Behavior of the refractive index of lithium disilicate glass ceramic processed at high pressure and high temperature

Buchner, Silvio; Pereira, Marcelo Barbalho; Balzaretti, Naira Maria

doi:10.1016/j.optmat.2011.11.018

Cited by 22 publications

(22 citation statements)

References 7 publications

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“…Gutzow et al [19] indicated a shift of the melt crystallization to higher temperatures should be expected when very high pressures were applied. Phase changes in lithium disilicate glass-ceramics were induced when samples were processed at pressures from 2.5 to 7.7 GPa, with monoclinic, orthorhombic and metasilicate phases crystallized at different pressures [20]. The current study used lower pressures in comparison due to the SPS set up.…”

Section: Discussionmentioning

confidence: 99%

The effect of spark plasma sintering on lithium disilicate glass-ceramics

et al. 2015

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Section: Discussionmentioning

confidence: 99%

The effect of spark plasma sintering on lithium disilicate glass-ceramics

et al. 2015

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“…The reported IPS Empress 2 Li 2 Si 2 O 5 material, with strength of 400 ± 40 MPa, has been prepared by the hot‐pressing technology . The flexural strength of ~440 MPa for Li 2 Si 2 O 5 glass‐ceramics prepared by hot‐pressing technology was also reported, which is favorable for the application as dental crown, but unfavorable for the machinability and costs of CAD/CAM or other processing. For the dental application of the Li 2 Si 2 O 5 glass‐ceramics by hot pressing, a new processing for preparing Li 2 Si 2 O 5 glass‐ceramics should be proposed by considering the machinability of metasilicate and the high strength of disilicate in the final product, which had been applied for the bulk Li 2 Si 2 O 5 glass materials in the dental crown fabrication .…”

Section: Introductionmentioning

confidence: 99%

Lithium Disilicate Glass‐Ceramics by Heat Treatment of Lithium Metasilicate Glass‐Ceramics Obtained by Hot Pressing

Zhang

et al. 2015

J. Am. Ceram. Soc.

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Lithium disilicate glass‐ceramics are widely used as dental ceramics due to their machinability and translucency. In this study, lithium disilicate glass‐ceramic was fabricated through heat treatment of lithium metasilicate glass‐ceramics obtained by hot pressing of glass powder composed of SiO2–Li2O–P2O5–ZrO2–Al2O3–K2O–CeO2 at low temperature. The crystalline phase, microstructure, and mechanical properties were investigated. The results indicated that lithium metasilicate glass‐ceramic with a relative density of higher than 99% was obtained after hot pressing, and glass‐ceramic with interlocked rod‐like Li2Si2O5 crystals and good flexural strength (338 ± 20 MPa) was successfully obtained through heat treatment. The two‐step method was believed to be feasible in tailoring the microstructure and mechanical properties of lithium disilicate glass‐ceramics.

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“…In particular, LS 2g glass has been investigated under high pressure by Fuss et al and by Buchner et al The formation of LS m was clearly confirmed by X‐ray diffraction and Raman spectroscopy after processing LS 2g glass simultaneously at high pressure and high temperature (HPHT) . In a previous work, it was shown that heat treatment of the glass at 2.5 and 4 GPa induced the crystallization of LS 2c (treatment at 455°C and 500°C for nucleation and at 610°C for crystal growth). The formation of LS m started at 4.25 GPa coexisting with quartz and coesite up to 6.5 GPa (treatment at 455°C and 500°C for nucleation and at 610°C for crystal growth) .…”

Section: Introductionmentioning

confidence: 96%

Thermal stability of lithium metasilicate produced under high pressure from lithium disilicate glass

Buchner

Kulbieda

Fokin

et al. 2019

Int J of Appl Glass Sci

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Crystalline lithium disilicate, Li 2 Si 2 O 5 (LS 2c ) is usually produced at atmospheric pressure by suitable heat treatment of the glass with the same stoichiometric composition (LS 2g ). At this pressure, the orthorhombic phase of lithium disilicate is thermodynamically stable. The heat treatment of LS 2g under high pressure (7.7 GPa) induces the crystallization of lithium metasilicate Li 2 SiO 3 (LS m ) phase, which remains metastable after pressure release. In this work, distinct heat treatments under high pressure were chosen to produce lithium metasilicate crystals with different grain sizes embedded in the glass matrix: smaller than 10 µm, about 100 µm and larger than 100 µm. Thermal stability of this set of samples was investigated during subsequent heat treatments at atmospheric pressure. All samples were analyzed by X-ray diffraction, Raman spectroscopy and optical microscopy. Small LS m crystals produced under high pressure remained detectable only up to 1 hour of heat treatment at 610°C at atmospheric pressure while for longer heating times, the formation of quartz and crystalline LS 2c was observed. On the other hand, for the samples containing larger LS m crystals produced under high pressure, the metasilicate phase remained detectable up to 9.5 hours of subsequent heat treatment, forming spherulitic configurations. K E Y W O R D Sglass-ceramic, high pressure, lithium disilicate, lithium metasilicate, thermal stability

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Behavior of the refractive index of lithium disilicate glass ceramic processed at high pressure and high temperature

Cited by 22 publications

References 7 publications

The effect of spark plasma sintering on lithium disilicate glass-ceramics

The effect of spark plasma sintering on lithium disilicate glass-ceramics

Lithium Disilicate Glass‐Ceramics by Heat Treatment of Lithium Metasilicate Glass‐Ceramics Obtained by Hot Pressing

Thermal stability of lithium metasilicate produced under high pressure from lithium disilicate glass

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