Thermal conductivities of alkali–silicate and calcium–alkali–silicate melts

Tsuyoshi Nishi, Katsuya Ohnuma, Kento Tanaka, Takumi Manako, Yoshifumi Yamato, Hiromichi Ohta, Sohei Sukenaga, Hiroyuki Shibata, Toshiaki Kakihara

Research output: Contribution to journalArticlepeer-review

Abstract

Thermal conductivities of alkali–silicate (R 2 O–SiO 2 (R = Li, Na, K)) and calcium–alkali–silicate (CaO–R 2 O–SiO 2 (R = Li, Na, K)) melts were evaluated by combining their thermal effusivities measured using the front-heating front-detection laser flash method with their density and specific heat capacity. Results of the evaluation revealed that the temperature-dependences of the thermal conductivities of the R 2 O–SiO 2 and CaO–R 2 O–SiO 2 (R = Li, Na, K) melts are small over the temperature range investigated. Moreover, the thermal conductivities of the CaO–R 2 O–SiO 2 melts are almost equal to those of the R 2 O–SiO 2 melts. Therefore, the network frame of the CaO–R 2 O–SiO 2 melts can presumably become dense owing to the ion bonding between Ca 2+ and the non-bridging oxygen.

Original languageEnglish
Pages (from-to)36-40
Number of pages5
JournalJournal of Non-Crystalline Solids
Volume511
DOIs
Publication statusPublished - 2019 May 1

Keywords

  • Alkali silicate
  • Calcium alkali silicate
  • Front-heating front-detection laser flash method
  • Thermal conductivity
  • Thermal effusivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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