Microstructure and mechanical properties of nucleant-free Li2O-CaO-SiO2 glass-ceramics

Santos, Gisele G.; Serbena, Francisco Carlos; Fokin, Vladimir M.; Zanotto, Edgar Dutra

doi:10.1016/j.actamat.2017.03.010

Cited by 37 publications

(4 citation statements)

References 29 publications

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“…In a previous work conducted with glass–ceramics (GCs) of the CaO–Li 2 O–SiO 2 system, 37 we noticed that, depending on the crystallized fraction of lithium metasilicate crystals embedded in a matrix consisting of wollastonite and residual glass, spontaneous microcracks were visible inside the lithium metasilicate crystals and, as a result, the strength and K Ic decreased. Those results are an example of a system in which the inclusions (lithium metasilicate crystals) have a higher thermal expansion coefficient ( α p = 15 × 10 −6 K −1 ) than the matrix (wollastonite, α w = 6 × 10 −6 K −1 , and the residual glass, α rg = 11 × 10 −6 K −1 ).…”

Section: Resultsmentioning

confidence: 96%

Residual stress versus microstructural effects on the strength and toughness of phase‐separated PbO–B₂O₃–Al₂O₃ glasses

Santos

Peitl

Koike³

et al. 2022

J Am Ceram Soc.

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A few authors have reasonably proposed that liquid–liquid phase‐separated (LLPS) glasses could show improved fracture strength, Sf, and toughness, KIc, as the second phase could provide a barrier to crack propagation via deflection, bowing, trapping, or bridging. Due to the associated tensile or compressive residual stresses, the second phase could also act as a toughening or a weakening mechanism. In this work, we investigated five glasses of the PbO–B2O3–Al2O3 system spanning across the miscibility gap: Four of them undergo LLPS—three are binodal (two B2O3‐rich and one PbO‐rich) and one is spinodal—and one does not show LLPS (composition outside the miscibility gap). Their compositions were designed in such a way that the amorphous particles are under compressive residual stresses in some and under tensile residual stresses in others. The following mechanical properties were determined: the Vickers hardness, ball on three balls (B3B) strength, and toughness, KIc‐SEVNB (single‐edge V‐notch beam [SEVNB]). The microstructures and compositions were analyzed using scanning electron microscopy with energy‐dispersive X‐ray spectrometry. The spinodal glass showed, by far, the best mechanical properties. Its KIc‐SEVNB = 1.6 ± 0.1 MPa m1/2, which embodies an increase of almost 50% over the B2O3‐rich binodal composition, and 90% considering the PbO‐rich binodal composition. Moreover, its fracture strength, Sf = 166 ± 7 MPa, is one of the highest ones ever reported for an LLPS glass. Fracture analyses evidenced that the spinodal composition exhibited the lowest net stress at the fracture point. Moreover, calculations indicate that the internal residual stress level is the lowest in the spinodal glass. The overall results indicate that the microstructural effect of the spinodal glass is the most significant factor for its superior mechanical properties. This work corroborates the idea that LLPS provides a feasible and stimulating solution to improve the mechanical properties of glasses.

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Section: Resultsmentioning

confidence: 96%

Residual stress versus microstructural effects on the strength and toughness of phase‐separated PbO–B₂O₃–Al₂O₃ glasses

Santos

Peitl

Koike³

et al. 2022

J Am Ceram Soc.

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“…The small crystal size led to Rayleigh scattering rather than Mie scattering which is more prevalent in tissue [ 43 , 44 ]. For optical applications which require scattering agents greater than 1 µm, alternative glass compositions, such as Li 2 O-CaO-SiO 2 glass-forming system [ 45 ], can be explored to facilitate the growth of larger crystals within the glass matrix.…”

Section: Discussionmentioning

confidence: 99%

Development of a glass-based imaging phantom to model the optical properties of human tissue

Yang,

Wei,

Reineck

et al. 2023

Biomed. Opt. Express

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The fabrication of a stable, reproducible optical imaging phantom is critical to the assessment and optimization of optical imaging systems. We demonstrate the use of an alternative material, glass, for the development of tissue-mimicking phantoms. The glass matrix was doped with nickel ions to approximate the absorption of hemoglobin. Scattering levels representative of human tissue were induced in the glass matrix through controlled crystallization at elevated temperatures. We show that this type of glass is a viable material for creating tissue-mimicking optical phantoms by providing controlled levels of scattering and absorption with excellent optical homogeneity, long-term stability and reproducibility.

