Continuous Fibre Reinforced Glass and Glass-Ceramic Matrix Composites

Carbon nanotube/boehmite-derived alumina ceramics obtained by hydrothermal synthesis and spark plasma sintering (SPS)

“…[6][7][8][9][10][11] The reinforcements can be made of ceramics or metals 6 but ceramics are ideal as metal fiber reinforcements show relatively low thermal capability and poor chemical resistance which limits the application temperature and environment. 12 Besides, generally greater toughness, strength and hardness values are achieved in fine grained materials therefore CNTs were proved to be suitable grain refiners. 13 In conclusion, CNTs can be considered to be suitable reinforcements to increase the mechanical properties as well as the electrical conductivity of alumina.…”

Examination of microhardness indentation‐induced subsurface damage in alumina platelet reinforced borosilicate glass using confocal scanning laser microscopy

“…In addition, no trace of cristobalite or of any other crystalline phase was found in the borosilicate glass matrix. The existence of a strong bonding between the phases is also confirmed by the mechanical properties of the composites, which were investigated in previous studies using a range of techniques, including four-point bend tests, the single-edgenotched-beam (SENB) technique and Vickers indentation (Boccaccini et al, 1995;Boccaccini & Trusty, 1996). A summary of these results is presented in Table 1, which contains the data for the Young's modulus, fracture strength, fracture toughness and hardness of the fabricated composites.…”

“…The presence of this residual compressive stress, coupled with the fact that there are well-defined, strongly bonded matrix/platelet interfaces (see Fig. 2), is suggested to be the main reason for the toughening and strengthening in these composites (Boccaccini et al, 1995;Boccaccini & Trusty, 1996). Although this compressive stress in the matrix has not yet been measured, it is suggested here that it may be responsible for the limited lateral cracking and the reduction of the mean depth of subsurface cracks found in the composites, compared with the unreinforced glass matrix.…”

“…fracture toughness and strength, of dispersion reinforced glass and glass ceramic composites may not be as pronounced as that achieved using continuous fibre reinforcement (Hegeler & Bruckner, 1989;Rawlings, 1994), the use of less expensive powder technology preparation techniques makes dispersion reinforcement an attractive alternative (Rawlings, 1994;Boccaccini et al, 1995). In addition, in several ceramic systems, wear and abrasion resistance have been shown to be improved significantly with the addition of a hard dispersed particulate or whisker phase (Alman et al, 1995).…”

“…To date, there has been limited work on the use of platelets as a reinforcing constituent in glass and glass ceramics, and only SiC platelets have been investigated in these matrices (Hyde et al, 1993;Verma et al, 1995). In recent studies the incorporation of alumina platelets in a commercial borosilicate glass has been investigated and the mechanical behaviour of the resultant composite was evaluated in terms of fracture strength, Young's modulus, hardness and fracture toughness (Boccaccini et al, 1995;Boccaccini & Trusty, 1996). It was found that the mechanical properties increase with platelet addition, mainly as a result of an increase in the Young's modulus of the composite over the unreinforced glass, the introduction of residual stresses in the matrix owing to the thermal expansion mismatch between the phases and also crack deflection processes occurring around the platelets.…”