Oxide fibres in a nickel-base matrix—do they degrade or become stronger?

Abstract

The fibre/matrix interface in fibrous composites with brittle fibres can play a synergetic role in developing creep resistance of the composites. Increasing the interface strength, which is accompanied with a better fibre/matrix contact, results firstly in a decrease in the fibre critical length, which enhances the fibre strength as a result of the scale effect, and secondly in an increase in the characteristic fibre strength as a result of the healing of defects on the fibre surface. Such behaviour of the fibres is the most important argument in favour of producing heat-resistant metal matrix composites with high interface strength. An additional argument is the stability of such an interface under variable loading. It is shown that oxide fibres in Ni-base matrices can be sufficiently strong to provide Ni-base composites with high creep resistance up to a temperature of at least 1150 C.

YAP-Based Fibers Obtained by Internal Crystallization Method

“…Actually, this procedure gave the effective strength of the fiber in the matrix [17]. To calculate the fiber strength according to the rule of mixture, the values of the strength of the recrystallized molybdenum were assumed to be 450, 109, 85, 78 and 62 MPa at temperatures 20 • C, 1000 • C, 1200 • C, 1300 • C and 1400 • C, respectively [18].…”

Internal Crystallisation Method to Produce Oxide Fibres and Heat Resistant Composites

“…First of all, it should be noted that the strength of fibres produced by using ICM as well as that of all structural fibres depends on their surroundings: the results of testing separate fibres can drastically differ from the effective strength of the fibre in a matrix [40].…”

Microstructure, physical properties and hardness of alumina short fibres/nickel matrix composites fabricated by powder technology

“…But these reaction-formed defects as well as any original surface defects in the virgin fibre can be filled or healed by the matrix material so that the fibre residing in the matrix can exhibit diminished sensitivity to surface defects as compared to isolated fibres extracted from the matrix. 20,21 In order to develop fibre/ Nibased composites for heat-resistant applications, three main points should be emphasized: interface phenomena, availability of suitable fibres and optimization of composite microstructure. Ceramic-metal composites combine important properties, such as high magnetization, high Curie temperature, low hysteresis loss and low dielectric loss at high frequencies.…”