Densification and crystallization of glass powder compacts during constant heating rate sintering

Boccaccını, Aldo R.; Stumpfe, W.; Taplin, D. M. R.; Ponton, C. B.

doi:10.1016/s0921-5093(96)10394-4

Cited by 70 publications

(40 citation statements)

References 12 publications

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“…Indeed, as reported in the literature [25], [26], a reduction in the heating rate, a, considerably lowered the crystallisation onset temperature, Tx, and maximum crystallisation rate temperature, Tp. In our case, the onset temperature of the peak assigned to melting, Tif, increased slightly as the heating rate, a, decreased, presumably associated with the formation of a larger quantity of crystals.…”

Section: Effect Of the Heating Rate A On Glaze Behavioursupporting

confidence: 70%

Non-isothermal sinter-crystallisation of satin glazes: A kinetic model

Amorós

Blasco

Moreno

et al. 2018

Ceramics International

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Many materials of a glass-ceramic nature are obtained by glass particle sinter-crystallisation, whose process kinetics have been studied very little. The present study analyses the physicochemical transformations that develop during the firing of a complex commercial satin glaze (containing more than five phases), with high frit content, particularly focusing on sintercrystallisation kinetics. Glaze sintering and phase evolution were studied by hot stage microscopy (HSM) and X-ray diffraction (XRD). The glaze melting and crystallisation ranges and the kinetic parameters of the crystallisation process were determined by differential thermal analysis (DTA). Glaze sinter-crystallisation behaviour and the development of the crystal mass fractions, residual glass compositions, and effective viscosity, eff, during heating are discussed, These values were compared with the experimental effective viscosity, eff, data obtained by hot 2 stage microscopy (HSM). Both sets of results exhibited good agreement. Effective sintering viscosity, s, which is readily measurable, helps better understand the role played by the different glaze constituents and by the firing conditions in sintering, enabling more rational design of these materials.

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Section: Effect Of the Heating Rate A On Glaze Behavioursupporting

confidence: 70%

Non-isothermal sinter-crystallisation of satin glazes: A kinetic model

Amorós

Blasco

Moreno

et al. 2018

Ceramics International

View full text Add to dashboard Cite

show abstract

“…It is important to consider the rates of viscous flow sintering and crystallisation and the interaction of these processes. If crystallisation is too rapid the resulting high degree of crystallinity will hinder the low temperature sintering leading to an unacceptable amount of porosity [22,23]. On the other hand, if sintering is fully completed before crystallisation, then the final product is unlikely to differ significantly from those fabricated by other methods.…”

Section: Powder Methodsmentioning

confidence: 99%

Glass-ceramics: Their production from wastes—A Review

2006

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Glass-ceramics are polycrystalline materials of fine microstructure that are produced by the controlled crystallisation (devitrification) of a glass. Numerous silicate based wastes, such as coal combustion ash, slag from steel production, fly ash and filter dusts from waste incinerators, mud from metal hydrometallurgy, different types of sludge as well as glass cullet or mixtures of them have been considered for the production of glass-ceramics. Developments of glassceramics from waste using different processing methods are described comprehensively in this review, covering R&D work carried out worldwide in the last 40 years. Properties and applications of the different glass-ceramics produced are discussed. The review reveals that considerable knowledge and expertise has been accumulated on the process of transformation of silicate waste into useful glass-ceramic products. These glass-ceramics are attractive as building materials for usage as construction and architectural components or for other specialised technical applications requiring a combination of suitable thermo-mechanical properties.

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“…The glass particle surface energy is the driving force and the viscous flow is the kinetic path through which the surface area is reduced. However, during sintering, surface crystallization of glass particles as a concomitant process can occur and hence the sintering kinetics is retarded of even inhibited [11,25,26]. As an indication that the sintering and crystallization processes proceed independently, the difference between T x and T MS can be considered.…”

Section: A Combination Of Differential Thermal Analyses and Hot Stagementioning

confidence: 99%

“…It is preferable that densification is performed prior to the crystallization; hence these processes are independent. The quality of the obtained glassceramics material is determined by the densification of the glass powder compact [11][12][13]. Lanthanide alkaline borate glasses showed improved durability and high glass-transition temperatures, due to that these glasses can be applied as specialized hermetic candidates [14].…”

Section: Introductionmentioning

confidence: 99%