Sinter-crystallization of a glass obtained from basaltic tuffs

Karamanov, Alexander; Ergul, Sibel; Akyildiz, Mustafa; Pelino, M.

doi:10.1016/j.jnoncrysol.2007.07.040

Cited by 33 publications

(27 citation statements)

References 26 publications

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“…Glass ceramic is a generic name given to materials, which are first melted, formed into glass, and then crystallized in a controlled manner to yield nonporous polycrystalline products of unexpected properties; controlled crystallization usually involves two different stages, nucleation stage and crystallization stage [1][2][3], that in a controlled manner aims to form fine-grained uniform textures consisting of small randomly oriented crystals bonded by some residual interstitial glass without voids, micro cracks, or porosity [4,5].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of nucleated glass-ceramics based on basaltic rocks

Khater

Mahmoud

2017

J Aust Ceram Soc

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Glass-ceramics were prepared from basaltic rocks and by-pass cement dust. The effects of addition of the nucleating agents Cr 2 O 3 , ZrO 2 , and CaF 2 on crystallization, phase assemblages, and microstructure were investigated. The glasses were melted at a temperature of around 1400°C and heat-treated at 1000°C for 2 h; the produced glass was examined by DTA, while glass-ceramics was examined by XRD and SEM. The presence of Cr 2 O 3 , ZrO 2 , and CaF 2 was found to enhance and favor the crystallizability of wollastonite, quartz formation, and retarded the formation of gehlenite. Cr 2 O 3 and ZrO 2 are much better than CaF 2 in promoting homogeneous nucleation as well as in the growth of the extremely fine-grained microstructure of aluminous pyroxene, wollastonite, quartz, and magnetite with uniform crystal size that is below 50 nm in the glass containing Cr 2 O 3. Mechanical and physical properties, such as microhardness, bending strength, density, and thermal expansion coefficient of the glass have been examined. The results demonstrate that the glass-ceramics have a potential for a wide range of application, such as building materials.

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of nucleated glass-ceramics based on basaltic rocks

Khater

Mahmoud

2017

J Aust Ceram Soc

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“…There are some investigations on iron-rich glass ceramics, and the glass ceramics were mostly prepared by the sintering method and the conventional melting method [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Crystallization characteristics of iron-rich glass ceramics prepared from nickel slag and blast furnace slag

Wang

Wen

et al. 2011

Int J Miner Metall Mater

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The crystallization process of iron-rich glass-ceramics prepared from the mixture of nickel slag (NS) and blast furnace slag (BFS) with a small amount of quartz sand was investigated. A modified melting method which was more energy-saving than the traditional methods was used to control the crystallization process. The results show that the iron-rich system has much lower melting temperature, glass transition temperature (T g ), and glass crystallization temperature (T c ), which can result in a further energy-saving process. The results also show that the system has a quick but controllable crystallization process with its peak crystallization temperature at 918°C. The crystallization of augite crystals begins from the edge of the sample and invades into the whole sample. The crystallization process can be completed in a few minutes. A distinct boundary between the crystallized part and the non-crystallized part exists during the process. In the non-crystallized part showing a black colour, some sphere-shaped augite crystals already exist in the glass matrix before samples are heated to T c . In the crystallized part showing a khaki colour, a compact structure is formed by augite crystals.

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“…In fact, the sintercrystallization technique, which is an alternative technology for the production of glass-ceramics, was successfully used for synthesis of several iron-rich sintered silicate materials. [28][29][30][31] Basalts exist as compact rocks and tuffs. The rocks are formed during slow cooling of lava, resulting in high crystallinity and hardness.…”

Section: Introductionmentioning

confidence: 99%