinforcement in silicate matrix composites, and control of the interface was shown to be critical to improving fracture toughness [2,[6][7][8][9][10][11][12][13][14][15][16]. Dericioglu and Kagawa have demonstrated enhanced fracture toughness on incorporation of a ZrO 2 interface in a glass matrix/alumina fibre composite, due to the absence of strong chemical bonding between the ZrO 2 layer and the alumina fibres.…”