The influence of nano alumina additions on the coefficient of thermal expansion of a LZS glass–ceramic composition

Arcaro, Sabrina; Nieto, Marı́a Luisa; Moreno, Rodrigo; Oliveira, Antônio Pedro Novaes de

doi:10.1016/j.ceramint.2016.02.093

Cited by 14 publications

(19 citation statements)

References 15 publications

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“…The chemical composition of the milled powder (LZS parent glass) was determined by X-ray fluorescence (Philips, PW 2400, The Netherlands) and atomic absorption spectroscopy (Unican, 969, United Kingdom). Further details on the preparation and processing of the LZS frit are reported in a previous work 20,21 . The differently prepared compositions were labeled as LZS, 1An, 2.5An, and 5An, for contents of nanosized alumina of 0, 1, 2.5, and 5 vol.%.…”

Section: Methodsmentioning

confidence: 99%

“…50 =3.5 µm and surface area of 2.5 m 2 /g. More details of the milling procedure are available elsewhere 21 . The chemical composition of the milled powder (LZS parent glass) was determined by X-ray fluorescence (Philips, PW 2400, The Netherlands) and atomic absorption spectroscopy (Unican, 969, United Kingdom).…”

Section: Methodsmentioning

confidence: 99%

“…The samples were then immediately taken off and cooled to room temperature with cold air. The firing temperatures were selected based on previous work 20,21 . These works use traditional burning processes.…”

Section: Methodsmentioning

confidence: 99%

“…Furthermore, in applications involving the joining of materials, the thermal expansion requires a fairly narrow compatibility to match the shrinkage, as in glass and glass-ceramic/metal systems for hermetic seals, laser tubes, electronic devices for measuring and monitoring, sealants for solid oxide fuel cells (SOFCs), and substrates used in microelectronic packaging on LTCC technology (low temperature co-fired ceramics) [15][16][17][18][19] . In previous works 20,21 it was demonstrated that the addition of nanosized alumina in a LZS glass-ceramic matrix, produced by conventional sintering, was able to reduce the CTE significantly. This happens because of the alumina affinity with respect to lithium silicates to form β-spodumene (LiAlSi 2 O 6 ), a crystalline phase having a CTE nearly zero (0.9 x 10…”

Section: Introductionmentioning

confidence: 99%

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LZS/Al2O3 Glass-Ceramic Composites Sintered by Fast Firing

et al. 2017

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In this work, nanometric Al 2 O 3 (1-5 vol.%) particles (13 nm, 100 m 2 /g) were added to a 19.58Li 2 O•11.10ZrO 2 •69.32SiO 2 (mol%) (3.5 µm, 2.5 m 2 /g) parent glass-ceramic matrix to prepare composites with the purpose of studying the influence of Al 2 O 3 on their structure, microstructure, mechanical, thermal and electrical properties when sintered by fast firing. The parent glass-ceramic was prepared by melting and fast cooling (in water) to obtain a glass frit. The resulting glass frit was milled according to a two-step procedure consisting on a dry milling stage followed by a long wet milling step down. Each composition was wet homogenized and then dried at 110 ºC for 48 h for disaggregation. The obtained powders were uniaxially pressed (100 MPa) and compacts sintered by fast firing (175 ºC/min) between 800 and 900 ºC for 30 min. The composites, with relative densities ranging from 89% to 93%, showed zircon and β-spodumene as main crystalline phases. The hardness and Young's modulus varied from 4.5 to 6.5 GPa, and from 65 to 102 GPa, respectively. The formation of β-spodumene in the obtained composites leads to reduce the CTEs, whose values ranged from 13 to 7 x 10 -6 ºC -1 .

