Effects of boric acid addition and sintering temperature on the thermal conductivity of perlite-based insulation materials


PALACI Y.

MATERIALS TESTING, vol.62, no.4, pp.408-412, 2020 (Journal Indexed in SCI) identifier

  • Publication Type: Article / Article
  • Volume: 62 Issue: 4
  • Publication Date: 2020
  • Doi Number: 10.3139/120.111496
  • Title of Journal : MATERIALS TESTING
  • Page Numbers: pp.408-412

Abstract

In this study, the variation of thermal conductivity and density of 15 wt.-% boric acid - 85 wt.-% sepiolite, 30 wt.-% boric acid - 30 wt.-% sepiolite 40 wt.-% perlite, 30 wt.-% boric acid - 30 wt.-% cordierite - 40 wt.-% perlite and 30 wt.-% boric acid - 30 wt.-% alumina - 40 wt.-% perlite compositions at 700 degrees C and 900 degrees C sintering temperatures were investigated. The results show that increasing the amount of boric acid and decreasing the sintering temperature lead to an improvement in thermal insulation properties. There is a direct relation between the thermal conductivity and density of the specimens. Both physical properties change with a change in the sintering temperature and the composition characteristics. Minimum thermal conductivity has been observed in a specimen consisting of 30 wt.-% boric acid - 30 wt.-% alumina - 40 wt.-% perlite.