Sintering mechanisms and dielectric properties of cold sintered (1-x) SiO2 - x PTFE composites

Arnaud Ndayishimiye, Kosuke Tsuji, Ke Wang, Sun Hwi Bang, Clive A. Randall

Research output: Contribution to journalArticle

Abstract

This study reports the sintering mechanisms of SiO2 and the relationship between structure, dielectric properties and processing of 1-xSiO2-xPTFE composites with volume fractions up to x = 0.25, prepared by the cold sintering process (270 °C, 430 MPa, 60 min). The importance of transient liquids was evaluated by using TEOS and 5 M NaOH and the densification behavior was investigated by using a semiautomated uniaxial press equipped with a dilatometer. The shrinkage behavior observed when 5 M NaOH was used highlighted the kinetics of nucleation and growth during the phase transition from amorphous silica to α-quartz. Dielectric properties (ε’ and tan δ) of cold sintered composites were studied at frequencies between 10−1 Hz and 107 Hz. For composites cold sintered with 5 M NaOH, investigations allowed to confirm the presence of PTFE polymer at the interface between two α-quartz grains by STEM EDS analysis and the presence of a dielectric relaxation at 103-104 Hz.

Original languageEnglish (US)
Pages (from-to)4743-4751
Number of pages9
JournalJournal of the European Ceramic Society
Volume39
Issue number15
DOIs
StatePublished - Dec 1 2019

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Polytetrafluoroethylene
Polytetrafluoroethylenes
Dielectric properties
Quartz
Sintering
Composite materials
Dilatometers
Dielectric relaxation
Densification
Silicon Dioxide
Energy dispersive spectroscopy
Volume fraction
Polymers
Nucleation
Phase transitions
Silica
Kinetics
Liquids
Processing

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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abstract = "This study reports the sintering mechanisms of SiO2 and the relationship between structure, dielectric properties and processing of 1-xSiO2-xPTFE composites with volume fractions up to x = 0.25, prepared by the cold sintering process (270 °C, 430 MPa, 60 min). The importance of transient liquids was evaluated by using TEOS and 5 M NaOH and the densification behavior was investigated by using a semiautomated uniaxial press equipped with a dilatometer. The shrinkage behavior observed when 5 M NaOH was used highlighted the kinetics of nucleation and growth during the phase transition from amorphous silica to α-quartz. Dielectric properties (ε’ and tan δ) of cold sintered composites were studied at frequencies between 10−1 Hz and 107 Hz. For composites cold sintered with 5 M NaOH, investigations allowed to confirm the presence of PTFE polymer at the interface between two α-quartz grains by STEM EDS analysis and the presence of a dielectric relaxation at 103-104 Hz.",
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Sintering mechanisms and dielectric properties of cold sintered (1-x) SiO2 - x PTFE composites. / Ndayishimiye, Arnaud; Tsuji, Kosuke; Wang, Ke; Bang, Sun Hwi; Randall, Clive A.

In: Journal of the European Ceramic Society, Vol. 39, No. 15, 01.12.2019, p. 4743-4751.

Research output: Contribution to journalArticle

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AU - Randall, Clive A.

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