scholarly journals Crystallisation Kinetics of aβ-Spodumene-Based Glass Ceramic

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Oscar Rubem Klegues Montedo ◽  
Dachamir Hotza ◽  
Antonio Pedro Novaes de Oliveira ◽  
Robert Meszaros ◽  
Nahum Travitzky ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Sintering Temperature ◽  
Glass Ceramics ◽  
Potential Candidate ◽  
Electronic Components ◽  
Scanning Electronic Microscopy ◽  
Multilayered Structures ◽  
Crystallisation Kinetics ◽  
Avrami Parameter ◽  
Kinetics Of

LZSA (Li2O-ZrO2-SiO2-Al2O3) glass ceramic system has shown high potential to obtain LTCC laminate tapes at low sintering temperature (<1000°C) for several applications, such as screen-printed electronic components. Furthermore, LZSA glass ceramics offer interesting mechanical, chemical, and thermal properties, which make LZSA also a potential candidate for fabricating multilayered structures processed by Laminated Objects Manufacturing (LOM) technology. The crystallization kinetics of an LZSA glass ceramic with a composition of 16.9Li2O⋅5.0ZrO2⋅65.1SiO2⋅8.6Al2O3was investigated using nonisothermal methods by differential thermal analysis and scanning electronic microscopy. Apparent activation energy for crystallization was found to be in the 274–292 kJ⋅mol−1range, and an Avrami parameternof 1 was obtained that is compared very favorably with SEM observations.

Crystallisation kinetics of mullite glass-ceramics obtained from alumina–silica wastes

2013 ◽  
Vol 6 (1) ◽  
pp. 74-81 ◽  
Author(s):  
A. Francis ◽  
S. Vilminot
Keyword(s):  
Glass Ceramics ◽  
Crystallisation Kinetics ◽  
Kinetics Of

Effects of the Sintering Temperature on Structural and Bioactivity in BaFe12O19-P2O5-CaO-Na2O Bioactive Glass Ceramic

2015 ◽  
Vol 804 ◽  
pp. 147-150
Author(s):  
Pratthana Intawin ◽  
Kamonpan Pengpat ◽  
Wilaiwan Leenakul ◽  
Tawee Tunkasiri
Keyword(s):  
Mechanical Properties ◽  
Bioactive Glass ◽  
Glass Ceramic ◽  
Sintering Temperature ◽  
Glass Ceramics ◽  
Microstructural Properties ◽  
Hardness Testing ◽  
X Ray Diffraction ◽  
X Ray

In this research, the effects of sintering temperatures on structural and bioactivity in BaFe12O19 (BF) /P2O5-CaO-Na2O bioactive glass ceramics were investigated. The BF/P2O5-CaO-Na2O bioactive glass ceramics were fabricated under various sintering temperatures in a range of 550-700 oC. X-ray diffraction (XRD) technique and the scanning electron microscopy (SEM) are used to characterize phase and microstructure. The studied samples were evaluated for mechanical properties by hardness testing. Moreover, the bioactivities of studied samples were studied by using simulated body fluid (SBF) in vitro. It was found that, the sintering temperatures are the most influential parameter on microstructure and mechanical properties of the bioactive glass ceramics. The highest density of studied ceramics was found in the sample sintered at 700 oC. The microstructural properties of the studies samples were investigated and the results were then correlated with the characteristics of sintering temperature as well as the microstructure of the bioactive glass ceramic. Moreover, the covering of bone-like apatite layer on the surface sample after a 7 day immersion in SBF suggested that the BF/P2O5-CaO-Na2O glass ceramics have acceptable bioactivities.

Microwave Dielectric Properties and its Compatibility with Silver of Glass-Ceramic Based on Co-Fire at Low Temperature

2013 ◽  
Vol 704 ◽  
pp. 167-172
Author(s):  
Hui Shao ◽  
Gang Jian
Keyword(s):  
Dielectric Properties ◽  
Low Temperature ◽  
Glass Ceramic ◽  
Sintering Temperature ◽  
Glass Ceramics ◽  
Microwave Dielectric Properties ◽  
Metal Electrode ◽  
Structural Development ◽  
Microwave Dielectric ◽  
Lower Temperature

Low temperature co-fired glass-ceramic-Ag metal electrode systems were investigated in relation to Ag diffusion and micro structural development during firing. Sintering temperature was in a range of 800°C-900°C. At lower temperature of 800°C, Ag ion was diffused through in the LTCC substrates. However, Ag diffusion was not observed at 850°C below. Simultaneously, the densification of the electrode was greatly improved. With increasing sintering temperature, glass-ceramic to the electrode does not occur due to increase of the densification of the sample. The glass-ceramics exhibited good dielectric properties: εr=7.74, tanδ=0.7×10-3 at 850°C for 0.5h.

Characterisation and crystallisation kinetics of glass ceramics developed from Erdemir blast furnace slags containing Cr2O3and TiO2nucleants

2009 ◽  
Vol 108 (1) ◽  
pp. 57-66 ◽  
Author(s):  
Z. E. Erkmen ◽  
E. Çataklı ◽  
Lütfi M. Öveçoğlu
Keyword(s):  
Blast Furnace ◽  
Glass Ceramics ◽  
Crystallisation Kinetics ◽  
Kinetics Of

scholarly journals In vitro evaluation of bioactivity of SiO2-CaO-P2O5-Na2O-CaF2-ZnO glass-ceramics

2014 ◽  
Vol 32 (3) ◽  
pp. 364-374 ◽  
Author(s):  
Madeeha Riaz ◽  
Rehana Zia ◽  
Farhat Saleemi ◽  
Farooq Bashir ◽  
Tousif Hossain ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Glass Ceramics ◽  
Surface Reactivity ◽  
Ion Concentration ◽  
Apatite Crystal ◽  
Human Blood Plasma ◽  
Potential Candidate ◽  
Essential Condition ◽  
Prepared Glass

