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FACTORS AFFECTING SELECTION AND PERFORMANCE OF STEEL-FIBER-REINFORCED MONOLITHIC REFRACTORIES.
Abstract
The service life of monolithic refractories is being extended in a number of applications through the use of steel fiber reinforcement of the refractories. The effectiveness of the reinforcement is controlled by a number of factors, including the amount of fiber, fiber aspect ratio, and fiber properties (yield strength, corrosion resistance, oxidation resistance), as well as by the parameters of the service environment. Data are presented on the effect of these factors on the engineering properties and performance in service of steel fiber reinforced refractories. Guidelines are given regarding asssessment of the suitability of these materials for a particular application.
... E-mail address:ameddah2004@yahoo.fr properties of steel fibre reinforced refractory concrete. Despite this fact, little information [1][2][3][4][5] is available on the effect of fibre geometry on refractory performance and its resistance to thermal shock. ...
Steel fibres are commonly used in refractory industry to reinforce high temperature concretes. Little information is available on the effect of fibre geometry on the refractory concrete and in particular to thermal shock. Eleven different melt extract fibre geometries were investigated with fibre lengths of 10 mm, 25 mm and 50 mm and aspect ratios varying from 14 to 108. Beam specimens made from a proprietary dense hydraulically bonded castable, reinforced with 5% by weight of steel fibre, were cyclically heated and colled on one face in a specially designed spalling furnace to condition them in a simulated service environment Flexural tests were conducted at service and room temperature to obtain toughness indices. The relationship between fibre geometry and toughness indices is discussed.
... In fact, several types of metal fibre reinforced ceramic composite (MFC) have been developed. These include systems based on low alloy steel fibres in cement [12][13][14][15][16][17] and stainless steel fibres in an alumino-silicate matrix [18]. Many such composites have been manufactured by the infiltration of a ceramic slurry into the spaces between a network of fibres, leading to material with a fibre content of between about 5 and 20 vol.%. ...
A model is presented for prediction of the fracture energy of ceramic–matrix composites containing dispersed metallic fibres. It is assumed that the work of fracture comes entirely from pull-out and/or plastic deformation of fibres bridging the crack plane. Comparisons are presented between these predictions and experimental measurements made on a commercially-available composite material of this type, containing stainless steel (304) fibres in a matrix predominantly comprising alumina and alumino-silicate phases. Good agreement is observed, and it’s noted that there is scope for the fracture energy levels to be high (∼20 kJ m−2). Higher toughness levels are both predicted and observed for coarser fibres, up to a practical limit for the fibre diameter of the order of 0.5 mm. Other deductions are also made concerning strategies for optimisation of the toughness of this type of material.
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