(PDF) Mechanical and Thermal Shock Behavior of Refractory
A unified theory of the thermal shock resistance considering the initiation and crack propagation was then proposed 11 12 for high strength refractories with short initial cracks (R ) and for lower strength refractories with larger initial cracks (R ST ) 13 .
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The present invention discloses a dense refractory material which includes a spinel matrix and a micro-crack initiating phase dispersed in the matrix. The micro-crack initiating material introduces micro-cracks into the refractory material which inhibits catastrophic failure as a result of the effects of thermal shock. A method of manufacturing a dense refractory material which includes the
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Aug 29 2014 · Thermal Shock Resistance A refractory typically endures rapid and extreme temperature changes. These fluctuations create thermal stresses within the refractory that can cause rapid expansion or contraction of a section of the material.
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In this article we will discuss about - 1. Meaning of Refractories 2. Properties of Refractories 3. Refractory Fibres 4. Uses. Meaning of Refractories . The term refractories embraces all materials used in the arts for the construction of heat resisting containers using the word in its broadest sense whether it be to afford space for the evolution of gases in combustion processes or the
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May 04 2015 · How To Improve The Thermal Shock Resistance Of Refractories 1) Use materials with a low thermal expansion coefficient or a combination of a raw materials that would result in a 2) Heat up or cool down the refractory line as slowly as possible. From an
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Jun 09 2018 · Kamran Makarian Sridhar Santhanam Zachary N. Wing Thermal shock resistance of refractory composites with Zirconia and Silicon-Carbide inclusions and alumina binder Ceramics International
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article osti_106001 title = Thermal shock and size effects in castable refractories author = Cotterell B and Ong S W and Qin C abstractNote = To study accurately the effects of thermal shock on castable refractories it is necessary to model the fracture process zone. The fictitious crack model which is often used for the analysis of cementitious materials is a suitable way to
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The invention relates to a method for improving the thermal shock resistance of refractory products. Refractory products are used in the iron and steel industry in aggregates of the ceramics industry the cement and lime industry the glass industry the non-ferrous metal industry the chemical and petroleum industry the energy industry and in waste disposal plants.
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corrosion resistance. Furthermore the thermal-shock resistance of refractories can be improved by the addition of high purity sintered spineI. High purity The purity and homogeneous microstructure of Almatis sintered spinels offer considerable ad-vantages over other high purity fused spinels used for the formulation of unshaped and
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Journal of the European Ceramic Society 27 (2007) 1859–1863 Determination of thermal shock resistance in refractory materials by ultrasonic pulse velocity measurement D.N. Boccaccini ∗ M. Romagnoli E. Kamseu Paolo Veronesi C. Leonelli G.C. Pellacani Dipartimento di Ingegneria dei Materiali e dell Ambiente Universit`a di Modena e Reggio Emilia Via Vignolese 905 41100 Modena
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garding their resistance to a single thermal shock has not yet been conducted. Thus the purpose of this study is to compare the ther-mal shock resistance of carbon-free and low-carbon-con-taining refractories with and without nanoscale additives based on alumina mullite and AZT materials. II.
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Severe thermal shocks may cause critical thermal stresses and failure in refractories or ceramic materials. To increase the thermal shock resistance layered material structures are suggested. In order to optimize properties of these alternative structures thermo‐mechanical simulations are required.
Get PriceDEA1Process for improving the thermal shock
The invention relates to a method for improving the thermal shock resistance of refractory products. Refractory products are used in the iron and steel industry in aggregates of the ceramics industry the cement and lime industry the glass industry the non-ferrous metal industry the chemical and petroleum industry the energy industry and in waste disposal plants.
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Thermal shock resistance is refers to the resistance performance of refractory materials. Detection method is to sharp alternate the product environment temperature and record the times of undamaged. Physical properties are the main reason effect thermal shock resistance such as thermal expansion and thermal conductivity etc.
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The RCF fibers are formed into lightweight and easy-to-handle high-temperature insulation products with excellent thermal shock chemical resistance low thermal conductivity and heat loss and low weight. These products include bulk fiber blankets modules paper board vacuum formed parts textiles foam putties adhesives and coatings.
