Crystallization behaviour in the system MgOAl2O3SiO2

Amista, P.; Cesari, M.; Montenero, A.; Gnappi, G.; Li, Luo

doi:10.1016/0022-3093(95)00451-3

Cited by 51 publications

(41 citation statements)

References 8 publications

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“…Crystallisation and microstructure of nepheline-forsterite glass-ceramics. Ceramics International, 39(2013) 2955-2966; doi: 10.1016/j.ceramint.2012.09.07240 3 devitrification of forsterite as a secondary crystalline phase in glass-ceramics belonging to different composition systems [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Crystallisation and microstructure of nepheline–forsterite glass-ceramics

Martı́n

Andreola

Barbieri

et al. 2013

Ceramics International

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This work presents the results of a study focused on the development of forsterite-nepheline glass-ceramic with the use of rice husk ash (RHA) as a silica source. The glass-ceramics were produced by a sintering process of a glassy frit formulated in the MgO-Al 2 O 3 -SiO 2 base system with the addition of B 2 O 3 and Na 2 O to facilitate the melting and pouring processes. The crystallisation study was carried out by depicting the TTT curve (Time-TemperatureTransformation). The mineralogical characterisation of the glass-ceramic materials was carried out using X-ray diffraction (XRD). The crystallisation activation energies were calculated by the Kissinger method. The results obtained show that devitrification of the RHA glass leads to a glass-ceramic material composed of nepheline (Na 2 O·Al 2 O 3 ·2SiO 2 ) and forsterite (2MgO·SiO 2 ).A study of the microstructure by scanning electron microscopy (SEM) allowed to establish the morphological evolution in both the shape and spatial arrangement of the nepheline and forsterite crystals on heating.

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Section: Introductionmentioning

confidence: 99%

Crystallisation and microstructure of nepheline–forsterite glass-ceramics

Martı́n

Andreola

Barbieri

et al. 2013

Ceramics International

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“…However, other researchers [44][45][46] found that at this temperature the amorphous phase is still present together with ␣-cordierite. Studies by Amista et al [23] found that at this temperature the amount of amorphous phase can be reduced by the addition of excess MgO in the composition. The problem of too much MgO addition is the formation of fosterite phase [23].…”

Section: Crystallization Behaviormentioning

confidence: 97%

“…The researches were carried out basically to decrease the crystallization and sintering temperature of ␣-cordierite by using various sintering aids [1,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], sol-gel method with various precursors [14,[25][26][27][28][29][30], non-hydrolytic sol-gel route [2] or using very fine particles size [31]. However, there is no report on the ability to synthesize ␣-cordierite below 1000 • C using the methods that are described above.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure of single phase and low sintering temperature of α-cordierite synthesized from talc and kaolin

Banjuraizah

Mohamad

Ahmad

2009

Journal of Alloys and Compounds

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“…Keramik cordierite dapat disintesis dari berbagai bahan baku silika mineral seperti fumed silika, kaolinite, TMOS (tetramethylortosilicate), maupun TEOS (tetraethylorthosilicate), melalui berbagai metode diantaranya, teknik reaksi padatan (solid-state reaction) [3,4], teknik sol-gel [5,6], teknik melting [7,8].…”

Section: Pendahuluanunclassified

Pengaruh Suhu Tinggi terhadap Karakteristik Keramik Cordierite Berbasis Silika Sekam Padi

Sembiring

Manurung

Karo-Karo

2009

JFA

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IntisariThis study was carried out to investigate the effect of high temperature on the functional groups, microstructure and physical characteristics of cordierite ceramics obtained from an aqueous solution of magnesium nitrate hydrate ((Mg(NO3)2.6.12H2O)), aluminium nitrate hydrate (Al(NO3)2.9.15H2O) and silica sols extracted from rice husk. The samples were sintered at temperature of 1000• C, 1200• C and 1400• C. Functional groups and microstructural characteristics of cordierite ceramics were examined by FTIR and SEM, respectivelly. FTIR study shows that the absence of the vibration bands of Na-OH, Si-OH, C-O, Si-O-Si on the samples. However, the formation of cordierite structure was dominated on this high temperature. Microstructure results confirmed the presence of irregular morphology of the solid and compact phases. In addition, the densities, shrinkage and hardness of cordierite increase significantly with increasing temperature, but porosity decreases with increasing temperature.KATA KUNCI: rice husk, cordierite, mikrostructure, sintering I. PENDAHULUANCordierite salah satu material dengan struktur silika yang bervariasi, diantaranya entatite, magnesium silicate, dengan cordierite memiliki kandungan silika paling tinggi dan stabil [1], yang secara luas telah diaplikasikan di berbagai industri seperti, industri gelas, industri keramik dan industri elektronik sebagai isolator panas dan listrik, karena memiliki kestabilan termal dan daya tahan terhadap zat kimia yang tinggi serta koefisien termal rendah [2]. Keramik cordierite dapat disintesis dari berbagai bahan baku silika mineral seperti fumed silika, kaolinite, TMOS (tetramethylortosilicate), maupun TEOS (tetraethylorthosilicate), melalui berbagai metode diantaranya, teknik reaksi padatan (solid-state reaction) [3,4], teknik sol-gel [5,6], teknik melting [7,8].Pada penelitian yang telah dilakukan terhadap karakteristik cordierite pada suhu rendah yakni 300-700• C dengan menggunakan silika sekam padi [9] menunjukkan bahwa karakteristik fungsionalitas cordierite terdiri dari Si-OH, Si-O-Al, Mg-O-Al, Na-OH, N-O, C-O dan C-H pada suhu 300• C dan 500• C, dan proses kristalisasi pembentukan cordierite melalui spinel MgAlO 2 pada suhu sintering 700• C. Sebagai tambahan, hasil analisis SEM/EDS menunjukkan bahwa mikrostruktur dengan pori dan kekerasan meningkat dengan meningkatnya suhu sintering dengan kehadiran komposisi elemen Si, Al, Mg dan O. Perubahan sifat fisis (shrinkage, porositas, densitas dan kekerasan mengalami perubahan yang signifikan pada suhu sintering 700• C. Dari penelitian awal yang dilakukan, dapat disimpulkan bahwa proses kristalisasi diantaranya pemadatan (densification), pemben- * E-MAIL: Simbiring@yahoo.com.au tukan cordierite tergantung suhu sintering dan membutuhkan energi termal yang lebih tinggi untuk mengubah struktur. Berdasarkan latar belakang yang dipaparkan di atas, untuk melengkapi informasi pembentukan cordierite maka penelitian ini dilakukan dengan tujuan untuk mempelajari pengaruh temperatur tinggi terhadap karakteristik fu...

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Crystallization behaviour in the system MgOAl2O3SiO2

Cited by 51 publications

References 8 publications

Crystallisation and microstructure of nepheline–forsterite glass-ceramics

Crystallisation and microstructure of nepheline–forsterite glass-ceramics

Crystal structure of single phase and low sintering temperature of α-cordierite synthesized from talc and kaolin

Pengaruh Suhu Tinggi terhadap Karakteristik Keramik Cordierite Berbasis Silika Sekam Padi

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