Novel ZrP2O7 ceramic foams with controllable structures and ultra-low thermal conductivity. Issue 14 (November 2021)

• Record Type: Journal Article
• Authors: Li, Shiqi; Li, Yuanbing; Xu, Nana; Li, Shujing; Zhong, Ni; Fu, Chenzhen; Luo, Han; Wang, Hailu
• Is Part Of: Journal of the European Ceramic Society. Volume 41:Issue 14(2021)
• Page Start: 7233
• Page End: 7240
• Publication Date: 2021-11
• Subjects: DA dispersing agent -- FA foaming agent -- TA thickening agent -- BA binding agent -- XRD X-ray diffraction -- SEM scanning electron microscopy -- MIAPS Microimage Analysis and Process System; ZrP2O7 -- Ceramic foams -- Foam-casting -- Process parameter -- Thermal conductivity; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2021.07.004
• Languages: English
• ISSNs: 0955-2219

Abstract

Highlights: A novel ZrP2 O7 ceramic foams were prepared by foaming method. Our work fills the blank of above 60 % porosity of ZrP2 O7 ceramic. The changes of microstructure and pore structure were demonstrated. ZrP2 O7 ceramics foams has a ultra-low thermal conductivity. We control the foam ceramic structure and performance by adjust the foaming agent, the solid content and the amount of CMC added. Abstract: This study demonstrated the synthesis of novel zirconium pyrophosphate (ZrP2 O7 ) ceramic foams via a two-step method using a foam casting technique. The synthesised foams functioned as thermal insulators with a highly controllable performance. We investigated the effects of the addition of foaming and thickening agents as well as the solid content of the slurries on the slurry, mechanical properties, thermal conductivities, and microstructure of ZrP2 O7 ceramic foams. The ZrP2 O7 ceramic foams synthesised at 1473 K exhibited a porosity, compressive strength, and thermal conductivity of 75.2–89.1 %, 1.95–0.02 MPa, and 0.144–0.057 W/(m K) (298–573 K), respectively. The increase in the porosity to >60 % will facilitate applications based on the low thermal conductivities of the foams.