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“…Lithium carbonate is worth noting to serve as a poreforming additive because lithium oxide formed during firing is more reactive compared to calcium, magnesium, potassium and sodium oxides, and therefore belongs to stronger fluxes, increasing the effect of boric acid and titanium dioxide. In addition, lithium oxide reduces the vitreous phase viscosity, contributing to its uniform distribution in the material depth and penetration into the small pores and voids, and also increases its strength [18,24,25].…”

Section: Methodsmentioning

confidence: 99%

Investigation of the Properties of Lithium-Containing Ceramics Based on Low-Plastic Clay

Filippova,

Akimova,

Pikalov

et al. 2024

IIUMEJ

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Nowadays the production of construction materials and items is a multi-tonnage and actively developing production sphere. The regulatory requirements imposed on construction materials and products provide the assessment of their quality and application efficiency in construction or reconstruction of buildings and structures. The constantly increasing regulatory requirements and the limited availability of high-quality natural reserves demand the rapid development of new raw material resources. This paper presents the results of charge composition development based on low-plasticity clay, which has seen limited application due to the poor performance of items produced from it. However, certain functional additives can be introduced for producing high-quality materials. In this work, alongside lithium carbonate, the following additives have been considered: boric acid used as flux and titanium dioxide as a vitreous phase source. The lithium carbonate effect on total and open porosity, density, thermal conductivity, water absorption, frost resistance, compressive and bending strength has been studied. On the one hand lithium carbonate was found to demonstrate a pore-forming effect due to its decomposition during firing. On the other hand, lithium oxide formed during the additive decomposition facilitated the viscosity reduction of the vitreous phase during firing and its strength increase after cooling. Lithium oxide, similar to boric acid, is a flux, which makes further temperature reduction of liquid-phase sintering possible while preserving the surface self-glazing effect and the formation of the closed-pored internal structure of ceramics. The lithium carbonate pore-forming effect prevails over the flux-hardening and therefore, the amount this additive should be limited to obtain high performance properties and the compliance of resulting ceramics with regulatory requirements. The resulting ceramic material can be used for manufacturing products for buildings’ and structures’ plinth lining. ABSTRAK: Pada masa kini, pengeluaran bahan dan barangan pembinaan adalah dalam gandaan tan dan aktif dibangunkan terutama dalam bidang pengeluaran. Keperluan pengawalseliaan bahan dan produk pembinaan menyediakan aplikasi penilaian kualiti dan kecekapan pembinaan atau pembinaan semula bangunan dan struktur. Peningkatan berterusan terhadap keperluan pengawalseliaan dan ketersediaan rizab semula jadi berkualiti tinggi yang terhad menuntut kepada pembangunan pesat sumber bahan mentah baru berkembang. Kajian ini memperkenalkan hasil pembangunan komposisi caj berdasarkan tanah liat keplastikan rendah, di mana aplikasi terhad kepada keburukan bahan yang dihasilkan, namun bahan tambahan tertentu boleh diperkenalkan bagi menghasilkan bahan berkualiti tinggi. Menggunakan litium karbonat bersama bahan tambahan berikut: asid borik digunakan sebagai fluks dan titanium dioksida sebagai sumber fasa vitreus, telah diambil kira dalam kajian ini. Kesan litium karbonat pada keliangan, ketumpatan, kekonduksian terma, penyerapan air, rintangan fros, kekuatan mampatan dan lenturan telah dikaji. Litium karbonat didapati menunjukkan kesan pembentukan liang dalam proses penguraian semasa pembakaran. Sebaliknya, litium oksida dibentuk semasa penguraian aditif dan membantu dalam pengurangan kelikatan fasa vitreus semasa pembakaran dan kekuatannya meningkat selepas penyejukan. Litium oksida, serupa dengan asid borik, adalah fluks, berpotensi menyebabkan suhu sinteran terus berkurang pada fasa cecair sambil mengekalkan kesan kilauan pada permukaan kaca dan menutup pembentukan struktur liang dalaman seramik. Kesan pembentukan liang litium karbonat adalah mengatasi pengerasan fluks. Oleh itu, jumlah bahan tambah ini harus dihadkan bagi mencapai piawaian dan prestasi tinggi seramik yang terhasil. Bahan seramik yang terhasil ini boleh digunakan sebagai lapisan plint bangunan dan struktur dalam pembuatan produk.

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Microstructure and mechanical properties of nucleant-free Li2O-CaO-SiO2 glass-ceramics

Cited by 37 publications

References 29 publications

Residual stress versus microstructural effects on the strength and toughness of phase‐separated PbO–B₂O₃–Al₂O₃ glasses

Residual stress versus microstructural effects on the strength and toughness of phase‐separated PbO–B₂O₃–Al₂O₃ glasses

Development of a glass-based imaging phantom to model the optical properties of human tissue

Investigation of the Properties of Lithium-Containing Ceramics Based on Low-Plastic Clay

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Microstructure and mechanical properties of nucleant-free Li2O-CaO-SiO2 glass-ceramics

Cited by 37 publications

References 29 publications

Residual stress versus microstructural effects on the strength and toughness of phase‐separated PbO–B2O3–Al2O3 glasses

Residual stress versus microstructural effects on the strength and toughness of phase‐separated PbO–B2O3–Al2O3 glasses

Development of a glass-based imaging phantom to model the optical properties of human tissue

Investigation of the Properties of Lithium-Containing Ceramics Based on Low-Plastic Clay

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Product

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Residual stress versus microstructural effects on the strength and toughness of phase‐separated PbO–B₂O₃–Al₂O₃ glasses

Residual stress versus microstructural effects on the strength and toughness of phase‐separated PbO–B₂O₃–Al₂O₃ glasses