Microstructure and properties of ZnO doped Li2O–Al2O3–SiO2 glass–ceramic for LTCC applications

Qing, Zhenjun; Li, Bo; Li, Yingxiang; Li, Hao; Zhang, Shuren

doi:10.1007/s10854-015-3929-8

Cited by 12 publications

(6 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the increase in Zn in A4 and A5 did not affect the crystallisation process much but disrupted other compositions that gradually altered the entire crystalline process by forming a crystalline phase variation. This observation is in agreement with another study [29], where ZnO made densi cation achievable and less porous. Besides MgO and ZnO, CaO is also useful in promoting the formation of crystalline phase [49,50] by Ca function alone or in a combination with MgO to strengthen the glassy phase [50].…”

Section: Phase Transformationsupporting

confidence: 93%

“…Whereby, the nal crystalline phase determines the performance of LAS glass-ceramic at high thermal applications. For the production of the nal crystalline phase, β-spodumene can be obtained via conventional techniques namely melt quenching, sintering and crystallisation of the mixed powder of parent glass [29]. A good quality product can be achieved using high purity starting materials of glass and melted to a higher temperature before quenching to obtain glass frit or cullet.…”

Section: Introductionmentioning

confidence: 99%

“…These additives were intended to improve the sinterability [25], induce crystallisation process [34], increase exural strength properties [24], enhance CTE properties to the smallest possible value [21,25,29] and improve thermal shock resistance [35] of the LAS glass-ceramic. Apart from the addition of oxides, the sintering temperature also plays a major role in the formation of the desired crystal phases.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of Isothermal Treatment on the Structural, Microstructure and Physical Properties of Li2O-Al2O3-SiO2 Glass-Ceramic

Lutpi

Mohamad

Abdullah

2020

Preprint

View full text Add to dashboard Cite

The present work aims to investigate the effects of isothermal treatment on the structural, microstructure and physical properties of Li2O-Al2O3-SiO2 glass-ceramic. Sintering temperature plays a major role in producing the desired lithium aluminosilicate (LAS) glass-ceramic crystalline phases. This work also aims to achieve a low thermal expansion coefficient β-spodumene (LiAlSi2O6) crystalline phase with improved density and lower porosity, which can be useful for the applications with thermal shock properties. The LAS glass-ceramic was fabricated by the melt-quenching technique at 1550 °C for 5 h before being isothermally sintered at an elevated temperature of 900 to 1200 °C for 30 min. The evolution of LAS glass-ceramic crystalline phases was identified using differential thermal analysis and the β-spodumene exothermic peak appeared at 999 °C. Based on the X-ray diffraction results, the complete transformation of β-spodumene from high-quartz solid solution (β-quartz) occurred at 1000 °C. However, the sintering temperature did not change the crystalline phase when sintered above 1000 °C, but the lattice parameter of the crystal structure was slightly altered. Moreover, it was observed that the LAS glass-ceramic grain size increased with temperature, whereby the smallest average grain size recorded (0.61 µm) for LAS glass-ceramic sintered at 1100 °C. Meanwhile, the fully densified LAS glass-ceramic at 1100 ° C was measured at 2.47 g/cm3 with 0.52% porosity. The isothermal treatment at elevated temperature indicated that sintering at 1100 °C provided a denser, less porous, and small average grain size which is preferred for thermal shock resistance applications.

show abstract

Section: Phase Transformationsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of Isothermal Treatment on the Structural, Microstructure and Physical Properties of Li2O-Al2O3-SiO2 Glass-Ceramic

Lutpi

Mohamad

Abdullah

2020

Preprint

View full text Add to dashboard Cite

show abstract

“…The decrease of A3_4 density might be due to the densification inhibition caused by the increased viscosity of glass network that can be also proven by the increase Si percentage in Figure 3. The density of all samples obtained in this study was within the range of LAS glass-ceramics density reported by other studies, 2.4-2.6 g/cm 3 [38,39], attributable to the presence of high-density spodumene as a major phase [32]. During the 1.5 h (A3_1) sintering treatment time, the LAS glass-ceramics was subjected to the first stage of sintering, where necks were formed between particles following the gradual grain growth leading to partial or incomplete densification.…”

Section: Physical Propertiessupporting

confidence: 87%

Effect of sintering treatment time on the sintering behaviour and thermal shock resistance of Li₂O-Al₂O₃-SiO₂ glass-ceramics

