Effect of titania on the microstructure evolution of sintered magnesite in correlation with its properties

Kumar, Prashant; Burhanuddin,; Kumar, Ajay; Ghosh, Arup; Sinhamahapatra, Somnath; Tripathi, Himanshu

doi:10.1016/j.ceramint.2015.03.236

Cited by 13 publications

(9 citation statements)

References 12 publications

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“…CaO, Fe 2 O 3 , and SiO 2 are present as major impurities with small amount of Al 2 O 3 , Na 2 O, K 2 O, and TiO 2 , which corroborate the impure nature of magnesite. Details analysis of raw magnesite has been already discussed in our earlier investigations . XRD patterns of raw magnesite and Y 2 O 3 are shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…Details analysis of raw magnesite has been already discussed in our earlier investigations. 19,20 XRD patterns of raw magnesite and Y 2 O 3 are shown in Figure 1. Apart from magnesite, peaks of quartz and dolomite are also detected, which confirm the presence of quartz and lime.…”

Section: Raw Materials Characterizationmentioning

confidence: 99%

“…[16][17][18] Other effective approach to enrichment in properties of lean-grade magnesite is to incorporate some kind of additive, which could react with the impurities and convert them into some other high melting phases, thereby reduce the formation of low melting compounds and subsequently improve the refractoriness of the sintered magnesite specimens. 19,20 It was reported that presence of titania (anatase phase) increased the hot strength of sintered magnesite samples by forming high melting phases CaTiO 3 and magnesium titanate 19 , and thus reduce the availability of CaO to form Ca-containing low melting compounds. Similarly, high-temperature mechanical strength of off-grade Indian magnesite was significantly improved by adding monoclinic zirconia.…”

Section: Introductionmentioning

confidence: 99%

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Improvement in thermomechanical properties of off‐grade natural magnesite by addition of Y₂O₃

Kumar

Nath

Roy

et al. 2017

Int J Applied Ceramic Tech

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Small amount of Y2O3 (0‐3 wt%) was added into off‐grade natural magnesite and its effects on the phase assemblage, microstructural evolution in correlation with mechanical and thermomechanical properties were investigated. Presence of Y2O3 facilitated the formation of calcium yttrium silicate and yttrialite phases, which prohibited the formation of detrimental‐phase monticellite, which was gradually reduced with the increase in Y2O3 content. Y2O3 promoted periclase grain growth and segregated the secondary phases at triple‐point junction of periclase grains. Also, high‐temperature (at 1200°C) flexural strength of the samples increased from 77.2 MPa (without Y2O3) to 137.45 MPa with the addition of 2 wt% Y2O3. Greater degree of direct bonding among periclase grains, compact microstructure, and uniform grain size distribution in addition to reduced amount of monticellite were responsible for the improvement in mechanical and thermomechanical properties.

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Section: Resultsmentioning

confidence: 99%

Section: Raw Materials Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improvement in thermomechanical properties of off‐grade natural magnesite by addition of Y₂O₃

Kumar

Nath

Roy

et al. 2017

Int J Applied Ceramic Tech

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“…It was reported that TiO 2 reduces the formation of low melting phases [100]. Compacted green pellets and bars of magnesite containing 0-5 wt.% TiO 2 were sintered in the temperature range of 1500-1600 • C with 2 h soaking at peak temperature.…”

Section: Magnesia Ceramicsmentioning

confidence: 99%

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

Sadik

Moudden

Bouari

et al. 2016

Journal of Asian Ceramic Societies

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One of the most important elements of furnaces, boilers and other heating units is the structure (lining), usually made of silica-alumina, basic or special refractories. The basic refractories are materials that are increasingly in demand and whose manufacturing involves necessarily the use of MgO and CaO. In this article, the description and characterization of magnesite (MgCO 3) and dolomite (Mg,Ca(CO 3) 2) and their contribution in industrial ceramics-refractories have been reviewed.

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“…In Salem magnesite, the main impurities are SiO 2 and CaO whereas in Almora magnesite, the major impurity is Fe 2 O 3 . These impurities have detrimental effects on the refractory properties at high temperature as they can form unwanted low‐melting phases like monticellite (CMS), merwinite (C 3 MS 2 ), and di‐calcium ferrite (C 2 F) which deteriorate the high‐temperature properties of the refractory …”

Section: Introductionmentioning

confidence: 99%

Effect of ZrO₂on the densification behavior and properties of Indian magnesite

Ghosh

Sinhamahapatra

Tripathi

2018

Int J Applied Ceramic Tech

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Natural magnesite is the primary source for magnesia‐based refractory materials. India has vast deposits of magnesite in Salem and Almora regions. However, due to the presence of large amount of impurities which forms low‐melting compounds at elevated temperature, its high‐temperature application is restricted. Raw magnesite was evaluated in terms of chemical analysis, differential thermal analysis, thermogravimetric analysis, and phase assemblage. Zirconia (1‐5 wt %) was added to Indian natural magnesite of Salem region to minimize the low‐melting phase formation at high temperatures. Samples were sintered in the temperature range of 1550‐1700°C. Sintered samples were characterized in terms of densification, mechanical and thermo‐mechanical properties, phase assemblage, and microstructure. It was found that the addition of zirconia reduced the formation of detrimental phases like monticellite and thereby improved the high‐temperature mechanical properties.

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Effect of titania on the microstructure evolution of sintered magnesite in correlation with its properties

Cited by 13 publications

References 12 publications

Improvement in thermomechanical properties of off‐grade natural magnesite by addition of Y₂O₃

Improvement in thermomechanical properties of off‐grade natural magnesite by addition of Y₂O₃

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

Effect of ZrO₂on the densification behavior and properties of Indian magnesite

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Effect of titania on the microstructure evolution of sintered magnesite in correlation with its properties

Cited by 13 publications

References 12 publications

Improvement in thermomechanical properties of off‐grade natural magnesite by addition of Y2O3

Improvement in thermomechanical properties of off‐grade natural magnesite by addition of Y2O3

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

Effect of ZrO2on the densification behavior and properties of Indian magnesite

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Product

Resources

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Improvement in thermomechanical properties of off‐grade natural magnesite by addition of Y₂O₃

Improvement in thermomechanical properties of off‐grade natural magnesite by addition of Y₂O₃

Effect of ZrO₂on the densification behavior and properties of Indian magnesite