Sintering Behavior and Machinability of Phlogopite Glass Ceramics Containing Fe2O3

Khalkhali, Zahra; Hamnabard, Z.; Yekta, B. Eftekhari; Nasiri, Marzieh; Khatibi, Elahe

doi:10.1007/s11665-012-0259-3

Cited by 8 publications

(2 citation statements)

References 14 publications

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“…Glass-ceramics containing F-phlogopite have been studied taking into account their properties and potential applications, which are dependent on their highly anisotropic crystallography [2,3]. One of the attributes that have resulted in highest number of publications is their machinability [4][5][6]. Compared to other ceramics, glass-ceramics containing Fphlogopite phase can be machined by using conventional cutting tools.…”

Section: Introductionmentioning

confidence: 99%

Glass-forming ability and thermal stability of F-phlogopite-based glasses

Casasola

Pérez

Romero

2015

J Therm Anal Calorim

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This paper presents the results of a study that analyses the effect of fluorine content on glass forming ability (GFA), glass stability (GS) and preferred crystallisation mechanism for a series of glasses in the SiO 2 -Al 2 O 3 -MgO-K 2 O-F system. Three glass compositions, with fluorine contents ranging from 4.50 to 5.70 wt. %, were investigated by differential scanning calorimetry (DSC). The GS was established by estimating different parameters derived from characteristic temperatures of non-isothermal DSC curves, namely, the working range ( T TS ), reduced glass transition temperature (T gr ), Weinberg (K w ), Hrubÿ (K H ) and Lu-Liu (K LL ) parameters. The prevalent crystallisation mechanism for each glass was assessed by determining the dissimilarity in crystallisation temperature ( T p ) between fine (<63µm powder) and coarse glass samples.The estimation of glass forming ability (GFA) was based on the critical cooling rate (q c ), which is determined from the Weinberg, Hrubÿ and Lu-Liu parameters. The results point out that the compositions of these glasses result in melts with a high tendency to crystallize during cooling (q c > 120°C/min) and obtaining amorphous glasses is only possible by fast cooling of the melt.In a subsequent thermal treatment, a volume crystallization mechanism will be prevalent in the process of devitrification of these F-phlogopite based glasses. Nevertheless, the increasing on the fluorine content in the glass composition leads to a variation in the location of the first developed crystals from the internal volume of the glass particle to surface sites. The results established by DSC analyses are verified by the results obtained from field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). R. Casasola, J.M. Pérez, M. Romero, Glass forming ability and thermal stability of F-phlogopite based glasses.

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Section: Introductionmentioning

confidence: 99%

Glass-forming ability and thermal stability of F-phlogopite-based glasses

Casasola

Pérez

Romero

2015

J Therm Anal Calorim

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“…Fluorphlogopite (henceforth, F‐phlogopite) is a phyllosilicate with the empirical formula KMg 3 (Si 3 Al)O 10 F 2 , which shows a lamellar structure of trioctahedral mica . Glass‐ceramics containing F‐phlogopite have been developed for multiple applications, such as machinable materials, biomaterials, Nicalon TM fiber reinforcement, and ceramic tile glazes …”

Section: Introductionmentioning

confidence: 99%

Crystal Growth of F‐Phlogopite from Glasses of the SiO₂–Al₂O₃–MgO–K₂O–F System

2015

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A study on the devitrification of fluorophyllosilicate glass precursors is presented. The research has been focused on the early stages of the crystallization process and shows the variation in the crystallization mechanism with increasing the fluorine content. The devitrification process has been studied by means of differential scanning calorimetry (DSC) and fieldemission scanning electron microscopy (FESEM). These complementary techniques established that both surface (heterogeneous nucleation) and volume (internal homogeneous nucleation) mechanisms are present in the crystallization process of fluorophlogopite-based glasses, the latter being predominant. By increasing the percentage of fluorine in the parent glass, a variation in the location of the first crystals developed from the internal volume of the glass toward the external surface was observed. Such an alteration in the crystallization mechanism was also checked by examining the microstructure of crystallized samples prepared under short-time treatments.

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