Effect of ZrO2 addition on strength and dilation behaviour of cordierite ceramics

Gupta, Amit; Sen, P S; Sinha, Mithilesh Kumar; Basu, Mousumi

doi:10.1007/bf00420789

Cited by 17 publications

(8 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…25 Although K 2 O content in the coffee husk ash residue can stimulate the cristobalite and spinel reaction to generate cordierite, 2 wt% addition of coffee husk ash leads to the increase of spinel fraction to 20 wt% and its thermal expansion coefficient to 4.80 × 10 −6 / • C. 14 Extra additives or fluxing agents act as impurities in cordierite, inevitably increasing the thermal expansion coefficient of cordierite ceramic. [14][15][16][17][18][19][20][21]23 The suppression and elimination of the intermediate spinel phase in cordierite synthesis without extra additives should be explored to prepare high-purity cordierite with a low thermal expansion coefficient.…”

Section: Reactionsmentioning

confidence: 99%

“…[7][8][9][10][11] However, the stable intermediate spinel phase is difficult to transform into cordierite and eliminate. 8,[12][13][14] Compared to cordierite with an extremely low thermal expansion coefficient of 1-3 × 10 −6 / • C, [15][16][17][18][19][20][21] spinel has a significantly higher thermal expansion coefficient of 9.17 × 10 −6 / • C. 15,22 Therefore, any remaining spinel phase in the cordierite ceramic product would inevitably increase the thermal expansion coefficient. When the TA B L E 1 The reactions producing spinel that have been reported in the fabrication of cordierite.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Formation, conversion, and elimination of intermediate spinel phase in MgO/kaolin mixture firing for cordierite

Yang,

Yan,

Cheng

et al. 2023

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Cordierite ceramic is usually used for diesel particulate filter owing to its excellent low thermal expansion coefficient and high thermal shock resistance properties. However, the co‐exited intermediate spinel phase can deteriorate the thermal and mechanical performances of cordierite ceramic product, because the spinel phase has much higher thermal expansion coefficient comparing to that of cordierite. In this study, two methods are utilized to reduce the spinel impurity in the cordierite ceramic. On the one hand, rational reaction resources were introduced to decrease spinel production. The formation of intermediate spinel phase is systematically researched by X‐ray diffraction (XRD), scanning electron microscopy (SEM), Raman characterizations and the results clarified the preference of path “Enstatite + Mullite → Cordierite” for less spinel production in comparison to path “Enstatite + Al2O3 → Cordierite + Spinel.” Additionally, MgO was introduced as fluxing agent to promote liquid‐phase sintering, thus facilitating the conversion of spinel. On the other hand, the sintering schedule was improved by introducing a holding temperature gradient to promote the diffusion of Si4+ and further promote the conversion of spinel into cordierite. With these methods, the residual spinel phase is minimized, the resulting high‐purity cordierite has a 47% reduction in the thermal expansion coefficient from 3.07 × 10−6/K to 1.63 × 10−6/K compared to the original cordierite sample.

show abstract

Section: Reactionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation, conversion, and elimination of intermediate spinel phase in MgO/kaolin mixture firing for cordierite

Yang,

Yan,

Cheng

et al. 2023

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…Sintering additives are generally used to stimulate sintering and to modify the microstructures and properties of ceramics. Many additives such as Li 2 O, Na 2 O, CaO, B 2 O 3 , P 2 O 5 , Fe 2 O 3 , ZnO, V 2 O 5 , TiO 2 , and ZrO 2 have been tested for the cordierite ceramic for this purpose 7–15 . Unfortunately, the increases of thermal expansion coefficient caused by many of these additives are remarkable.…”

Section: Introductionmentioning

confidence: 99%

“…Many additives such as Li 2 O, Na 2 O, CaO, B 2 O 3 , P 2 O 5 , Fe 2 O 3 , ZnO, V 2 O 5 , TiO 2 , and ZrO 2 have been tested for the cordierite ceramic for this purpose. [7][8][9][10][11][12][13][14][15] Unfortunately, the increases of thermal expansion coefficient caused by many of these additives are remarkable.…”

Section: Introductionmentioning

confidence: 99%

Sintering Additives to Eliminate Interphases in Cordierite Ceramics

Shi

2005

Journal of the American Ceramic Society

View full text Add to dashboard Cite

Effects of the sintering additives CeO2 and K2O on eliminating interphases of cristobalite and spinel were studied by means of XRD, SEM/energy‐dispersive spectrometer, and TMA techniques to obtain high cordierite contents. Adding 4 wt% CeO2 significantly stimulates the conversion of cristobalite to cordierite, depresses spinel formation and yields less glassy phase. It is helpful to prepare a ceramic with a high content of cordierite and a low thermal expansion coefficient when sintered at 1400°C for 3 h. Addition of 1–2 wt% K2O results in a large amount of glassy phase and is less effective in eliminating the interphases.

