Microstructure evaluation of MgO–C refractories with TiO2- and Al-additions

Aneziris, Christos G.; Hubálková, Jana; Barabás, Réka

doi:10.1016/j.jeurceramsoc.2006.03.001

Cited by 141 publications

(73 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…By using artificial resins -as alternative environmental friendly products against tar pitch bonded products -a higher isotropic glassy phase with lower oxidation resistance and more brittle bonding is obtained. [20] In order to decrease this ''brittle behavior'' and increase the oxidation resistance environmental friendly artificial tar pitch binders as additions or as main binder parts are used. [21] The oxidation of carbon bonded refractories during service is one of their major disadvantages.…”

mentioning

confidence: 99%

Reactive Filters for Steel Melt Filtration

et al. 2012

View full text Add to dashboard Cite

There exists an increasing pressure on the metal-making and metal-using industry to remove solid and liquid inclusions such as deoxidation products (oxides), sulfides, nitrides carbides, etc. and thereby improve metal cleanliness. It is well known that size, type, and distribution of non-metallic inclusions in metal decrease dramatically the mechanical properties and especially the fracture toughness, the tensile strength, the ductility as well as the fatigue of the cast products resulting to excessive casting repairs or rejected castings. [1] In case of the oxide inclusions in steel melts, Wasai et al. [2] assigned the dendritic, maple-like and polygonal inclusions to the group of the primary inclusions generated directly after adding aluminum in the metal melt. In contrast, the network-like, coral-like, and spherical inclusions, which are composed of alumina, hercynite, and wü stite, are classified as secondary inclusions. The secondary inclusions are formed due to the lower solubility of oxygen in the melt as a function of the temperature above the liquidus temperature of the melt. In case of the secondary inclusions, the a-, g-, and d-alumina modification are more frequently detected in steel melts. Below the liquidus temperature tertiary and quartenary inclusions are generated that present the highest impact on fractures toughness of steel casts according to Ovtchinnikov. [3]

show abstract

mentioning

confidence: 99%

Reactive Filters for Steel Melt Filtration

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Por exemplo, pós metálicos de Mg e Al são freqüentemente adicionados a refratários de MgO-C, enquanto SiC e B 4 C são usados em refratários de Al 2 O 3 -C [16]. Vários trabalhos foram desenvolvidos visando o entendimento do comportamento da atuação destes antioxidantes, porém a maioria destes estudos foram realizados para o sistema MgO-C [7][8][9][10][17][18][19][20][21][22]. Cada antioxidante atua em diferentes faixas de temperatura assim, o uso de mais de um tipo de antioxidante pode complementar a ação destes materiais na prevenção da oxidação do carbono.…”

Section: Principais Antioxidantes Usados Em Materiais Refratáriosunclassified

Artigo revisão: atuação dos antioxidantes em refratários contendo carbono

Luz

Pandolfelli

2007

Cerâmica

View full text Add to dashboard Cite

ResumoOs materiais refratários contendo carbono têm despertado grande atenção nos últimos anos, uma vez que são amplamente utilizados na indústria siderúrgica em virtude de suas excelentes propriedades. A presença do carbono nos refratários contribui para o aumento da resistência ao choque térmico, da energia de fratura e da resistência ao ataque por escória. Entretanto, a principal desvantagem do seu uso é a sua alta susceptibilidade a oxidação. Com o objetivo de manter o carbono presente na estrutura do material refratário o maior tempo possível, algumas medidas são requeridas para reduzir sua oxidação sob condições operacionais. Desta forma, o uso de substâncias conhecidas como antioxidantes tem sido extensivamente estudado. Os principais antioxidantes, suas características e formas de atuação são abordados nesta revisão. A formação de novos compostos devido à reação entre os antioxidantes com o carbono, nitrogênio, oxigênio e o próprio material refratário pode provocar um preenchimento parcial dos poros e redução da taxa de interdifusão dos gases, havendo assim a prevenção da oxidação do carbono presente no refratário. Palavras-chave: antioxidantes, refratários contendo carbono. Abstract

show abstract

“…This limitation with respect to temperature is conditional to a certain degree and it depends on the composition of finely dispersed components of the article charge, and also on the form and amount of binder, form and amount of antioxidant, and its dispersion [4,5]. With open porosity within the limits 0.9 -8.4% (see Table 7) the main part of the metal component-antioxidant (Al, Si, Al + Si, etc.)…”

Section: Study Of Carbon-containing Refractories For Steel Smelting Pmentioning

confidence: 99%

Study of carbon-containing refractories for steel smelting production units

Kashcheev¹,

Zemlyanoi²,

Visloguzova³

et al. 2007

Refract Ind Ceram

View full text Add to dashboard Cite

Carbon-containing refractories exhibiting different or similar resistance in steel smelting production units are studied. Properties are analyzed for articles of domestic and overseas production under conditions of a single metallurgical plant. The greatest resistance is demonstrated by articles containing a liquid binder with a significant amount of coke residue, a greater amount of fine fractions of a mineral filler, and additions of finely dispersed carbon. The substance and grain size composition and production technology form an article structure with a specific pore distribution with respect to size. The amount of pores smaller than 45 mm and an increase in their content govern an increase in refractory resistance.Carbon-containing refractories play a leading role in steel production. In recent years there has been considerable expansion in the assortment of articles and there has been an increase in the number of refractory producers. Production of carbon-containing refractories in different enterprises has much in common and is mainly identical [1], but there are differences that give rise to certain properties of the finished product. Under these conditions a large role is given to monitoring products entering metallurgical enterprises, and a study of articles after service with the aim of overcoming the reasons and clarifying the mechanisms for refractory failure.The technology of steel production in large metallurgical enterprises specifies melting of metal in converters, processing outside furnaces in devices of the furnace-ladle type, vacuum treatment, and pouring of metal in continuous billet casting machines (CBCM). There are marked differences in the technology of different treatments: composition of slags and metal, production regimes and other numerous factors that have an effect of refractory resistance. For example, the time of metal and slag in steel pouring ladles may vary from 60 -80 to 240 min (depending of the grade of steel), and the temperature of the slag in furnace-ladle units may increase to 2000°C. Under these conditions chemical interaction and infiltration of slag into the refractory becomes an important factor governing refractory resistance.Results are given in this article for analyzing the properties of carbon-containing articles of domestic and overseas production under operating conditions of one metallurgical plant in the period 2003 to 2006. In individual cases analysis was performed for carbon-containing articles after service with the aim of clarifying the physicochemical properties and the behavior of refractories during heating. The chemical composition of the test refractories from different producer firms is provided in Tables 1 and 2.The main attention was devoted to analyzing the substance composition and physicomechanical property indices for ladle refractories since their operating life differs markedly from the service life of converter articles. The average resistance of periclase-carbon refractory articles of the pro-

show abstract

Microstructure evaluation of MgO–C refractories with TiO2- and Al-additions

Cited by 141 publications

References 6 publications

Reactive Filters for Steel Melt Filtration

Reactive Filters for Steel Melt Filtration

Artigo revisão: atuação dos antioxidantes em refratários contendo carbono

Study of carbon-containing refractories for steel smelting production units

Contact Info

Product

Resources

About