Effect of impurities content from minerals on phase transformation, densification and crystallization of α-cordierite glass-ceramic

Banjuraizah, Johar; Mohamad, Hasmaliza; Ahmad, Zainal Arifin

doi:10.1016/j.jallcom.2011.04.129

Cited by 23 publications

(15 citation statements)

References 14 publications

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“…It was found in Figure 3A‐D that raising crystallization temperature contributed to the formation of α cordierite. This was consistent with other studies 13,16 . Meanwhile, Figure 3 demonstrated that μ to α cordierite transformation was affected significantly by the addition of TiO 2 .…”

Section: Resultssupporting

confidence: 92%

“…However, the glass–ceramics prepared were characterized by larger CTEs in comparison with those in other works 19‐21 . This was because natural minerals usually contain a small amount of impurities such as K 2 O, Na 2 O, and Fe 2 O 3 , inevitably leading to the generation of glass phase 10,13,14,22 …”

Section: Resultsmentioning

confidence: 87%

“…Cordierite glass–ceramics from natural minerals can be prepared at a lower temperature than those from chemical oxides in high purity 11,12 . For instance, the crystallization temperature of cordierite glass–ceramics decreases by 100°C when talc and kaolin are taken as starting materials instead of pure oxides (SiO 2 , Al 2 O 3 , and MgO) 13 . A similar conclusion was drawn by Shao et al 14 In this study, natural minerals such as kaolin and talc were included as raw materials.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of cordierite glass–ceramics for bonding solar thermal transmission pipelines

Ding

et al. 2021

Int J Applied Ceramic Tech

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TiO2 was employed to develop cordierite glass–ceramics for thermal transmission pipeline binders by a melt‐quenching method. The effects of TiO2 on the phase composition, microstructure, and physical properties of glass–ceramics were studied. In addition, the thermal shock resistance of the glass–ceramics based binder was investigated. The results showed the formation of α cordierite could be increased by adding 1.0 wt% TiO2, thereby improving bending strength and decreasing the coefficient of thermal expansion. However, a 3‐5 wt% TiO2 additive resulted in massive generation of µ cordierite, which exhibited a negative effect on the above performances. After crystallization at 1000°C for 2 h, sample B1 (1 wt% TiO2 additional) displayed the best overall properties. It was demonstrated that cordierite glass–ceramics were satisfactory materials as heat transmission pipeline binders when the C2 binder (40 wt% frit, 60 wt% as‐prepared sample B1) was applied, which had a good thermal shock resistance.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of cordierite glass–ceramics for bonding solar thermal transmission pipelines

Ding

et al. 2021

Int J Applied Ceramic Tech

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“…As an alkaline earth metal oxide, CaO acts as a glass network modifier in the glass structure. Ca 2+ has a larger field strength than Si 4+ , causing the rupture of the Si-O-Si in [SiO 4 ], resulting in depolymerisation of the siloxane anion cluster in the silicate network structure into a simpler structural unit [32]. Therefore, the absorption peak near 1020 cm - ] in the glass network to promote the glass network polymerisation degree, it is difficult to compensate for the reduction of [SiO 4 ] in the network structure, therefore, the polymerisation degree of the glass network decreases as a whole.…”

Section: Structural Analysis Of the Parent Glassesmentioning

confidence: 99%

INFLUENCE OF THE CaO CONTENT IN GLASS ON THE SINTERABILITY AND PROPERTIES OF A GLASS/Al₂O₃ COMPOSITE FOR LTCC APPLICATIONS

Fan¹

2022

Ceramics - Silikaty

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In this paper, the influence of the CaO content in glass on the sintering behaviour, structure, and properties of CaO-B 2 O 3 --Al 2 O 3 -SiO 2 glass/Al 2 O 3 composites for low-temperature co-fired ceramic materials was studied. The results show that an increase in the CaO content in the glass reduces the polymerisation degree of the glass network, thereby reducing the glass viscosity and promoting the densification of the liquid phase sintering, increasing the crystallisation tendency of the material, reducing the crystallisation peak temperature and promoting the precipitation of anorthite in the material. The sintering activation energy of the glass/Al 2 O 3 first decreases and then increases, and reached a minimum in C4. The anorthite can reduce the bulk density and coefficient of the thermal expansion of the materials, and an appropriate amount of anorthite can improve the flexural strength of the material by more than 190 MPa. When the CaO content in the glass increases, the required sintering temperature for the material to achieve the maximum flexural strength is lower.

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“…Moreover, cordierite has lower sintering temperature and lower density than the alumina, it also much cheaper and can be synthesized using mineral talc and kaolin [4]. Among the three cordierite polymorph, α-phase is more preference due to it has unique properties, which are very low coefficient of thermal expansion, dielectric constant and dielectric loss, density and stable at elevated temperature [5]. Although D-cordierite is a promising material for many applications, but it is difficult to crystallize and sinter high purity D-cordierite phase at low temperature because of its sintering temperature is near to the incongruent melting point of the cordierite.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sintering Temperature on Crystallization Behavior of Cordierite synthesized from Non-Stoichiometric Formulation

Eing

Banjuraizah

et al. 2016

MATEC Web Conf.

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Abstract. Cordierite body with formulation of non-stoichiometric composition (2.5 MgO. 1.8 Al 2 O 3. 5 SiO 2 ) was synthesized using conventional techniques with standard raw materials. The sintering and crystallization behavior of the compositions was observed by Differential Thermal Analysis and Thermogravimetric Analysis (DTA/TG). The sequence of reaction and phase transformation was analyzed using X-ray Diffraction (XRD) technique and Rietveld structural refinement after sintering the samples at different temperature regarding the information from the DTA. The Scanning electron microscopy (SEM) was employed for morphology analysis. The DTA curve shows the crystallization temperature, T c occur at 1259 o C.Rietveld quantitative phase analysis results reveal that α phase Cordierite constitutes up to 96.4 wt% when the samples was sintered for 2 hours at the optimal temperature of 1375 o C. The SEM micrograph revealed that the sample was heat treated at 1375 o C obtained densified body with well alignment of crystal structure.

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Effect of impurities content from minerals on phase transformation, densification and crystallization of α-cordierite glass-ceramic

Cited by 23 publications

References 14 publications

Preparation and characterization of cordierite glass–ceramics for bonding solar thermal transmission pipelines

Preparation and characterization of cordierite glass–ceramics for bonding solar thermal transmission pipelines

INFLUENCE OF THE CaO CONTENT IN GLASS ON THE SINTERABILITY AND PROPERTIES OF A GLASS/Al₂O₃ COMPOSITE FOR LTCC APPLICATIONS

Influence of Sintering Temperature on Crystallization Behavior of Cordierite synthesized from Non-Stoichiometric Formulation

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