AbstractZinc is an essential trace element that stimulates bone formation but it is also known as an inhibitor of apatite crystal growth. In this work addition of ZnO to SiO2-CaO-P2O5-Na2O-CaF2 glass-ceramic system was made by conventional melt-quenching technique. DSC curves showed that the addition of ZnO moved the endothermic and exothermic peaks to lower temperatures. X-ray diffraction analysis did not reveal any additional phase caused by ZnO addition and showed the presence of wollastonite and hydroxyapatite crystalline phases only in all the glass-ceramic samples. As bio-implant apatite forming ability is an essential condition, the surface reactivity of the prepared glass-ceramic specimens was studied in vitro in Kokubo’s simulated body fluid (SBF) [1] with ion concentration nearly equal to human blood plasma for 30 days at 37 °C under static condition. Atomic absorption spectroscopy (AAS) was used to study the changes in element concentrations in soaking solutions and XRD, FT-IR and SEM were used to elucidate surface properties of prepared glass-ceramics, which confirmed the formation of HCAp on the surface of all glass-ceramics. It was found that the addition of ZnO had a positive effect on bioactivity of glass-ceramics and made it a potential candidate for restoration of damaged bones.

Roll Pressed LZSA Glass-Ceramics

2006 ◽  
Vol 45 ◽  
pp. 442-446 ◽  
Author(s):  
G.M. Reitz ◽  
Oscar R.K. Montedo ◽  
Orestes Estevam Alarcon ◽  
Dachamir Hotza ◽  
A. P. Novaes de Oliveira
Keyword(s):  
Particle Size ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Ceramic Materials ◽  
Particle Size Analysis ◽  
Modulus Of Rupture ◽  
Size Analysis ◽  
Potential Candidate ◽  
Laser Scattering ◽  
Glass Powders

This work reports some experimental results regarding to a Li2O-ZrO2-SiO2-Al2O3 (LZSA) sintered glass-ceramic material obtained by roll pressing of glass powders (mean particle size ≈ 5 μm) with an added (7 wt.%) inorganic material (bentonite) as binder. The composition was characterized using chemical analysis, laser-scattering particle size analysis, DTA, XRD, thermal expansion, modulus of rupture (MOR) and deep abrasion (DA) measurements as well as density measurements and SEM observations. From the results it was verified that the glass-ceramic materials obtained by sintering and controlled crystallization, in the 850-1030°C temperature range, of glass powders, have properties and characteristics decisively better than those of other traditionally used materials. It is concluded that roll pressing technology is a potential candidate to produce sintered glassceramics for many applications, such as, for example, large sheets panels for electrical and thermal insulation.

scholarly journals Preparation, Microstructure and Electrical Conductivity of LATP/LB Glass Ceramic Solid Electrolytes

2021 ◽  
Vol 2101 (1) ◽  
pp. 012081
Author(s):  
Jiajia Luo ◽  
Yang Zhong ◽  
Guohua Chen
Keyword(s):  
Glass Ceramic ◽  
Solid Electrolytes ◽  
Room Temperature ◽  
Sintering Temperature ◽  
Glass Ceramics ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Ac Impedance Spectroscopy ◽  
X Ray ◽  
Grain Sizes

Abstract The Li2O-Al2O3-TiO2-P2O5 system glass ceramic solid electrolytes were prepared by adding Li3BO3 (LB) frits. The phase composition, microstructure and electrical properties of glass ceramics were investigated by using X-ray diffraction, scanning electron microscopy and AC impedance spectroscopy. The results show that the principal crystalline phase of all glass ceramic samples was LiTi2(PO4)3. The grain sizes of glass ceramic sample increase with the increase of sintering temperature. When the additive amount of LB is 1wt %, the glass ceramic solid electrolyte sintered at 950 oC shows the highest room-temperature ionic conductivity of 1.9×10−4 S.cm−1, which can be expected to be used in solid-state lithium-ion batteries.

Fabrication of Ba-Ti-B-Si-O Glass-Ceramics for LTCC

2007 ◽  
Vol 336-338 ◽  
pp. 1853-1855
Author(s):  
Xue Min Cui ◽  
Ji Zhou ◽  
Bo Li ◽  
Jian Hong Shen ◽  
Yue Hui Wang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Glass Ceramic ◽  
Sintering Temperature ◽  
Glass Ceramics ◽  
Experimental Results ◽  
Composite Method

This paper studied the dielectric performances and microstructure of the Ba-Ti-B-Si-O glass-ceramics fabricated with different methods. The experimental results showed that the pre-calcined method was an effective way to decrease the sintering temperature in glass-ceramic fabricating process, and the dielectric properties of the LTCC materials were εr ≈10, tanδ ≤ 2×10-3 (@1MHz). This study provided a composite method to fabricate LTCC for different applications that was composed of pre-calcined powders and molten powders with different ratios; Moreover, the dielectric constant and sintering performance of composite LTCC were adjustable by changing the ratio of pre-calcined powders and molten powders.

Sinter-crystallisation kinetics of a SiO–AlO–CaO–MgO–SrO glass-ceramic glaze

2020 ◽  
Vol 532 ◽  
pp. 119900 ◽  
Author(s):  
J.L. Amorós ◽  
E. Blasco ◽  
A. Moreno ◽  
N. Marín ◽  
C. Feliu
Keyword(s):  
Glass Ceramic ◽  
Crystallisation Kinetics ◽  
Ceramic Glaze ◽  
Kinetics Of
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