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Resistance to thermal shock is also a vital characteristic for feeder expendable refractories and in spite of its low porosity and high density PSR-930 outperformed our own standard materials and available competitive materials in repeated standard water quench tests.
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Motivated by an application of refractories with resistance to thermal shock in the aerospace industry we have previously designed high-temperature castable ceramic composite materials
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Abstract. 1) Thermal expansion measurements of 11 types of commercially available aluminosilicate refractory brick containing 31--93 AL/sub 2/O/sub 3/ were made by dilatometry from room temperature to 1400/sup 0/C. 2) The linear expansion coefficient correlates linearly with corundum content for high alumina brick containing greater than or equal to60 AL/sub 2/O/sub 3/.
Get PriceRefractories Properties and Types Engineering
In this article we will discuss about - 1. Meaning of Refractories 2. Properties of Refractories 3. Refractory Fibres 4. Uses. Meaning of Refractories . The term refractories embraces all materials used in the arts for the construction of heat resisting containers using the word in its broadest sense whether it be to afford space for the evolution of gases in combustion processes or the
Get Price(PDF) Thermal shock resistance of refractory composites
Motivated by an application of refractories with resistance to thermal shock in the aerospace industry we have previously designed high-temperature castable ceramic composite materials
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It is noted that the important factors in evaluating the thermal-shock resistance of inelastic GKM characterized by a measure of brittleness of less than unity are the inherent R-curve effects the excess of the value of γ wof over the value γ abt the equality of the K Ic determined on specimens with a notch and on those with a sharp crack and the high sensitivity to the rate of thermal and mechanical loading.
Get Price(PDF) Alumina-Mullite Refractories prototypal components
Alumina-mullite (AM) refractories are widely used as liners in gas turbines because of their very peculiar properties. Mullite has high melting point high thermal shock resistance (due to low thermal expansion coefficient) high resistance to creep and chemical corrosion 3 4 and alumina possess high hardness and fracture strength.
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Thermal shock resistance castable. Thermal shock resistance refractory castable. This type product uses superior artificial materials as main raw materials and mix with superior combined binder and super micropowder . it has characteristics of excellent steady thermal shock high refractoriness and high strength which could ensure the whole structure of CFB boiler liner and more suitable for
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Dec 01 2016 · Refractories produced with mullite are of great interest particularly for application in the steel industry because of their high refractoriness excellent thermal shock resistance high creep resistance and good corrosion resistance.
Get Price(PDF) Mechanical and Thermal Shock Behavior of Refractory
A unified theory of the thermal shock resistance considering the initiation and crack propagation was then proposed 11 12 for high strength refractories with short initial cracks (R) and for lower strength refractories with larger initial cracks (R ST).
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Apr 01 2021 · The Alkaline Resistant Bricks used in cement kilns are high-quality refractory bricks with strong alkali-resistant ability good thermal shock resistance and high cost performance. If there is much chlorine in the cement kiln the SiO2 content in the refractory brick can be increased appropriately.
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These linings must have excellent resistance to steel and basic slag corrosion as well as high thermal shock and oxidation resistance. Saint-Gobain services this market with innovative refractories solutions that present high performances and contribute to enhanced steel quality.
Get PriceThermal Shock and Size Effects in Castable Refractories
To study accurately the effects of thermal shock on castable refractories it is necessary to model the fracture process zone. The fictitious crack model which is often used for the analysis of cementitious materials is a suitable way to include the fracture process zone in thermal shock analysis.
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The influence of fiber additives on the mechanical characteristics and thermal shock resistance of the refractory castable with fiber additives was tested. It was found that the addition of carbon fiber has a positive impact on the thermal shock resistance of the investigated castable
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Thermal shock resistance dictates refractory performance in many applications. The thermal shock occurs then object temperature changes much in a short time. It can become a reason of a sudden failure of the lining at the very beginning. So it is important to take the thermal shock resistance into account when selecting and installing
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