S.T. Mileiko Current Opinion in Solid State and Materials Science 9(2005)219-229 Fig 4. Single crystalline YAG(a)and mullite fibres(b)obtained by using ICM 8000 吵∴! Coated 2zum∽gz 8。8 FIBRE LENGTH/ mm Fig. 5. Room temperature bending strength of sapphire fibres as extracted Temperature/12001400-1600 and coated with silicon carbide Fig. 7. The temperature dependence of the bending and tensile strength of sapphire and some eutectic fibres 5000 two cases of the oxide/ metal composites from the point of view of the interface strength. Results of the study of these two cases will be presented below, but we start with a brief outline of micromechanical creep models, which are neces- sary to interpret test results in an appropriate way 3.1. Creep models We consider composites with creeping matrix and ini- tially continuous fibres. A continuous fibre means that its length is much larger than a critical fibre length. Obviously, there can be observed at least four creep regimes of such composite [22]: Coating thickness/micron 1. E: fibres are elastic and non-breaking 2. Br-NCr: fibres are elastic and brittle thickness. Solid points stand for fibres of batch vo453 with pyrocarbon 3. Cr: fibres are creeping and non-breaking bating: open points are for fibres of batch vo86 with SiC-coating 4. Br-Cr: fibres are creeping and brittletwo cases of the oxide/metal composites from the point of view of the interface strength. Results of the study of these two cases will be presented below, but we start with a brief outline of micromechanical creep models, which are neces￾sary to interpret test results in an appropriate way. 3.1. Creep models We consider composites with creeping matrix and ini￾tially continuous fibres. A continuous fibre means that its length is much larger than a critical fibre length. Obviously, there can be observed at least four creep regimes of such composite [22]: 1. E: fibres are elastic and non-breaking. 2. Br–NCr: fibres are elastic and brittle. 3. Cr: fibres are creeping and non-breaking. 4. Br–Cr: fibres are creeping and brittle. Fig. 5. Room temperature bending strength of sapphire fibres as extracted and coated with silicon carbide. Fig. 6. Average sapphire fibre strength on a length of 1 mm versus coating thickness. Solid points stand for fibres of batch V0453 with pyrocarbon coating; open points are for fibres of batch V086 with SiC-coating. Fig. 7. The temperature dependence of the bending and tensile strength of sapphire and some eutectic fibres. Fig. 4. Single crystalline YAG (a) and mullite fibres (b) obtained by using ICM. S.T. Mileiko / Current Opinion in Solid State and Materials Science 9 (2005) 219–229 223