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refractory materials crack function

  • Detection of cracks in refractory materials by an

    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 …

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  • Fatigue Crack Growth in Plasma-Sprayed

    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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  • Detection of cracks in refractory materials by an

    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 …

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  • Location of cracks in refractory material

    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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  • (PDF) Reasons for crack propagation and

    2016-4-1 · mullite refractory materials have been evaluated in this paper. In particular, the materials were subjected to repetitive thermal shocks by the water-quench tech-nique and subsequently the fracture toughness was eval-uated using a Chevron notched specimen technique accompanied by an acoustic emission measurement monitoring crack propagation.

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

    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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  • FRACTURE BEHAVIOUR OF REFRACTORY CERAMICS

    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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  • A procedure for evaluating the crack resistance

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

    Generally speaking, most of the cracks we see in refractories are more of an aesthetic nature and not function. Here’s an example of a cracked refractory that is in good shape. Most cracks are not something to be afraid of. For example, with a brick installation, each brick is surrounded by a crack to relieve local stress.

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  • Refractories | IMCE - Your partner in the Impulse ...

    At elevated temperatures, the Young’s modulus for refractory and castable materials is a mechanical property relatively sensitive to the evolution of the microstructure and can be characterized by the impulse excitation technique (IET) as function of the temperature.

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  • Controlled Crack Propagation Experiments with a

    2012-1-1 · The resistance against fracture of the AZT material and, for comparison, of a pure alumina refractory was examined by controlled crack propagation experiments. Wedge splitting and compact tension tests with in situ crack growth observation, partially on microstructural level, have been performed for both materials.

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  • Corrosion Fatigue of Refractory Materials in

    2005-9-6 · Refractory materials such as zirconium, niobium and titanium alloys with excellent corrosion resistance in boiling nitric acid have been selected for use as structural materials of spent fuel reprocessing equipment. ... the fatigue crack growth rates of these materials were investigated by load control tests as a function of the …

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  • Journal of the European Ceramic Society

    2021-2-23 · damage process of ordinary refractory ceramics [20,21], which result in the difficult determination of crack tip and crack length for R-curve evaluation. Normally, the crack length evolution was evaluated from the compliance function [22]. Furthermore, different techniques could also be used for the determination of the crack lengths, such …

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  • (PDF) Microstructural investigation and thermal

    In both materials pores are not spherical, indicating an early stage of sintering, as discussed elsewhere [1,9].The observed crack propagation behaviour should have direct implications in the different roomtemperature mechanical behaviour and different thermal shock resistance exhibited by the REFO and CONC materials.

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  • US6864199B2 - Crack-resistant dry 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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  • Experimental Characterization and

    damage in refractory materials. Whereas with analytical models53,54,55,56 to calculate the effect of thermal shock it was only possible to describe very simple-shaped re-fractories, using the finite element method 57,58,59,60,61, the evolution of thermally induced stresses by modelling refractory components and parts of them was possible.

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  • (PDF) Service life prediction for refractory

    Determination of thermal shock resistance in refractory materials by ultrasonic pulse velocity measurement. By Cristina Leonelli. A lifetime prediction method based on Cumulative Flaw Length Theory. By Marcello Romagnoli.

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  • Selection of Proper Refractory Materials for

    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 …

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  • Crack Security Influence on Refractory Design

    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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  • Crash Course on Refractory Products for a New

    2019-11-28 · Because ceramic tool materials are sensitive to defects such as microcracks, this paper develops ceramic tool materials with crack healing function to solve this problem. In this paper, Al2O3/TiC/TiB2 ceramic tool materials were prepared by …

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  • US6864199B2 - Crack-resistant dry refractory -

    Refractory products come in many different shapes and sizes and are dependent upon how they are going to be used. Typically, refractories are going to be built using one of three different types of refractory materials: Bricks are going to be utilized in most furnaces; Fiber blanks are used for linings

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  • Experimental Characterization and

    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.

    Get Price
  • The function and advantages of tap ... - Wanhao

    damage in refractory materials. Whereas with analytical models53,54,55,56 to calculate the effect of thermal shock it was only possible to describe very simple-shaped re-fractories, using the finite element method 57,58,59,60,61, the evolution of thermally induced stresses by modelling refractory components and parts of them was possible.

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  • Effects and Analysis of Thermal Stresses on Large ...

    The function and advantages of tap hole clay Tap hole clay is used to seal the taphole refractory, at present there are water stemming and can be divided into two types: anhydrous tap hole clay, the former is used in low pressure, strengthening smelting degree is not high, the small blast furnace, the latter in high top pressure, high degree of …

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  • HARBISON-WALKER Handbook of Refractory

    2020-5-28 · improvements in the refractory materials to handle thermal shock are of course beneficial, the ... coil and is a key element in the overall function of the lining. Contained in the coil is the ... or one piece lining acting as a one large unit will crack and spall given the thermal forces that are put upon it as shown in the earlier examples ...

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  • Damage Detection of Refractory Based on

    2020-2-26 · refractory producers; and Magnesitwerk Aken, a German refractory maker. • In 1998, Harbison-Walker acquired A.P. Green Industries, Inc. With 22 plants in six countries, A.P. Green, a major refractory producer in its own right, expanded considerably the global resources at Harbison-Walker’s disposal. • In 2000, RHI AG, an Aus-trian company ...

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  • All articles - Journal of Ceramic Science

    Acoustic emission (AE) technique is a common approach to identify the damage of the refractories; however, there is a complex problem since there are as many as fifteen involved parameters, which calls for effective data processing and classification algorithms to reduce the level of complexity. In this paper, experiments involving three …

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  • Crack Security Influence on Refractory Design

    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.

