Effects of boric acid addition and sintering temperature on the thermal conductivity of perlite-based insulation materials
MATERIALS TESTING, vol.62, no.4, pp.408-412, 2020 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 62 Issue: 4
- Publication Date: 2020
- Doi Number: 10.3139/120.111496
- Journal Name: MATERIALS TESTING
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex
- Page Numbers: pp.408-412
- Keywords: Insulation, perlite, cordierite, sepiolite, boric acid, thermal conductivity, PUMICE, CONCRETE
- Yıldız Technical University Affiliated: Yes
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.