Structural origin of negative thermal expansion of cordierite honeycomb ceramics and crystal phase evolution with sintering temperature

Son, Min-A; Chae, Ki‐Woong; Kim, Jeong Seog; Kim, Shin-Han

doi:10.1016/j.jeurceramsoc.2019.02.017

Cited by 23 publications

(8 citation statements)

References 26 publications

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“…Table 3 also shows the coefficients of linear thermal expansion of NiFe 2 O 4 ‐based ceramics sintered under different temperatures. It was evident that the sintered NiFe 2 O 4 ‐based ceramics possessed negative expansion behavior (i.e., shrinking at higher temperature), mainly owing to the smaller lattice volume at higher temperature caused by the cation migration between tetrahedron and octahedron of spinel structure 36 . The coefficient of linear thermal expansion decreased from −21.32 ± 1.61 × 10 −6 K −1 at 1250°C to −15.53 ± 1.09 × 10 −6 K −1 at 1300°C and then increased to −17.31 ± 1.16 × 10 −6 K −1 at 1350°C (where a minus sign indicated shrinking).…”

Section: Resultsmentioning

confidence: 99%

“…It was evident that the sintered NiFe 2 O 4 -based ceramics possessed negative expansion behavior (i.e., shrinking at higher temperature), mainly owing to the smaller lattice volume at higher temperature caused by the cation migration between tetrahedron and octahedron of spinel structure. 36 The coefficient of linear thermal expansion decreased from −21.32 ± 1.61 × 10 −6 K −1 at 1250 • C to −15.53 ± 1.09 × 10 −6 K −1 at 1300 • C and then increased to −17.31 ± 1.16 × 10 −6 K −1 at 1350 • C (where a minus sign indicated shrinking). The variation of thermal shock resistance was in accordance with the coefficient of linear thermal expansion, confirming the important effect of coefficient of linear thermal expansion on thermal shock resistance.…”

Section: Thermal Shock Resistancementioning

confidence: 97%

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Sintering kinetics and properties of NiFe₂O₄‐based ceramics inert anodes doped with TiN nanoparticles

Zhang

2022

Int J Applied Ceramic Tech

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Sintering kinetics of NiFe 2 O 4 -based ceramics inert anodes for aluminum electrolysis doped 7 wt% TiN nanoparticles were conducted to investigate densification and grain growth behaviors. The linear shrinkage increased gradually with the increasing sintering temperature between 1000 and 1450 • C, whereas the linear shrinkage rate exhibited a broad peak. The maximum linear shrinkage rate was obtained at 1189.4 • C, and the highest densification rate was achieved at the relative density of 75.20%. Based on the pressureless sintering kinetics window, the sintering process was divided into the initial stage, the intermediate stage, and the final stage. The grain growth exponent reduced with increased sintering temperature, whereas the grain growth activation energy decreased by increasing sintering temperature and shortening dwelling time. The grain growth was mainly controlled by atomic diffusion. NiFe 2 O 4 -based ceramics possessed hightemperature semiconductor essential characteristics. The electrical conductivity of NiFe 2 O 4 -based ceramics first increased and then decreased with increasing sintering temperature, reached their maximum value (960 • C) of 33.45 S/cm under 1300 • C, mainly attributed to the relatively dense and uniform microstructure. The thermal shock resistance of NiFe 2 O 4 -based ceramic was improved by a stronger grain boundary bonding strength and lower coefficient of linear thermal expansion.

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Section: Resultsmentioning

confidence: 99%

Section: Thermal Shock Resistancementioning

confidence: 97%

Sintering kinetics and properties of NiFe₂O₄‐based ceramics inert anodes doped with TiN nanoparticles

Zhang

2022

Int J Applied Ceramic Tech

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“…Figure 10 a shows the pore size distribution of the refractory composites treated at 1200 °C. RB4 specimens show the typical pore size distribution of mullite–cordierite ceramics [ 34 , 35 , 36 , 37 , 38 , 39 ]. The finesses of the kyanite particles tended to speed up sintering and induce the formation of mullite and cordierite.…”

Section: Resultsmentioning

confidence: 99%

Controlling the Thermal Stability of Kyanite-Based Refractory Geopolymers

2021

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The present project investigated the thermal stability of cold-setting refractory composites under high-temperature cycles. The proposed route dealt with the feasibility of using fillers with different particle sizes and studying their influence on the thermo-mechanical properties of refractory geopolymer composites. The volumetric shrinkage was studied with respect to particle sizes of fillers (80, 200 and 500 µm), treatment temperature (1050–1250 °C) and amount of fillers (70–85 wt.%). The results, combined with thermal analysis, indicated the efficiency of refractory-based kyanite aggregates for enhancing thermo-mechanical properties. At low temperatures, larger amounts of kyanite aggregates promoted mechanical strength development. Flexural strengths of 45, 42 and 40 MPa were obtained for geopolymer samples, respectively, at 1200 °C, made with filler particles sieved at 80, 200 and 500 µm. In addition, a sintering temperature equal to 1200 °C appeared beneficial for the promotion of densification as well as bonding between kyanite aggregates and the matrix, contributing to the reinforcement of the refractory geopolymer composites without any sign of vitrification. From the obtained properties of thermal stability, good densification and high strength, kyanite aggregates are efficient and promising candidates for the production of environmentally friendly, castable refractory composites.

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“…Phases 13,31 The strong peak at 600 cm −1 of mullite can be assigned to an excess of [AlO 6 ] octahedral. 32,33 The peaks at 342 and 404 cm −1 of enstatite are attributed to the Mg-O stretching vibration.…”

Section: Raman Spectroscopymentioning

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%

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

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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.

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Structural origin of negative thermal expansion of cordierite honeycomb ceramics and crystal phase evolution with sintering temperature

Cited by 23 publications

References 26 publications

Sintering kinetics and properties of NiFe₂O₄‐based ceramics inert anodes doped with TiN nanoparticles

Sintering kinetics and properties of NiFe₂O₄‐based ceramics inert anodes doped with TiN nanoparticles

Controlling the Thermal Stability of Kyanite-Based Refractory Geopolymers

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

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Structural origin of negative thermal expansion of cordierite honeycomb ceramics and crystal phase evolution with sintering temperature

Cited by 23 publications

References 26 publications

Sintering kinetics and properties of NiFe2O4‐based ceramics inert anodes doped with TiN nanoparticles

Sintering kinetics and properties of NiFe2O4‐based ceramics inert anodes doped with TiN nanoparticles

Controlling the Thermal Stability of Kyanite-Based Refractory Geopolymers

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

Contact Info

Product

Resources

About

Sintering kinetics and properties of NiFe₂O₄‐based ceramics inert anodes doped with TiN nanoparticles

Sintering kinetics and properties of NiFe₂O₄‐based ceramics inert anodes doped with TiN nanoparticles