Effect of zirconia on densification and properties of natural Indian magnesite

Burhanuddin,; Kumar, Ajay; Kumar, Pawan; Ghosh, Arup; Sinhamahapatra, Somnath; Tripathi, Himansu Sekhar

doi:10.1016/j.minpro.2015.09.006

Cited by 15 publications

(11 citation statements)

References 10 publications

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“…Furthermore, EDX analysis of the samples (Figure B) shows the presence of CaO inside zirconia grains. Thus, it can be assumed that CaO is utilized by zirconia for its tetragonal stabilization …”

Section: Resultssupporting

confidence: 91%

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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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Section: Resultssupporting

confidence: 91%

“…The effect of varying amounts of zirconia addition on the physical, thermo‐mechanical, mineralogical, and microstructural properties of Indian magnesite have already been reported for Almora magnesite. They reported that zirconia reduced the liquid phase formation and altered the shape and size of the periclase grains.…”

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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“…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%

“…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, 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 . Monoclinic zirconia utilized CaO for its tetragonal‐phase stabilization and thus reduced the amount of monticellite phase .…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, high‐temperature mechanical strength of off‐grade Indian magnesite was significantly improved by adding monoclinic zirconia . Monoclinic zirconia utilized CaO for its tetragonal‐phase stabilization and thus reduced the amount of monticellite phase . Addition of rare‐earth compounds like Y 2 O 3 , CeO 2 , and Nd 2 O 3 into magnesia helped in densification process by solid solution formation, and consequently improved the properties of the magnesia …”

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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