Sintering behavior of Ba/Sr celsian precursor obtained from zeolite‐A by ion‐exchange method

Biesuz, Mattia; Spiridigliozzi, Luca; Marocco, Antonello; Dell’Agli, Gianfranco; Pansini, Michele

doi:10.1111/jace.15117

Cited by 11 publications

(5 citation statements)

References 59 publications

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“…Since the structure is metastable, zeolites will undergo transformations from crystal to amorphous to a new crystalline structure with increasing temperature. 8,9 Therefore, it is difficult to prepare zeolite ceramics on the premise of maintaining ordered microporous structure by conventional ceramic process. Nakahira et al 10 prepared zeolite blocks without binder by a hydrothermal hot pressing (HHP) method.…”

Section: Introductionmentioning

confidence: 99%

Zeolite ceramics with ordered microporous structure and high crystallinity prepared by cold sintering process

Shi

Zhu

et al. 2021

J. Am. Ceram. Soc.

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4A [Na 96 (Al 96 Si 96 O 384 )⋅216H 2 O] and 13X [Na 2 (Al 2 Si 3.3 O 10.6 )⋅7H 2 O] zeolite ceramics were prepared by cold sintering processes, and the physical properties were investigated together with the structure characterization. There were four primary parameters controlling the preparation process: content of NaOH, pressure, temperature, and holding time. Zeolite ceramics with the idea ordered microporous structure and high crystallinity were obtained at 393 K under 450~550 MPa with a holding time of 5 min from the solution with 20 wt% NaOH. A high compressive strength up to 60 MPa and low Young's modulus down to 76 MPa were achieved in 13X zeolite ceramics, and the present ceramics might provide potential applications in damping materials and thermal insulating materials.

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Section: Introductionmentioning

confidence: 99%

Zeolite ceramics with ordered microporous structure and high crystallinity prepared by cold sintering process

Shi

Zhu

et al. 2021

J. Am. Ceram. Soc.

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“…The thermal analyses, reported in Figure , point out the presence of an exothermic peak between ~930°C and 970°C, slightly variable with the heating rate (in the range 2‐40°C/min). To identify the position at the heating rate used in SPS cycle (100°C/min), the peak position displacement was modeled by the relationship:

\frac{T_{p}^{2}}{HR} = e^{\frac{Q}{normalR} \frac{1}{T_{p}}}

where T p is the temperature of the peak; HR, the heating rate; Q , the activation energy; and R, the universal gas constant.…”

Section: Resultsmentioning

confidence: 99%

Spark plasma sintering of alumina/yttria‐doped silicon carbide

Popolizio

Biesuz

Molinari

2020

Int J Ceramic Engine & Sci

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Silicon carbide possesses exceptional mechanical and thermal properties, but its densification by conventional sintering is often very difficult. In the present work, silicon carbide was consolidated by spark plasma sintering in the presence of alumina and yttria. The results pointed out that the use of a single oxide does not enhance the sintering kinetics significantly, while the contemporaneous addition of both oxides has a beneficial effect on densification, with a relative density increase of about 10%. Interestingly, the oxide doping allows to double the room‐temperature flexural strength.

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“…Zeolites are aluminosilicate crystals with the ordered micropore structure (pore size < 2 nm), 30–32 which are expected as a class of potential low‐ k materials 28,33 . Zeolites have an interesting characteristic, that is, their structure will change from zeolite to amorphous and finally to a new crystalline structure with increasing temperaure 34 . In the present work, based on this characteristic of zeolites, ZSM‐5 zeolite is selected to develop low‐ k microwave dielectric materials, and the variation of microwave dielectric characteristics during sintering process is determined together with the structural evolution.…”

Section: Introductionmentioning

confidence: 99%

Low‐k dielectric materials derived from ZSM‐5 zeolite

Shi,

Sun,

Zhou

et al. 2023

J Am Ceram Soc.

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Low‐k dielectric materials were prepared by sintering ZSM‐5 zeolite powder compacts at temperatures ranged 1200–1300°C, and the microwave dielectric characteristics were investigated together with the structure evolution during sintering. It was failed to obtain ZSM‐5 ceramics by high temperature sintering because the densification could never occur below the tolerable temperature and the ordered porous structure completely collapsed above the tolerable temperature. The structure changed from ZSM‐5 zeolite to SiO2‐Al2O3 glass at 1240°C, and finally to SiO2‐based cristobalite ceramics above 1275°C. A low dielectric constant (2.63‐2.78) combined with low dielectric loss (< 0.0005 at 18 GHz) and small temperature coefficient of resonant frequency (varied from ‐18.6 to ‐8.1 ppm/°C) was achieved in the present materials, and the value of dielectric loss was the lowest one achieved so far in the dielectric materials with a dielectric constant lower than 3. With the structure evolution from ZSM‐5 zeolite to SiO2‐Al2O3 glass and finally to SiO2‐based cristobalite ceramics, the dielectric constant increased from 2.27 to 2.78, while the Qf value indicated a complicated variation tendency, and the higher Qf values were achieved in the amorphous and crystalline states, while significant drop was determined in the partial amorphous state. It should be a great challenge to prepare dense zeolite ceramics without collapse of ordered porous structure, and then the ultra‐low dielectric constant materials with high Q could be expected.

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Sintering behavior of Ba/Sr celsian precursor obtained from zeolite‐A by ion‐exchange method

Cited by 11 publications

References 59 publications

Zeolite ceramics with ordered microporous structure and high crystallinity prepared by cold sintering process

Zeolite ceramics with ordered microporous structure and high crystallinity prepared by cold sintering process

Spark plasma sintering of alumina/yttria‐doped silicon carbide

Low‐k dielectric materials derived from ZSM‐5 zeolite

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