Influence of Cr2O3, LiF, CaF2 and TiO2 nucleants on the crystallization behavior and microstructure of glass-ceramics based on blast-furnace slag

Khater, G.A.

doi:10.1016/j.ceramint.2011.03.011

Cited by 117 publications

(32 citation statements)

References 16 publications

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“…The results confirm that the crystallization peak temperature, T p decreases firstly, and then increases with the increase of TiO 2 content. According to some investigators [7,10,12] , Ti 4+ ions remain 4-fold coordination in super cooled process. But this network is in the metastable state, a heat treatment may lead it to depolymerize, and Ti 4+ will get off from the network to reach a 6-fold coordination structure [TiO 6 ].…”

Section: Effect Of Tio 2 On Crystallization Kineticsmentioning

confidence: 99%

“…Many investigators have studied the crystallization process in this glass system and indicated that one of the main difficulties is to induce internal nucleation and bulk crystallization in the parent glass [7][8][9] . According to some researchers, TiO 2 is one of the most recommended oxides to induce effective bulk crystallization in the glasses of CaO-MgO-Al 2 O 3 -SiO 2 system and related glass systems [10][11][12] . The conventional method for producing glass ceramics in CaO-MgO-Al 2 O 3 -SiO 2 system is a two-step heat treatment, namely, a nucleation and a crystallization stage.…”

Section: Introductionmentioning

confidence: 99%

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Effect of TiO2 on crystallization of the glass ceramics prepared from granite tailings

Cheng

Kang

Lou

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The effect of TiO 2 on the crystallization behaviors of the glass ceramics prepared from granite tailings was investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD), and fi eld emission scanning electron microscopy (FESEM). The results showed that the crystallization peak temperature decreased fi rstly, and then increased with the increase of TiO 2 content. The optimum addition amount of TiO 2 was 8 wt%. With a single-step heat treatment at 924 ℃ for 1 h, augite precipitated as the only crystalline phase both on the surface and in the interior. The avrami parameter of the sample was 3.25, suggesting a twodimensional crystallization mechanism. The activation energies for phase separation and crystallization of augite were 321.75 and 698.83 kJ/mol, respectively.

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Section: Effect Of Tio 2 On Crystallization Kineticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of TiO2 on crystallization of the glass ceramics prepared from granite tailings

Cheng

Kang

Lou

et al. 2015

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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“…Thus, the dried PS (the main components are CaF 2 , Fe 2 O 3 and Cr 2 O 3 ) can be obtained. In the glass-ceramics industry, CaF 2 is widely used to decrease the crystallization temperature of the parent glass by replacing the strong Si-O linkage with a weak Si-F pair [22,26,27]. The presence of Cr 2 O 3 benefits the formation of fine-grained bulk crystallization in the glass matrix [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…Generally, the properties of glass-ceramics are defined by the chemical composition, microstructure and crystal [18]. Therefore, it is necessary to add some nucleation agents, such as pure CaF 2 , Fe 2 O 3 and Cr 2 O 3 into the formulations to improve the crystallization and mechanical properties of glass-ceramics in most cases [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Treatment method of hazardous pickling sludge by reusing as glass–ceramics nucleation agent

et al. 2015

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Heavy metal containing pickling sludge (PS) is one of the by-products of the stainless-steel-making industry, which has been considered hazardous due to contained chromium and nickel. Traditional methods of PS disposing are landfill and cement solidification. This research is aimed at disposing PS by solidification/stabilization and reusing it as a nucleation agent of glass-ceramics. The crystallization behavior and the properties of a glass in the CaO-MgO-SiO 2 -Al 2 O 3 system were studied by considering PS as the nucleation agent. Experimental results confirm that introducing 14 wt% PS as the nucleation agent of glass-ceramics can decrease crystallization temperature by 110.8°C, refine the grain size by forming isometric crystals with size of 2 lm, enhance Vickers hardness by 2690 MPa and decrease water absorption from (1.21 ± 0.10) wt% to (0.04 ± 0.01) wt%. Therefore, it is reasonable to conclude that PS can be utilized as a nucleation agent to improve the crystallization and mechanical properties of the glass-ceramics. The testing results of US EPA toxicity characteristic leaching procedure (TCLP) confirm the safety of this reusing method.