    Get Price
  • Surface crack network detection on MgO-based

    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 …

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  • SELECTING LINING MATERIALS TO ACHIEVE LONG

    2017-11-28 · consideration when selecting refractory materials and designing hearth walls for best ... Function: Marketing Director, UCAR® Refractory Systems, GrafTech International, Columbia, Tennessee, USA ... the block will crack (typically within 200 mm of the shell). Van Laar and Andreev add this important fact to be

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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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  • Paper - refractories-worldforum.com

    2011-10-6 · GHI/RWTH-Aachen Institute of Mineral Engineering – Department of Ceramics and Refractory Materials 52062 Aachen/Germany. Revision 06.10.2011, 24.10.2011. Volume 4, Issue 2, Pages 121 - 126. Abstract. The work herein correlates the damping measurements and the microstructural modifications of refractory castables …

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  • Effect of Specimen Size on the Resistance to

    2016-6-10 · K as a function of the normalized crack length, c n, for a hot prismatic bar, when it is submitted to a thermal shock at a critical temperature. The equation of K is shown below. The parameter c n is obtained by dividing the pre existing crack lengh, c, by W (c n = c/W). An arrow in Figure 2 indicates the dependence of K and c n

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  • REFRACTORY Calderys Refractory Lances

    2019-5-15 · REFRACTORY VOL. 62 NO. 11 IRON & STEEL REVIEW | 89 | APRIL 2019 Calderys Refractory Lances Applications and Benefits l Quick justification of the casting temperature (Argon-Lances) l Better removal of non-metallic inclusions (Argon-Lances) l Heating up the temperature of the melt (Oxygen-Lances) l In case the purging plug does …

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  • Brazilian refractory grade bauxite: a new alternative

    2019-3-18 · characteristic properties of each refractory category are a function of both their raw materials and the methods used to manufacture the refractory products. Most refractory materials are supplied as preformed shapes, but the monolithic category has evolved and grown significantly in the past

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  • HARBISON-WALKER Handbook of Refractory

    2020-2-26 · refractory producers; and Magnesitwerk Aken, a German refractory maker. • In 1998, Harbison-Walker acquired A.P. Green Industries, Inc. With 22 plants in six countries, A.P. Green, a major refractory producer in its own right, expanded considerably the global resources at Harbison-Walker’s disposal. • In 2000, RHI AG, an Aus-trian company ...

    Get Price
  • International Journal of Refractory Metals and

    The ISSN of International Journal of Refractory Metals and Hard Materials is 0958-0611 . An ISSN is an 8-digit code used to identify newspapers, journals, magazines and periodicals of all kinds and on all media–print and electronic. International Journal of Refractory Metals and Hard Materials Key Factor Analysis

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  • Refractory Selection Guide for ... - Materials

    2011-4-26 · The function of a Fluid Catalytic Cracking Unit (FCCU) is to crack feedstock such as crude residues and gas oil and produce distillates. The process generally requires heat to complete the reaction. This in turn requires a boiler. Refractories used in coal fired boilers are outlined.

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  • Several types of damage commonly found in

    Refractory materials are the material basis of glass kiln, which has a great impact on the overall efficiency of the kiln, and must be carefully selected. Refractory materials Not only a large amount of water, a 500t d class of float glass furnace kiln is about 5000t refractory material, and its cost accounts for the main proportion of the entire kiln cost …

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  • Refractory Terms - Total Refractory Management

    2021-5-21 · Reactors often are lined with refractory materials to increase insulation, prevent corrosion and protect the outer shell from the chemicals mixed in the reactor. Reformers Reforming is the technique in which the molecular structure of a hydrocarbon is rearranged to change the properties of the hydrocarbon.

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  • Brazilian refractory grade bauxite: a new alternative

    2019-3-18 · characteristic properties of each refractory category are a function of both their raw materials and the methods used to manufacture the refractory products. Most refractory materials are supplied as preformed shapes, but the monolithic category has evolved and grown significantly in the past

    Get Price
  • Refractory Materials: 2016

    2016-12-20 · 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 ...

    Get Price
  • AOI [1] Advanced Manufacturing of Ceramic with

    2020-11-5 · The specific project objectives are as follows: Task 2‐Materials Development: Define high‐temperature, stable conductive ceramics to be embedded within refractory anchors. Task 3‐Robotic Direct‐Writing of Sensors: Develop 2D/3D direct‐writing printing technology to pattern sensor circuit arrays into anchor refractory.

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  • A Novel Processing Route for Alumina/Mullite-Based ...

    2016-1-2 · alumina and mullite particles lead to intact and crack-free parts even after sintering at 1650 °C. 1 Introduction There is an increasing need in carbon-free refractory materials, e.g. for steel casting. One of the promising candidates for this purpose is mullite, which is a binary oxide ceramic material with a composition varying from 3Al 2 …

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  • International Journal of Refractory Metals and

    ISSN The ISSN of International Journal of Refractory Metals and Hard Materials is 0958-0611 .An ISSN is an 8-digit code used to identify newspapers, journals, magazines and periodicals of all kinds and on all media–print and electronic. International Journal of Refractory Metals and Hard Materials Key Factor Analysis

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  • THERMO-MECHANICAL DESIGN OPTIMIZATION OF

    Iranian Journal of Materials Science & Engineering Vol. 7, Number 3, Summer 2010 35% mullite, 39% cordierite and 26% non-mullitised andalusite that leading to a significant thermal expansion mismatch between different phases (Table 2). Difference of thermal expansion between the constituents of refractory materials can lead,

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  • Casting Investment Powder Performances -

    Refractory materials can withstand high temperatures without decomposing. Silica serves this function. Bonding materials are what hold the refractory materials in place to form a mold. This is the purpose of gypsum. Controlling chemicals are used to control how quickly the bonding materials set up and to accentuate various investment properties.

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