Effects of TiO2 addition on the expansion behavior of alumina–magnesia refractory castables

Yuan, Wenjie; Deng, Chengji; Zhu, Hui

doi:10.1016/j.matchemphys.2015.06.047

Cited by 32 publications

(18 citation statements)

References 27 publications

(29 reference statements)

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“…The previous work showed that the PLC value of alumina-magnesia refractory castables with 2 w/% TiO 2 addition was less than 1 %. 11 However, the PLC values of all the samples treated at 1450°C were over 3 % in this study, which indicated that MnO as a mineralizer failed to control the integral expansion behavior of the alumina-magnesia refractory castables. Figure 5 presents the variation of the bulk density and the apparent porosity for castables with different temperatures.…”

Section: Resultsmentioning

confidence: 55%

Effects of MnO additions on the properties of alumina-magnesia refractory castables

Tang¹,

Yuan²,

Shang³

2018

Mater. Tehnol.

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The long life and high efficiency of equipment in the steelmaking industry lead to tougher requirements for the properties of calcium aluminate cement-bonded alumina-magnesia refractory castables. Normally, the properties of castables are modified by adding mineralizing compounds, which are normally used to decrease the reaction temperature and accelerate the densification of castables. In this work, the influence of MnO additions on the properties of calcium aluminate, cement-bonded, aluminamagnesia castables was investigated. The phase composition of the castables with MnO additions after calcining at 1250-1450°C was identified by X-ray diffraction, and the microstructures of the castables were characterized with a scanning electron microscope. The results showed that MnO accelerated the formation of calcium hexaluminate (CA6) and spinel (MgAl2O4). Due to the higher sintering activity of the spinel and the uniform microstructure, the cold modulus of rupture (i.e., the bending strength) of the castables with MnO additions improved from 25 MPa to 34 MPa after being calcined at 1450°C for 5 h.

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Section: Resultsmentioning

confidence: 55%

Effects of MnO additions on the properties of alumina-magnesia refractory castables

Tang¹,

Yuan²,

Shang³

2018

Mater. Tehnol.

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“…From the perspective of additives, mixing a small amount of additives could improve the formation of magnesiumaluminate spinel, promote the transformation of crystals, reduce the sintering temperature, and facilitate material densification. [14][15][16] Sarkar and Bannerjee 11 reported that TiO 2 could increase the density of alumina-rich and stoichiometric spinels sintered at 1550°C. Cunha-Duncan and Bradt 17 showed that a small amount of SiO 2 impurities in raw materials did not inhibit the formation of MA refractory.…”

Section: Introductionmentioning

confidence: 99%

Properties of magnesium‐aluminate spinel derived from bauxite and magnesia

Xuan

Wang

Tian

et al. 2021

Int J Applied Ceramic Tech

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The synthesis of magnesium-aluminate spinel divided from bauxites and magnesias, the starting materials with different molar mass ratios (Al 2 O 3 : MgO) of 3, 1, and 0.6 were developed using solid-state reaction sintering at 1350-1500°C. The effects of different mass ratios and sintering temperatures on the phase composition, densification behavior, shrinkage, flexural strength, and microstructure of the synthetic materials were studied. It was found that as the relative content of bauxite decreased, the flexural strength first decreased before increasing. When n(Al 2 O 3 )/n(MgO) was 1, the spinel was the primary phase and the sample was dense. When the temperature became 1450°C, the flexural strength became maximized at 106.48 MPa.

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“…It is also applied in the production of window glass or self-cleaning glass [12] and used in a traditional way as a pigment (titanium dioxide) for the production of paper, food, plastics, cosmetics, pharmaceuticals, porcelain, paints, and enamels. Titania has also been applied as an enamel colour stabilizer [12][13][14] and, in recent years, as a sintering agent in magnesia-alumina refractories and castables [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Effect of titanium oxide addition on magnesia refractories

Kusiorowski

2020

J Aust Ceram Soc

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This work contains the results of investigations into the influence of titanium oxide (TiO 2) addition on the properties of refractory magnesia ceramics. The presented research involved adding titanium oxide in a classic way, i.e. directly to the ceramic mix. The conducted laboratory tests revealed a significant impact of this oxide on the properties of refractory materials. Addition of a small amount of TiO 2 favoured the ceramic mix sintering whereas adding a bigger amount-more than 10 wt% resulted in the formation of refractories characterised by considerable porosity and low mechanical strength. Addition of this oxide also slightly improves the corrosive resistance of refractories.

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Effects of TiO2 addition on the expansion behavior of alumina–magnesia refractory castables

Cited by 32 publications

References 27 publications

Effects of MnO additions on the properties of alumina-magnesia refractory castables

Effects of MnO additions on the properties of alumina-magnesia refractory castables

Properties of magnesium‐aluminate spinel derived from bauxite and magnesia

Effect of titanium oxide addition on magnesia refractories

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