Determination of activation energies for the crystallization of a cordierite-type glass

Rudolph, Thomas; Pannhorst, W.; Petzow, G.

doi:10.1016/0022-3093(93)91262-2

Cited by 28 publications

(22 citation statements)

References 7 publications

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“…In the present study, the above composition was reproduced using the same raw materials (mainly talc and kaolin) while another composition was produced using high purity oxides (MgO, Al 2 O 3 , and SiO 2 ). Although many studies on non-stoichiometric cordierite using reagent grade oxides as starting raw materials [1,2,[6][7][8][9][10][11] have been conducted, the processing parameters used were different and none of them used the exact same mole ratio as above. Even if the same compositions were used, the slightest difference in processing steps and processing parameters will significantly change the final properties of the bulk samples.…”

Section: Introductionmentioning

confidence: 99%

Effect of impurities content from minerals on phase transformation, densification and crystallization of α-cordierite glass-ceramic

Banjuraizah¹,

Mohamad²,

Ahmad³

2011

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Effect of impurities content from minerals on phase transformation, densification and crystallization of α-cordierite glass-ceramic

Banjuraizah¹,

Mohamad²,

Ahmad³

2011

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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“…Trace elements present due to natural precursor materials during industrial and natural cordierite formation affect the rate of reaction and the properties of the final product formed . Because of the industrial importance of these materials, there have been many studies of the kinetics of this process . Determining kinetic constants for the process using thermal methods such as DSC or DTA is difficult since separating the effects of the two stages in the crystallization is not straightforward.…”

Section: Introductionmentioning

confidence: 99%

The kinetic analysis of irreversible consecutive solid state reactions: The effect of zinc on the formation of cordierite

Clark

2017

J Am Ceram Soc

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Determination of activation energies for the crystallization of a cordierite-type glass

Cited by 28 publications

References 7 publications

Effect of impurities content from minerals on phase transformation, densification and crystallization of α-cordierite glass-ceramic

Effect of impurities content from minerals on phase transformation, densification and crystallization of α-cordierite glass-ceramic

Pengaruh Suhu Tinggi terhadap Karakteristik Keramik Cordierite Berbasis Silika Sekam Padi

The kinetic analysis of irreversible consecutive solid state reactions: The effect of zinc on the formation of cordierite

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