Borosilicate glass matrix composites

FIGURE 2. TEM micrograph showing the interfacial zone in a SiC-Nicalon fibre-reinforced borosilicate glass matrix composite. The carbonaceous interface is clearly observed. (Micrograph reproduced with permission from Ref. [6]). 

FIGURE 6. A typical microstructure of a borosilicate glass matrix composite reinforced with unidirectional SiC-Nicalon fibres (40 vol%) fabricated by hot-pressing (Schott Glas, Mainz, Germany). The micro structure is characterised by the absence of porosity and a fairly homogenous distribution of the fibres [6]. 

FIGURE 10. A typical fracture surface of a borosilicate glass matrix composite reinforced by Nicalon fibres... 

FIGURE 4. Typical microstructures of hot-pressed borosilicate glass matrix composites containing a) alumina platelet, b) chopped stainless steel fibres and c) molybdenum particles as reinforcement [16,17,55]. 

FIGURE 6. The dependence of the mechanical properties of alumina platelet reinforced borosilicate glass matrix composites on the platelet volume fraction (a) Young s modulus, (b) fracture strength and (c) fracture toughness... 

The variation of the elastic modulus, fracture strength and fracture toughness of a model alumina platelet-reinforced borosilicate glass matrix composite with the volume fraction of platelets is shown in Figure 6 [17,128]. The material exhibited a pore-free matrix, uniform distribution of the platelets and strong matrix/platelet interfacial bonding. In Figure 6 both... 

Borosilicate glass matrix composites with chopped graphite fibres are highly machine-able materials [29]. Machinable glass-ceramics containing interlocking platelet-like and... 

A. R. Boccaccini, G. Ondracek and C. Syhre, Borosilicate Glass Matrix Composites Reinforced with Short Metal Fibres, Glastech. Ber. Glass Sci. Technol. 67, 16 0 (1994). 

A. R. Boccaccini, D. B. Acevedo, G. Brusatin, and P. Colombo, Borosilicate glass matrix composites containing multi-wall carbon nanotubes, J. Europ. Ceram. Soc. (2004) in press. 

Kaya C, Boccaccini AR, Chawla KK, Electrophoretic deposition forming of Ni-coated carbon fibre reinforced borosilicate glass matrix composites, J Am Ceramic Soc, 83, 1885, 2000. 

The interface between HM carbon fiber and a Pyrex borosilicate glass matrix was Analyzed by Bleay and Scott [111,112] and found to be some 100 nm thick and believed to comprise Na enriched silicon oxycarbide, showing that some reaction had taken place during fabrication. Measurement of the interlaminar shear strength of the composite indicated that this layer was not a source of weakness. Substantial fiber pull-out had occurred, however, exposing clean fiber surfaces and smooth sockets. It was concluded that the interfacial shear process was confined to the outer layer of the fiber. Heat treatment of the composite in air caused preferential oxidation of the fiber, the rate being higher parallel to the fiber axis than perpendicular to it. 

Crosbie GM, Nicholson JM, Deering LA, Pseudo 3-D reinforcement with stretch-broken carbon fibers in a borosilicate glass matrix, JP Singh, Bansal NP eds.. Advances in Ceramic-Matrix Composites II, Ceram Trans, American Ceramic Soc Inc, Indianapolis, 46, 211-222, Apr 25-27 1994. 

Cross-section of 65 vol% SiC monofilament-reinforced 7740 borosilicate glass composite (reproduced by permission of Matrix Composite Mat. Sci.)66. 

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