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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LZS/Al2O3 Glass-Ceramic Composites Sintered by Fast Firing

et al. 2017

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“…In previous work 10 it was demonstrated that the addition of nanosized alumina in a LZS glass-ceramic matrix was able to reduce the CTE significantly. This happens because of the alumina affinity with respect to lithium silicates to form b-spodumene (LiAlSi 2 O 6 ), a crystalline phase having a CTE almost zero (0.9 9 10 À6 per°C).…”

Section: Introductionmentioning

confidence: 99%

Al₂O₃ Nanoparticulate LZS Glass–Ceramic Matrix Composites for Production of Multilayered Materials

et al. 2016

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This work reports the processing steps of Al2O3 (1–5 vol%) nanoparticulate (dV.50 = 13 nm) LZS glass–ceramic matrix (19.58Li2O·11.10ZrO2·69.32SiO2, mol%, dv.50 = 3.5 μm) composites for production of multilayered materials with thermal expansion gradients obtained by tape casting. Suspensions were prepared in water to solids contents ranging from 40 to 47 vol% using ammonium polyacrylate as a deflocculant, and an acrylic copolymer and polyvinyl alcohol as binders. Optimum performance was achieved by sonication and controlling the rheological properties for every step of the process. To prepare the composites, different concentrations (1, 2.5 and 5 vol%) of nanoalumina were added to fresh, as‐prepared LZS suspensions, by changing the solid contents as required to maintain similar viscosities. Green tapes with high uniformity, without macroscopic defects and easy to handle were sintered to relative densities between 89% and 94%. Dense and homogeneous laminates with gradual composition with increasing concentrations of alumina were obtained.

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Dissolution, bioactivity behavior, and cytotoxicity of 19.58Li₂O·11.10ZrO₂·69.32SiO₂ glass–ceramic

et al. 2021

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Glass and bioactive glass–ceramic can be used in several applications. In bone growth where good bone/biomaterial adhesion was required, bioactive coatings for implants can improve bone formation. The glass and glass–ceramics of the LZS (Li2O‐ZrO2‐SiO2) system are very interesting because of their mechanical, electrical, and thermal properties. Very recently, their biological response in contact with human osteoblast has been evaluated. However, despite several initiatives, there are still no studies that systematically assess this system's bioactivity, dissolution, and cytotoxicity in vitro. This work aims to investigate the dissolution, bioactivity behavior, and cytotoxicity of LZS glass–ceramic. LZS glass–ceramics were produced from SiO2, Li2CO3, and ZrSiO4 by melting followed by quenching. The obtained glass frits were milled and uniaxially pressed and heat‐treated at 800 and 900°C and submitted to physical–chemical, structural and mechanical characterization. Their dissolution behavior was studied in Tris–HCl, while bioactivity was performed in simulated solution body fluid (SBF). The cytotoxicity test was performed using glass–ceramic in direct contact with mesenchymal stem/stromal cells (SC) isolated from human exfoliated deciduous teeth. Structural and microstructural analyzes confirmed bioactivity. The results show that it was possible to produce bioactive glass–ceramic from LZS, proven by the formation of new calcium phosphate structures such as hydroxyapatite on the surface of the samples after exposure to SBF. The SC viability test performed indicated that the materials were not cytotoxic at 0.25, 0.5, and 1.0 mg/ml. The glass–ceramic system under study is very promising for a medicinal application that requires bioactivity and/or biocompatibility for bone regeneration.

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The influence of nano alumina additions on the coefficient of thermal expansion of a LZS glass–ceramic composition

Cited by 14 publications

References 15 publications

LZS/Al2O3 Glass-Ceramic Composites Sintered by Fast Firing

LZS/Al2O3 Glass-Ceramic Composites Sintered by Fast Firing

Al₂O₃ Nanoparticulate LZS Glass–Ceramic Matrix Composites for Production of Multilayered Materials

Dissolution, bioactivity behavior, and cytotoxicity of 19.58Li₂O·11.10ZrO₂·69.32SiO₂ glass–ceramic

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The influence of nano alumina additions on the coefficient of thermal expansion of a LZS glass–ceramic composition

Cited by 14 publications

References 15 publications

LZS/Al2O3 Glass-Ceramic Composites Sintered by Fast Firing

LZS/Al2O3 Glass-Ceramic Composites Sintered by Fast Firing

Al2O3 Nanoparticulate LZS Glass–Ceramic Matrix Composites for Production of Multilayered Materials

Dissolution, bioactivity behavior, and cytotoxicity of 19.58Li2O·11.10ZrO2·69.32SiO2 glass–ceramic

Contact Info

Product

Resources

About

Al₂O₃ Nanoparticulate LZS Glass–Ceramic Matrix Composites for Production of Multilayered Materials

Dissolution, bioactivity behavior, and cytotoxicity of 19.58Li₂O·11.10ZrO₂·69.32SiO₂ glass–ceramic