Mechanical Properties of a Lithium Disilicate Strengthened Lithium Aluminosilicate Glass‐Ceramic

Łączka, M.; Łączka, Karolina; Cholewa‐Kowalska, Katarzyna; Kounga, Alain Brice; Appert, Christoph

doi:10.1111/jace.12780

Cited by 29 publications

(8 citation statements)

References 9 publications

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“…For example, average linear thermal expansion coefficient of β‐spodumene (LiAlSi 2 O 6 ) is only 0.9 × 10 −6 K −1 and β‐eucryptite (LiAlSiO 4 ) even has a negative average thermal expansion coefficient (–6.2 × 10 −6 K −1 ) . The low thermal expansion property of LAS have wide range of commercial and technological applications, ranging from thermal shock‐resistant stove cooktop plates, telescope mirrors, to high‐temperature furnace windows …”

Section: Introductionmentioning

confidence: 99%

Structural Origin of the Thermal and Diffusion Behaviors of Lithium Aluminosilicate Crystal Polymorphs and Glasses

Ren

2016

J. Am. Ceram. Soc.

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Lithium aluminosilicate polymorphs a-LiAlSi 2 O 6 , b-LiAlSi 2 O 6 , and the LiAlSi 2 O 6 glass have been studied comparatively using classical molecular dynamics (MD) simulations with an aim to better understand the structural origin of the different thermomechanical behaviors and lithium ion diffusion properties. The melting behaviors and structural evolution were investigated for the three phases using MD simulations. The structural features of the three simulated samples were analyzed using coordination number, pair and bond angle distributions. The results showed that b-LiAlSi 2 O 6 and the LiAlSi 2 O 6 glass had similar melting behavior, had more random short-range atomic structures, and lower densities as compared to the a-LiAlSi 2 O 6 phase, which has a more ordered and compact structure. The lithium ion diffusion behavior in a-LiAlSi 2 O 6 , b-LiAlSi 2 O 6 , and LiAlSi 2 O 6 glass and their melts are determined and compared by calculating the mean square displacements. It was found that at high temperatures, the melts of a-LiAlSi 2 O 6 , b-LiAlSi 2 O 6 , and LiAlSi 2 O 6 glass had similar diffusion properties. While at low temperatures, a-LiAlSi 2 O 6 had the lowest diffusion coefficient and highest diffusion energy barrier due to its more close-packed structure and lacking of defects to facilitate lithium ion diffusion. Both the b-LiAlSi 2 O 6 and glass show high ionic conductivity even at low temperatures. This originates from their lower density and thus relatively open structures, but slightly different diffusion mechanisms. Lithium ion diffusion in b-LiAlSi 2 O 6 is through the large available interstitial sites while that in the glass is through vacancies due to high free volume. The glass phase had slightly lower lithium ion diffusion energy barrier and higher lithium ion diffusion coefficients as compared to the b-LiAlSi 2 O 6 phase, indicating the glass phase can achieve high ionic diffusion and, in some cases, even higher than the crystalline phases with similar densities and short-range structures.

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Section: Introductionmentioning

confidence: 99%

Structural Origin of the Thermal and Diffusion Behaviors of Lithium Aluminosilicate Crystal Polymorphs and Glasses

Ren

2016

J. Am. Ceram. Soc.

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“…Where α gc denotes the calculated CTE of glass-ceramics, α g , α c1 , α c2 , α c3 , and α c4 stands for the CTE of residual amorphous phase, LiAlSi 2 O 6 (0.9 × 10 − 6 °C − 1 ) [12] , LiAlSi 3 O 8 (3 × 10 − 6 °C − 1 ) [13] , Li 2 SiO 3 (9.0 × 10 − 6 °C − 1 ) [14] , and BaAl 2 Si 2 O 8 (2.2 × 10 − 6 °C − 1 ) [15] , respectively. While the x g , x c1 , x c2 , x c3 , and x c4 represents the content of the above-mentioned phases.…”

Section: Materials Characterizationmentioning

confidence: 99%

Controlling the Phase Content of Li2O-Al2O3-SiO2-B2O3-BaO Glass-Ceramic Bonds with CTE Close to cBN

Guo

et al. 2020

Preprint

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Li2O-Al2O3-SiO2-B2O3-BaO glass-ceramic bonds with CTE close to cBN for vitrified cBN composites was prepared via a two-step heat treatment method. The crystalline phases were identified by XRD and the phase content was analyzed by WPF refinement. The increasing crystallization temperature would promote the precipitation of more LiAlSi3O8 phase in the glass-ceramic, which was conducive to the preparation of low CTE glass-ceramics. Besides, a crystallization temperature below 625 °C was necessary for the preparation of Li2O-Al2O3-SiO2-B2O3-BaO glass-ceramic with CTE close to cBN (3.50 × 10− 6 °C− 1), proving that the two-step heat treatment was an effective sintering process to the preparation of low CTE glass-ceramic bonds for vitrified cBN composites.

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“…System and is described in [8]. The experiments presented in this work were all performed in the nucleated state, reached after a 30 minutes long treatment in the furnace at 660˚C.…”

Section: Lithium Aluminosilicate Glass-ceramic Samplesmentioning

confidence: 99%

Influencing the Crystallization of Glass-Ceramics by Ultrashort Pulsed Laser Irradiation after Nucleation

Senn¹,

Holtz²,

Gross-Barsnick³

et al. 2018

NJGC

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An ultra-fast laser with central wavelength at 1064 nm and 10 ps pulse duration was used to tightly focus laser radiation with a microscope objective inside the volume of nucleated Lithium Aluminosilicate (LAS) glass-ceramic. The nonlinear absorption of the LAS glass-ceramic was measured for different laser parameters and a thermal simulation was performed to determine the temperature field inside the laser-modified area. After laser processing, the samples were crystallized in a furnace and the effect of the laser-induced modifications on the microstructure was analyzed with SEM. The SEM analysis shows an increase in the length and size of whisker-shaped β-spodumene crystals in the laser-modified area. By increasing the dimension of these whisker-shaped crystals, the flexural strength of LAS can be improved locally. First four-point bending flexural tests were performed to examine the influence on the mechanical properties.

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Mechanical Properties of a Lithium Disilicate Strengthened Lithium Aluminosilicate Glass‐Ceramic

Cited by 29 publications

References 9 publications

Structural Origin of the Thermal and Diffusion Behaviors of Lithium Aluminosilicate Crystal Polymorphs and Glasses

Structural Origin of the Thermal and Diffusion Behaviors of Lithium Aluminosilicate Crystal Polymorphs and Glasses

Controlling the Phase Content of Li2O-Al2O3-SiO2-B2O3-BaO Glass-Ceramic Bonds with CTE Close to cBN

Influencing the Crystallization of Glass-Ceramics by Ultrashort Pulsed Laser Irradiation after Nucleation

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