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refractory materials crack function

  • Detection of cracks in refractory materials by an enhanced ...

    Its application is led on magnesia-spinel refractory materials, specifically to highlight and to characterize the evolution of kinematic fields (displacement and strain) observed at the surface of...

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  • Detection of cracks in refractory materials by an enhanced ...

    2017-9-11 · This paper is devoted to the study of the fracture behaviour of two industrial refractory materials thanks to the development of a new technique of digital image correlation (DIC). DIC, already known as a helpful and effective tool for the measurement of displacement and deformation fields in materials, has been adapted to take into account displacement discontinuities as cracks.

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  • Fatigue Crack Growth in Plasma-Sprayed Refractory Materials

    2018-11-13 · Remote crack closure K oc as a function of crack length a. Mo samples are tested with preload and W samples without preload

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  • (PDF) Reasons for crack propagation and strength loss in ...

    2017-6-30 · Refractory bricks which have internal cracks need to be segregated from the good ones. This is a critical pro-cess during the production stage. The Pundit 200 is a best-in-class Ultrasonic Pulse Velocity (UPV) test instrument for examining the quality of concrete and other materials such as refractory material, rock, wood and ceramics. The

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  • Location of cracks in refractory material

    1989-7-1 · In order to evaluate the crack resistance of polycrystalline refractory materials, one can employ the scheme of transverse compressive loading. However, in this case, it is necessary to use large-sized specimens. The characteristics of crack resistance decrease with decreasing dimensions of the specimens in their plan.

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  • A procedure for evaluating the crack resistance of ...

    2008-6-1 · When refractory materials are subjected to industrial thermal cycles crack initiation and/or propagation occurs resulting in loss of stiffness, mechanical strength, and overall material degradation. The practical and economic effects of thermal-shock damage on refractories are reflected in the ever increasing number of research projects devoted to improve the thermal-shock resistance of refractory materials …

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  • Service life prediction for refractory materials ...

    concerning the elastic changes in the refractory castable samples that have been subjected to progressive thermal shocks. A severe depletion of the modulus of elasticity (MOE) is noticeable during crack nucleation followed by a steady decrease of this elastic property corresponding to the crack propagation 1. In this connection, damping

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  • Estimation of Damage in Refractory Materials after ...

    2013-8-1 · It must be highlighted that the refractory materials brittleness can be defined by the ratio of the stored elastic strain energy at crack initiation and its work of fracture . Some authors [13] also state that a decrease of brittleness is mainly attained by a reduction of strength and, therefore, stronger refractories should not be the best option.

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  • Thermal shock damage evaluation of refractory castables ...

    2019-1-1 · Refractories are solid materials that can withstand high temperatures and maintain their mechanical function for a required period of time under all circumstances, even in contact with corrosive liquids or gases.

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  • There's a Crack in My Refractory | F.S. Sperry | F.S ...

    2020-1-17 · REFRACTORY AND CERAMIC MATERIALS CRACK RESISTANCE OF MODERN CERAMICS AND CERAMIC COMPOSITES. II. EF METHOD G. A. Gogotsi UDC 621.762 The procedure and test results are for crack resistance are presented for various monolithic and composite oxide and nonoxide ceramics by chipping the rectangular edge of a polished specimen. The

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  • REFRACTORY AND CERAMIC MATERIALS - CORE

    2008-1-1 · The refractory materials exhibit different thermal shock failure mechanisms, i.e. RSE being characterized by early crack initiation and slow crack propagation, while BRT exhibiting delayed crack initiation and fast fracture propagation.7, 10 The best performance under service life relevant thermal shock conditions was achieved with BRT ...

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  • Assessment of viscoelastic crack bridging toughening in ...

    If the crack can cause the refractory to loosen or fall out, then heavy cycling can cause cracks to propagate as the slags/product get into the cracks and make them worse (ex: the crack contracts when cool, debris trickles into the crack, then on heat up the crack cannot fully close).

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  • Crash Course on Refractory Products for a New Plant ...

    2008-6-1 · The materials have been tested previously on-duty in industrial kilns and they appear to exhibit different thermal-shock failure mechanisms: one material (RSE) being characterized by early crack initiation and slow crack propagation, whilst the second material (BRT) exhibiting delayed crack initiation and fast fracture propagation .

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  • Service life prediction for refractory materials ...

    2019-7-31 · The fracture behaviour of rebound magnesia-chrome refractory varies from brittle to less brittle while the thickness increasing from 10 mm to 50 mm. The quasi-stable crack propagation favors the central crack initiation and ensures the …

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  • Fracture behaviour of magnesia refractory materials in ...

    Self-repairing function is observed in carbon-containing refractory such as MgO–C, Al2O3–C, and so forth. Non-oxides such as pure metallic, alloys, carbides, and nitrides are intentionally ...