Lutpi

Mohamad

Abdullah

2021

Journal of Asian Ceramic Societies

View full text Add to dashboard Cite

In order to determine the correlation of flexural strength and thermal shock resistance properties, the sintering behavior of Li 2 O-Al 2 O 3 -SiO 2 (LAS) glass-ceramics at different sintering treatment times and the effect of thermal shock cycles on LAS glass-ceramics were investigated. The LAS glass-ceramics were isothermally treated at 1100°C from 1.5 to 4.5 h. Phase transformation of major crystalline of β-spodumene and minor crystalline of ZrTiO 4 revealed unchanged as sintering treatment time increased. The physical properties of LAS glass-ceramics that were sintered for 3.5 h demonstrated an increased density (2.45 g/cm 3 ) and less porosity percentage (0.62%). The prolonged sintering treatment affected the microstructure whereby the mean grain size increased from 0.55 to 0.67 µm which also demonstrated the increase of microhardness in the range between 3.90 and 5.47 GPa. The flexural strength of LAS glass-ceramics revealed an enhancement of 158 MPa when sintered for 3.5 h. The thermal shock resistance properties were assessed at 500°C from one to seven cycles via thermal shock tests. After four thermal shock cycles, LAS glass-ceramics showed an improvement of 82% of residual strength from its original strength, due to a decrease in the formation of pores and an increase in the crystallinity and percentage of β-spodumene.

show abstract

“…The transition of the crystal phase from β-quartz to spodumene started as t c increased from 3 h to 6 h (figures 2(a) and (b)). At t c = 9 h, the corresponding phase wich has a light grey polygonal structure and gets denser [36,37].…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Microwave chemical durability of an iron-rich glass-ceramic dedicated for high-level radioactive waste

Moudir¹,

Souag²,

Kamel³

et al. 2023

Mater. Res. Express

View full text Add to dashboard Cite

This study investigates the effect of crystallization time (tc) in the structure of an iron-rich glass-ceramic (GC) dedicated for high-level radioactive waste (HLW), ceramized by nucleation–crystallization treatment at 790 °C for 2 h and 950 °C, for different periods ranging from 3 to 12 h. Density, XRD, SEM, FTIR, and Microwave chemical durability results are shown. Considering all the materials, Archimedes' density is between 2.607 and 2.634 g/cm3. Both XRD and SEM analyses revealed the development of two main crystalline phases, spodumene (LiAlSi2O6) and (Zr, Ln) molybdate La2Zr3(MoO4)9, during the heat treatment. These phases regularly grow by the increase of crystallization time. They are known as radionuclides' sequestration minerals. FTIR analysis confirms the complex GCs chemical composition. The microwave chemical durability test performed on GCs crystallized at tc = 9 h was conducted to evaluate their chemical stability. The leachates of the elements: Al, Fe, Mg, Li, Mo, Na, Si, and Zr were analyzed by ICP-OES. RLi values of Al, Mg, Mo, and Zr elements representing the radioactive waste (RW), vary between 2.3218x10-8 and 2.9204x10-8 kg/m2d. For Fe and Li, were slightly lower. However, RLSi was highest reaching 1.7457x10-6 kg/m2d. The elementary percentages extracted during the dissolution test for all elements are less than 0.5 %, which makes our material chemically stable. Its resistance to such an aggressive dissolution test makes it a good candidate for the confinement of some RW elements.

show abstract

Microstructure and properties of ZnO doped Li2O–Al2O3–SiO2 glass–ceramic for LTCC applications

Cited by 12 publications

References 20 publications

Investigation of Isothermal Treatment on the Structural, Microstructure and Physical Properties of Li2O-Al2O3-SiO2 Glass-Ceramic

Investigation of Isothermal Treatment on the Structural, Microstructure and Physical Properties of Li2O-Al2O3-SiO2 Glass-Ceramic

Effect of sintering treatment time on the sintering behaviour and thermal shock resistance of Li₂O-Al₂O₃-SiO₂ glass-ceramics

Microwave chemical durability of an iron-rich glass-ceramic dedicated for high-level radioactive waste

Contact Info

Product

Resources

About

Microstructure and properties of ZnO doped Li2O–Al2O3–SiO2 glass–ceramic for LTCC applications

Cited by 12 publications

References 20 publications

Investigation of Isothermal Treatment on the Structural, Microstructure and Physical Properties of Li2O-Al2O3-SiO2 Glass-Ceramic

Investigation of Isothermal Treatment on the Structural, Microstructure and Physical Properties of Li2O-Al2O3-SiO2 Glass-Ceramic

­Effect of sintering treatment time on the sintering behaviour and thermal shock resistance of Li2O-Al2O3-SiO2 glass-ceramics

Microwave chemical durability of an iron-rich glass-ceramic dedicated for high-level radioactive waste

Contact Info

Product

Resources

About

Effect of sintering treatment time on the sintering behaviour and thermal shock resistance of Li₂O-Al₂O₃-SiO₂ glass-ceramics