Fabrication of lightweight ZrO2 fiberboards using hollow ZrO2 fibers. Issue 7 (May 2020)

• Record Type: Journal Article
• Authors: Pang, Xu; Wang, Tianchi; Kong, Jian
• Is Part Of: Ceramics international. Volume 46:Issue 7(2020)
• Page Start: 9103
• Page End: 9108
• Publication Date: 2020-05
• Subjects: ZrO2 fiberboards -- ZrO2 hollow fibers -- Lightweight ceramics -- Porous ceramic; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.12.159
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: ZrO2 fiberboards with ultra-low densities (0.34–0.40 g/cm 3 ) were fabricated using biomorphic ZrO2 hollow fibers, which have a lower density and better thermal insulation than traditional ZrO2 solid fibers. The effects of sol binder content, sintering temperature, and proportion of solid fibers on the density, microstructure, compressive strength, linear shrinkage, and thermal conductivity of lightweight ZrO2 fiberboards were investigated. The results showed that the hollow features of biomorphic ZrO2 fibers were successfully maintained after they were made into ZrO2 fiberboards, which made them less dense and thermally conductive. The best conditions were found to be a sol binder content of 30 vol%, sintering temperature of 1400 °C, and 20 wt% sintered solid fibers to balance thermal insulation and compressive strength. The results show that the density and thermal conductivity of lightweight ZrO2 fiberboard gives it obvious advantages as a heat-insulating ceramic. Specifically, when the sintering temperature was 1400 °C, the sample had an ultra-low density of 0.34–0.40 g/cm 3, a thermal conductivity of 0.101–0.116 W/(m·K) (at 500 °C), a compressive strength of 0.05–0.24 MPa, and a linear shrinkage of 9.4–13%.