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“…In recent years, coal combustion ash [4,5], blast furnace slag [6,7], fly ash and filter dusts from waste incinerators [8][9][10], mud from metal hydrometallurgy [11,12], different types of sludge [13,14] and other industrial wastes [15,16] have been used for the preparation of glass ceramics. Khater [17] has reported that glass ceramics based on 56.78 % blast furnace slag were prepared by mixing quartz sand, dolomite, limestone and clay as other batch constituents. The glass ceramics obtained from vitrified sewage sludge have been studied by Bernardo and Dal Maschio [18], and the sample features good mechanical properties and a negligible release of heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Air Quenched Steel Slag in Decorative Ceramics with Higher Mechanical Properties

Shen¹,

Ge²,

Lv³

et al. 2017

Proceedings of the 3rd Annual International Conference on Advanced Material Engineering (AME 2017)

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Abstract. Air quenched steel slag is much more difficult to utilize than other kinds of steel slag. 50 % percent of air quenched steel slag was used to prepare brown decorative ceramics. Due to the broken (SiO4)n glass network, the optimum sintering temperature decreases with increasing Na2O and MgO, respectively. The major crystalline phase of the samples is diopside (CaMgSi2O6) with minor anorthite phase (CaAl2Si2O8). Due to remelted glass phase, the X-ray diffraction intensity of the samples decreases with increasing Na2O, while the intensity increases with increasing MgO which is beneficial to crystallization of the samples. The bending strength of the samples decreases with increasing Na2O (from 155.3+/-2.49 MPa to 143.1+/-2.01 MPa), while the strength increases with increasing MgO (from 147.4+/-3.44 MPa to 169.4+/-4.04 MPa). The Vickers hardness of the samples shows similar trends with the bending strength. The samples exhibit much better mechanical properties than marble, granite, tile and other similar ceramics reported, and present good chemical resistance. Therefore, The ceramics based on air quenched steel slag may have great potential for applications as building decorative materials, and it provides a promising way for the utilization of air quenched steel slag. IntroductionSteel slag is a kind of intractable industrial waste, which is produced as a byproduct from either the conversion of iron to steel in basic oxygen furnace, or the melting of scrap in electric arc furnace. The chemical composition of steel slag is highly variable depending on the raw materials and production process, and the utilization of steel slag is difficult [1,2]. According to different cooling methods, air cooled steel slag, water quenched steel slag, water sprayed steel slag, air quenched steel slag, etc. are obtained respectively during the cooling process of molten slag. Since air quenched steel slag is very hard, and much more difficult to be ground than air cooled, water quenched or water sprayed steel slag, the utilization of air quenched steel slag is more difficult [3]. So far, there have been no effective ways for largely utilization of air quenched steel slag.Air quenched steel slag contains calcium oxide, silicon dioxide, magnesium oxide and so on, which are the important component of glass ceramics. In recent years, coal combustion ash [4,5], blast furnace slag [6,7], fly ash and filter dusts from waste incinerators [8][9][10], mud from metal hydrometallurgy [11,12], different types of sludge [13,14] and other industrial wastes [15,16] have been used for the preparation of glass ceramics. Khater [17] has reported that glass ceramics based on 56.78 % blast furnace slag were prepared by mixing quartz sand, dolomite, limestone and clay as other batch constituents. The glass ceramics obtained from vitrified sewage sludge have been studied by Bernardo and Dal Maschio [18], and the sample features good mechanical properties and a

show abstract

Influence of Cr2O3, LiF, CaF2 and TiO2 nucleants on the crystallization behavior and microstructure of glass-ceramics based on blast-furnace slag

Cited by 117 publications

References 16 publications

Effect of TiO2 on crystallization of the glass ceramics prepared from granite tailings

Effect of TiO2 on crystallization of the glass ceramics prepared from granite tailings

Treatment method of hazardous pickling sludge by reusing as glass–ceramics nucleation agent

Utilization of Air Quenched Steel Slag in Decorative Ceramics with Higher Mechanical Properties

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