Work

Nanocrystalline yttria‐stabilized hafnia ceramics with low thermal conductivity and enhanced mechanical properties

Year: 2025

Type: article

Abstract: ABSTRACT Hafnia‐based materials have become promising materials for thermal barrier applications above 1200°C. In this study, a series of yttria‐stabilized hafnia (YSH) ceramics (0‒20 mol% Y 2 O 3 ) were prepared by spark plasma sintering under 100 MPa. In addition, the effects of dopant content and sintering temperature on mechanical properties and thermal conductivity were investigated. YSH ceramics consisted of monoclinic and cubic phases when Y 2 O 3 dopant content ranged from 2 to 10 mol%. The 10 mol% Y 2 O 3 ‐doped HfO 2 ceramic sintered at 1300°C exhibited ultrafine grains of 370 nm, high hardness of 11.31 GPa, high fracture toughness of 2.89 MPa m 1/2 , and low thermal conductivity of 1.52 W m −1 K −1 at 1200°C. Ultrafine microstructures, lattice distortion, and interface defects largely contributed to high mechanical properties and low thermal conductivity.

Source: Journal of the American Ceramic Society

DOI: 10.1111/jace.20556

Authors: Ao Cheng, Ji Zou, Weimin Wang, Wei Ji, Zhengyi Fu

Institutions: Wuhan University of Technology, State Key Laboratory of Advanced Technology For Materials Synthesis and Processing

Language: English

Topic: Advanced ceramic materials synthesis

Subfield: Ceramics and Composites

Field: Materials Science

Domain: Physical Sciences

Open Access status: bronze

Funder: National Natural Science Foundation of China

Awards: G2306020796, G3997630619, G5145244415