Reinforcement of Periclase-Carbon Refractories with Carbon Fibers1

Abstract

The possibility is considered of using carbon fibers as a reinforcing element within the structure of periclase-carbon refractories. Laboratory and industrial test results are provided.Keywords: carbon fibers, reinforcement, periclase-carbon refractories, ultimate strength in bending, ultimate tensile strength.Extensive introduction of carbon-containing (periclasecarbon) refractories in the last fifteen years into steel smelting production has made it possible to increase by several factors the life of the main ferrous metallurgy heating units; converters, arc furnaces, and steel-pouring ladles [1 -3]. An increase in life has been achieved due to a set of unique properties of carbon-containing refractories. i.e., a combination of high refractoriness and temperature for the start of deformation under load. mechanical strength, and chemical resistance. However, currently the increase in improvement of carbon-containing refractories has stabilized for both technical and economic reasons, connected with the quality of raw material, binder compositions, object structure design, and the equipment used.The main reasons for breakdown of carbon-containing refractories are carbon component oxidation, i.e., graphite and binder coke residue [4], and the low quality of refractory filler and graphite [5,6], which worsens mechanical properties and reduces refractory corrosion resistance. Another important factor of carbon-containing refractory breakdown recently has become their inadequate thermal shock resistance (crack resistance), one of the typical symptoms of which is failure of a steel-pouring ladle in the form of vertical cracks (Fig. 1).A traditional method for improving refractory object crack and thermal shock resistance is fiber reinforcement.The structure of a refractory fiber serves as "useful" defects that halt crack propagation, and ion the other hand increase

Review on the elaboration and characterization of ceramics refractories based on magnesite and dolomite

“…Kashcheev [22] 2001 Ways toward improving the technology of refractories based on powdered periclase…”

Effect of sintering atmosphere on microstructures and properties of synthesized microporous MgO refractory raw material

“…[10][11][12] Magnesia-based aggregates are mainly prepared with magnesite by electrical fusion 13 or sintering methods. [14][15][16] These magnesia-based aggregates have dense structure, low porosity, and high thermal conductivity, which is not conducive to the insulation of furnace lining. Thus, Yan et al put forward the lightweight design of using microporous aggregates to replace dense aggregates for fabricating working layer refractories, which can effectively reduce the thermal conductivity of refractories on the basis of ensuring high-temperature service performance.…”

“…Conventional magnesia‐based refractories are prepared with MgO‐based aggregates and magnesia powder as well as other powder 10–12 . Magnesia‐based aggregates are mainly prepared with magnesite by electrical fusion 13 or sintering methods 14–16 . These magnesia‐based aggregates have dense structure, low porosity, and high thermal conductivity, which is not conducive to the insulation of furnace lining.…”