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  • Self-Repairing Function in the Carbon-Containing Refractory

    2020-11-29 · Abstract. Refractory design, installation, and maintenance are discussed in this chapter. The different aspects of refractory design, e.g., as arch design, roof design, expansion joints in the lining, and the stress developed in the lining in …

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  • 13 Types of Refractory Materials and Their Applications

    2020-4-1 · As the refractory materials show high heterogeneity, the localization of macro-crack is random in the center zone and the crack path is not horizontal linear. To locate the macro-crack path within the section of displacement measurement for all the specimens, the displacement between P2–P5 (interval of 20 mm) is considered as the localized ...

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  • A procedure for evaluating the crack resistance of ...

    In order to evaluate the crack resistance of polycrystalline refractory materials, one can employ the scheme of transverse compressive loading. However, in this case, it is necessary to use large-sized specimens. The characteristics of crack resistance decrease with decreasing dimensions of the specimens in their plan.

    Get Price
  • Thermal shock damage evaluation of refractory castables ...

    2013-8-1 · When refractory castables are submitted to continuous thermal changes, crack nucleation and/or propagation can take place resulting in a loss of mechanical strength and overall degradation of such materials. This work evaluates the thermal shock damage cycling of high-alumina and mullite refractory castables designed for petrochemical application.

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  • (PDF) Mechanical and Thermal Shock Behavior of

    For refractory materials the WOF NBT ratio in many cases is found to be a reliable indicator, as well as the R thermal shock parameter, to determine crack propagation resistance after thermal shock. The R values for our materials are relatively large compared to those of dense ceramic materials.

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  • Refractory Coating Materials - Rongsheng Refractory

    2021-4-28 · Refractory Coating Materials Refractory Coating Material Description ... Why this tundish coating material has the function of cleaning steel liquid is because CaO in coating material can adhere oxides(SiO2, Fe2O3, Al2O3, etc), P, S and other impurities in steel liquid. ... coating layer won’t crack or spall.

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  • FRACTURE BEHAVIOUR OF REFRACTORY CERAMICS AFTER

    2016-4-1 · systems where each constituent has a specific function in the material. Examples of such composite systems are the cordierite-mullite refractory materials investi-gated in a number of investigations [2-5]. Cordierite and mullite are ceramic materials suit-able for high temperature refractory components with good chemical resistance [3, 6].

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  • Assessment of viscoelastic crack bridging toughening in ...

    Assessment of viscoelastic crack bridging toughening in refractory materials Dino Boccaccini, M. Cannio, T. D. Volkov-Husoviae, I. Dlouhy, M. Romagnoli, P. Veronesi, C. Leonelli Research output : Contribution to journal › Journal article › Research › peer-review

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  • 13 Types of Refractory Materials and Their Applications

    2000-2-15 · The extent of salt penetration into the refractory could be determined by monitoring the potassium concentration as a function of depth. Such penetration occurred along the length of cracks through the laser-treated zone, but there was no indication of significant penetration into the surface in crack-free regions.

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  • Flame-assisted laser surface treatment of refractory ...

    A dry refractory composition having superior resistance to crack propagation. The dry refractory composition includes at least matrix materials and metal fibers. The composition also may include dense refractory aggregate. The dry refractory composition is particularly suitable for use in metal containment applications.

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  • US6864199B2 - Crack-resistant dry refractory - Google

    2020-4-1 · As the refractory materials show high heterogeneity, the localization of macro-crack is random in the center zone and the crack path is not horizontal linear. To locate the macro-crack path within the section of displacement measurement for all the specimens, the displacement between P2–P5 (interval of 20 mm) is considered as the localized ...

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  • Crack Security Influence on Refractory Design with Thermo ...

    Attributes the crack state-of-art stress strain field using the J-integral, has established in the ladle refractory in the thermal load and under the molten steel load function its crack secure relations, and obtained the crack security change rule. These results have provided the support rationale to the equipment safe operation.

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  • Refractory Material - an overview | ScienceDirect Topics

    Refractory materials, like all solids, expand on heating, the degree of expansion being related to the chemical composition of the refractory.Magnesium oxide has the highest coefficient of expansion of the refractory materials commonly used. Silicon carbide has a comparatively low coefficient of expansion and fused or vitreous silica has the lowest expansion of all the refractory materials ...

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  • Determination of thermal shock resistance in refractory ...

    2007-1-1 · When refractory materials are subjected to the industrial thermal cycles crack nucleation and propagation occurs resulting in loss of strength and material degradation. The formation of cracks decreases the velocity of ultrasonic pulses travelling in the refractory because it depends on the density and elastic properties of the material.

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  • Thermal shock damage evaluation of refractory castables ...