show abstract

“…As' se han utilizado aditivos que permitan disminuir la viscosidad de la fase l'quida, tales como B 2 O 3 (2-10), P 2 O 5 (2,7,8,9), CaO (11)(12)(13)(14)(15)(16)(17)(18)(19), etc., o fundentes, es decir, aditivos que permitan la disminuci-n de las temperaturas de fusi-n y densificaci-n, adem ‡s de facilitar la cristalizaci-n a temperaturas inferiores de las habituales, tales como K 2 O o Na 2 O (12,20,21). TambiŽn se ha estudiado el efecto de agentes nucleantes como TiO 2 o ZrO 2 (4,16,17,(22)(23)(24)(25)(26)(27), que favorecen la cristalizaci-n en masa frente a la cristalizaci-n superficial que es la principal causante de productos de cordierita poco densificados, as' como las variables de procesado -velocidad y tiempo de nucleaci-n y crecimiento-en la cristalizaci-n.…”

Section: Introducciînunclassified

Cristalización de Cordierita en vidrios derivados del sistema cuaternario CaO-MgO-Al2O3-SiO2. Influencia de la composición del vidrio

Vila¹,

Valentin²,

Munoz³

et al. 1998

Bol. Soc. Esp. Ceram. Vidr.

View full text Add to dashboard Cite

Se ha estudiado el efecto del calcio en la cristalizaci-n de cordierita para la obtenci-n de un material vitrocer ‡mico dentro del sistema cuaternario CaO-MgO-Al 2 O 3 -SiO 2 . Con este objetivo se han seleccionado seis composiciones dentro del campo primario de cristalizaci-n de la cordierita y se han obtenido por fusi-n sus correspondientes vidrios. Se han analizado las muestras obtenidas tras un tratamiento tŽrmico en tres etapas (transformaci-n v'trea, nucleaci-n y crecimiento) por difracci-n de rayos-X (DRX), as' como las microestructuras correspondientes a las fases cristalinas obtenidas, por microscop'a electr-nica de barrido (MEB). Las microestructuras fueron asociadas a los materiales cristalizados con la ayuda del microan ‡lisis de dispersi-n de energ'as de rayos X (DEX). La cantidad de CaO en los vidrios est ‡ directamente relacionada con la cristalizaci-n de anortita, sugiriendo la gran cantidad de anortita cristalizada en relaci-n al bajo contenido en CaO de los vidrios originales, la formaci-n de una soluci-n s-lida de anortita (CaO.Al 2 O 3 .2SiO 2 )-diopsido (MgO.CaO.2SiO 2 ), lo cual fue corroborado tambiŽn mediante MEB/DEX. A la temperatura de crecimiento, casi todas las muestras hab'an cristalizado parcialmente cordierita, ya sea como fase mayoritaria o como fase secundaria. La microestructura de la anortita se mostr-muy particulada en forma de esferolitos de un di ‡metro pr-ximo a los 500 nm, mientras la cordierita mostr-morfolog'as dispares, desde noecleos de cristalizaci-n cuasi-esferol'ticos (rosetones) de m-cordierita por cristalizaci-n directa desde el vidrio a dendritas densificadas procedentes de la transformaci-n de µ-cordierita a α-cordierita, detect ‡ndose finalmente bloques homogŽneos de α-cordierita de tama-os superiores a 10x10 µm 2 . Palabras clave: cordierita , anortita, vitrocer ‡micos, microestructura.Cordierite crystallization in glasses derived from the CaO-MgO-Al 2 O 3 -SiO 2 quaternary system. Influence of the glass composition.It has been studied the calcium effect on the crystallization of cordierite for obtaining a glassceramic material into the CaOáMgOáAl 2 O 3 áSiO 2 quaternary system. With this propose it has been selected six compositions into de cordierite primary field of crystallization and obtained the original glasses. The obtained samples have been analysed after a thermal treatment in three steps (glass transformation, nucleation and growth) by X-ray diffraction (XRD). The composition of phases in microstructures have been analysed by scanning electron microscopy (SEM). The microstructures have been related with the crystalline phases by energy dispersive X-ray microanalysis (EDX). The amount of CaO in glasses is directly related with the anorthite crystallization, suggesting that the great amount of crystallized anorthite in relation with the low amount of CaO in the original glasses is due to the formation of one anorthite-diopside solid solution, what was tested by EDX. At growth temperature almost every samples partly crystallized, as primary or secondar...

show abstract

Effect of ZrO2 addition on strength and dilation behaviour of cordierite ceramics

Cited by 17 publications

References 5 publications

Formation, conversion, and elimination of intermediate spinel phase in MgO/kaolin mixture firing for cordierite

Formation, conversion, and elimination of intermediate spinel phase in MgO/kaolin mixture firing for cordierite

Sintering Additives to Eliminate Interphases in Cordierite Ceramics

Cristalización de Cordierita en vidrios derivados del sistema cuaternario CaO-MgO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub>. Influencia de la composición del vidrio

Contact Info

Product

Resources

About