Composite Oxide Fibres Grown by Internal Crystallisation Method

Abstract

Abstract:The internal crystallisation method (ICM) allows producing bundles containing hundreds and thousands of the fibres of a limited length. It is shown in the present paper that ICM can be used to produce fibres composed of a sapphire matrix and inclusions of calcium hexaaluminate. The fabrication of such composite fibres is described in the present paper. An effect of the calcium hexaaluminate inclusions in sapphire fibres is evaluated by testing model composites with brittle molybdenum matrices. The critical stress intensity factors of composite-fibre/molybdenum-matrix specimens are higher than those of specimens reinforced with sapphire fibres. The model specimens reveal non-linear stress/strain behaviour. The results of this work show the effectiveness of composite fibres as a reinforcement for brittle matrices.

YAP-Based Fibers Obtained by Internal Crystallization Method

“…Hence, the method is a base for developing a fabrication technology of a very high productivity rate, which makes ICM-fibers with a characteristic cross-section size of tens of microns in diameter, suitable for structural applications. A number of single crystalline oxide fibers, including those of mullite [9][10][11] and yttrium-aluminum garnet [12], which are the most creep-resistant oxides, as well as a number of composite fibers (see e.g., [13][14][15]), have been obtained and studied since then. However, because the need in various reinforcements for heat-resistant fibers still remains, the list of oxide fibers studied cannot be considered completed.…”