    2013-8-1 · When refractory castables are submitted to continuous thermal changes, crack nucleation and/or propagation can take place resulting in a loss of mechanical strength and overall degradation of such materials. This work evaluates the thermal shock damage cycling of high-alumina and mullite refractory castables designed for petrochemical application.

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  • Surface crack network detection on MgO-based refractory ...

    2021-3-16 · 1 Surface crack network detection on MgO-based refractory castable by digital image correlation R. G. M. Saracura1, R. B. Canto1, V. C. Pandolfelli1, N. Schmitt2,3, F. Hild2 1Department of Materials Engineering (DEMa), Federal University of São Carlos (UFSCar), Brazil 2Laboratoire de Mécanique et Technologie (LMT-Cachan), ENS Cachan CNRS PRES UniverSud Paris, France

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  • Refractory Repair Products - Products - Rex Materials Group

    Pyroform E-Z Fill is Rex Materials' premium joint and crack repair moldable. It was developed specifically to spread easily and finish smoothly for faster and better joint construction. E-Z Fill is formulated to securely bond between sections of Pyroform HP™, HP-45, PYROLITE® and other refractory segments. It has very good strength and abrasion resistance for long life.

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  • Refractory Materials for Flame Deflector Protection

    2008-12-17 · • Shall not crack or spall after exposure to a launch environment, • Shall not erode more than 1/8 inch after exposure to a launch envi ronment, and • Shall have a maximum heat flux of 3,300 BTU/ft2-s — 895 cal/cm2-s = 3746 W/cm2. In this paper, testing results of some alternate refractory materials are compared with the physical ...

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  • Selection of Proper Refractory Materials for Energy Saving ...

    2012-1-6 · Refractory lining of an aluminum melting and holding furnace are engineered with a primary design objective to keep the furnace condition stable throughout the life of the furnace. In consideration of energy saving, ideally all the heat added to the furnace should be used to heat the load or stock but in practice, a lot of heat is lost in several ways.

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  • Fire Bricks and Other Refractory Materials: An Overview

    2020-6-25 · Corrosion tests for refractory materials intended for the steel industry – A reiew Ceramics – Silikáty 64 (3) 278-288 (2020) 279 (with the precipitation of new phases at the surface of the refractory brick). The former (direct) dissolution mode is usually faster and more aggressive than the latter (indirect).

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  • Optical crack growth measurements applied to a refractory ...

    material nonlinear effects are not taken into consideration. For a (brittle) material with a small nonlinear zone in comparison with the total size of the structure, the LEFM gives a good description of the mechanical behaviour [6]. LEFM is, however, not applicable for materials with a relative large process zone in front of the crack tip.

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  • Question: What Is Refractory Concrete? - Ceramics

    Refractory Concrete. concrete capable of retaining its physicomechanical properties within predetermined limits during prolonged exposure to high temperatures. Refractory concrete is used in the construction of thermal units and the foundations of industrial furnaces and other structures subjected to prolonged heating. What is refractory cement made of? By volume, it is 3:3:4 …

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  • Refractory Standards - ASTM

    These refractory standards help materials science laboratories, material processing companies, product manufacturers, and other producers and users of such materials and products in their proper fabrication and treatment procedures to ensure good …

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  • Refractories: Refractories

    2009-11-17 · Refractories are materials that can withstand high temperatures without softening or deformation in shape. Refractories are mainly used for construction of lining in furnaces, kilns, converters, etc. The main function of a refractory is to withstand and maintain high temperatures and to resist the abrasive and corrosive action of molten metals ...

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  • Common causes of refractory failure | Engineer Live

    2017-8-4 · Dissimilar refractory materials adjacently located are common, particularly surrounding openings such as doors (fibre and brick), peep sights (IFB, castable, fibre modules), burner blocks and pressure relief doors. Because dissimilar materials have different refractory properties at elevated temperatures, this makes a homogenous design difficult.

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  • INTRODUCTION TO CERAMICS, GLASS AND REFRACTORIES

    2017-4-18 · Refractories are materials that can withstand high temperatures without softening or deformation in shape. Refractories are mainly used for the construction of lining in -furnaces, kilns, converters, etc. The main function of a refractory is to withstand and …

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  • Refractory Materials for Energy Applications

    Refractory Materials for Energy Applications SteffenAntusch,*Jens Reiser, JanHoffmann, andAlexandru Onea[a] Introduction In the framework of the European material development programme for fusion power plants beyondthe international thermonuclear experimental reactor (ITER), tungsten is being considered as apotential plasma-facing material. This

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  • Refractory Materials: October 2016

    2016-10-27 · Refractory materials is not less than 1580 ℃ refractoriness of inorganic non-metallic materials. But just to define the refractoriness cannot fully describe the refractory materials, 1580 ℃ is not absolute. Now defined as any physical and chemical properties to allow its use in high temperature environment is called refractory material ...

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