Effect of Cr2O3, Fe2O3 and TiO2 nucleants on the crystallization behaviour of SiO2–Al2O3–CaO–MgO(R2O) glass-ceramics

Rezvani, M.; Eftekhari-yekta, B.; Solati‐Hashjin, Mehran; Marghussian, V.K.

doi:10.1016/j.ceramint.2004.03.037

Cited by 165 publications

(67 citation statements)

References 11 publications

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“…Only polymorphic transformations are studied. Such transformations are frequently observed during bulk crystallization of metallic glasses [11][12][13][14][15]. We also consider the effects of these violations on the linear scaling relations that occur due to finite size nuclei.…”

Section: T Ktmentioning

confidence: 99%

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Avrami exponent under transient and heterogeneous nucleation transformation conditions

Sinha¹,

Mandal²

2011

Journal of Non-Crystalline Solids

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The Kolmogorov-Johnson-Mehl-Avrami model for isothermal transformation kinetics is universal under specific assumptions. However, the experimental Avrami exponent deviates from the universal value. In this context, we study the effect of transient heterogeneous nucleation on the Avrami exponent for bulk materials and also for transformations leading to nanostructured materials. All transformations are assumed to be polymorphic. A discrete version of the KJMA model is modified for this purpose.Scaling relations for transformations under different conditions are reported.

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Section: T Ktmentioning

confidence: 99%

“…On the other hand heterogeneous nucleation leads to an exponent value < 4 [8,15]. The variation of the local Avrami exponent ( ) n X value versus X for transformations initiated by heterogeneous nucleation at fixed contact angle values has been shown in reference [10].…”

Section: Heterogeneous Nucleationmentioning

confidence: 99%

Avrami exponent under transient and heterogeneous nucleation transformation conditions

Sinha¹,

Mandal²

2011

Journal of Non-Crystalline Solids

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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%

“…The compositions of the above-mentioned glass ceramics can mainly be located in the CaO-MgO-Al 2 O 3 -SiO 2 system. 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] .…”

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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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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“…4) For the SiO 2 Al 2 O 3 CaOMgO (R 2 O) system with addition of Cr 2 O 3 , Fe 2 O 3 and TiO 2 , the triple additives are more effective to induce bulk crystallization than single and/or double additives. 5) However, the diopside with co-addition of TiO 2 , V 2 O 5 and MoO 3 has not been reported yet. When TiO 2 , V 2 O 5 and MoO 3 are co-added to diopside, the relative amount of additives should be changed to obtain the optimal composition for the improvement of crystallization.…”

Section: Introductionmentioning

confidence: 99%

Effect of crystallization on thermal conductivity of diopside

Jeon

Yeo

Kim

2010

J. Ceram. Soc. Japan

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Dependence of thermal conductivity on the crystallization behavior of CaMgSi 2 O 6 glass-ceramics was investigated as a function of TiO 2 , V 2 O 5 and MoO 3 content. With the co-addition of TiO 2 , V 2 O 5 and MoO 3 , the glass transition temperature (T g ) was decreased, while the peak temperature of crystallization (T p ) was increased. The onset temperature of crystallization (T c ) was dependent on the types and amount of additives. Due to the differences of T c with additives, the crystallization behaviors such as the degree of crystallization and crystallite size of the specimens were changed. The thermal diffusivity of the specimens sintered at 900°C for 1 h was increased with the crystallite size. With increasing of the degree of crystallization, the thermal conductivity of the specimens was increased, while the temperature coefficient of thermal conductivity was decreased.

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Effect of Cr2O3, Fe2O3 and TiO2 nucleants on the crystallization behaviour of SiO2–Al2O3–CaO–MgO(R2O) glass-ceramics

Cited by 165 publications

References 11 publications

Avrami exponent under transient and heterogeneous nucleation transformation conditions

Avrami exponent under transient and heterogeneous nucleation transformation conditions

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

Effect of crystallization on thermal conductivity of diopside

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