Abstract:At present, at least three families of heat resistant materials of an enhanced use temperature are developing: 1. Ceramic matrix composites (CMCs); 2. Metal matrix composites (MMCs);
“…The X-ray diffraction pattern taken from a cross-section of a specimen with α = 0.032 obtained at a pulling rate of 50 mm/min shows the existence of three oxides, Al 2 O 3 , CaAl 12 O 19 (CA6), and Ca 3 Al 2 O 6 . This is in accordance with the observations just described.…”
Section: Mechanical Properties Of Oxide/molybdenum Compositesmentioning
confidence: 99%
“…The aim of the present work was to obtain sapphire/CA6 composite oxide fibres by using the internal crystallisation method, which is actually the crystallisation of an appropriate melt in the cylindrical continuous channels of a molybdenum matrix [6,12]. The molybdenum matrix is normally made by diffusion bonding of an assemblage of molybdenum foil and wires, so that two surfaces of the fibre are flat.…”
Section: Fabrication Of Composite Fibresmentioning
confidence: 99%
“…This remains to be carried out. It should be noted that in the Al 2 O 3 -CaO system, there are a number of the complex oxides in addition to CaAl 12 [4]. An occurrence of these oxides in the fibres is not to be excluded.…”
Section: Microstructure Of the Fibresmentioning
confidence: 99%
“…The method has been successfully used to produce a large family of single crystalline and eutectic oxide fibres [6]. The state of the art of ICM technology is described in a recent review paper [12].…”
Section: Introductionmentioning
confidence: 99%
“…A usual way to organise such a kind of the interface is by coating a continuous fibre with an appropriate material. For example, in the case of oxide-fibre/oxide-matrix composites, polycrystalline fibres are often coated with calcium hexaaluminate CaAl 12 O 19 (CA6) [3]. The values of lattice parameters of CA6 are a = 0.47597 nm, c = 2.29918 nm [4], which make the substance mica-like.…”
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.
“…The X-ray diffraction pattern taken from a cross-section of a specimen with α = 0.032 obtained at a pulling rate of 50 mm/min shows the existence of three oxides, Al 2 O 3 , CaAl 12 O 19 (CA6), and Ca 3 Al 2 O 6 . This is in accordance with the observations just described.…”
Section: Mechanical Properties Of Oxide/molybdenum Compositesmentioning
confidence: 99%
“…The aim of the present work was to obtain sapphire/CA6 composite oxide fibres by using the internal crystallisation method, which is actually the crystallisation of an appropriate melt in the cylindrical continuous channels of a molybdenum matrix [6,12]. The molybdenum matrix is normally made by diffusion bonding of an assemblage of molybdenum foil and wires, so that two surfaces of the fibre are flat.…”
Section: Fabrication Of Composite Fibresmentioning
confidence: 99%
“…This remains to be carried out. It should be noted that in the Al 2 O 3 -CaO system, there are a number of the complex oxides in addition to CaAl 12 [4]. An occurrence of these oxides in the fibres is not to be excluded.…”
Section: Microstructure Of the Fibresmentioning
confidence: 99%
“…The method has been successfully used to produce a large family of single crystalline and eutectic oxide fibres [6]. The state of the art of ICM technology is described in a recent review paper [12].…”
Section: Introductionmentioning
confidence: 99%
“…A usual way to organise such a kind of the interface is by coating a continuous fibre with an appropriate material. For example, in the case of oxide-fibre/oxide-matrix composites, polycrystalline fibres are often coated with calcium hexaaluminate CaAl 12 O 19 (CA6) [3]. The values of lattice parameters of CA6 are a = 0.47597 nm, c = 2.29918 nm [4], which make the substance mica-like.…”
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.
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