Year: 2019
Type: article
Abstract: In this study, Gd 2 Zr 2 O 7 -X TiSi 2 (X = 0, 2.5, 5 and 7.5 wt% TiSi 2 ) ceramics were synthesized by solid state reaction method at 1550 °C for 12 h in air. The influences of TiSi 2 content on the phase, microstructure, thermophysical properties, hardness and fracture toughness were investigated. Gd 2 Zr 2 O 7 - X TiSi 2 (X = 7.5 wt%) ceramic mainly consists of a defect fluorite phase; while Gd 2 Zr 2 O 7 -X TiSi 2 (X = 0, 2.5 and 5 wt% TiSi 2 ) ceramics have an ordered pyrochlore phase. In addition, the degree of structural order decreased with the increasing TiSi 2 content. The microstructure of the doped ceramic materials exhibited grain refinement. The doping of TiSi 2 decreased the thermal conductivity while improved the thermal expansion coefficient, the hardness and the fracture toughness enhanced significantly. With these improved properties, the TiSi 2 doped Gd 2 Zr 2 O 7 ceramic materials can be a very promising material for ceramic layers of thermal barrier coating.
Source: Materials Research Express
Authors: Yinqun Hua, Bochen Jiang, Ruifang Chen, Jiangdong Cao, Wenwen Shuai, Ruitao Li
Institution: Jiangsu University
Language: English
Subfield: Surfaces, Coatings and Films
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Awards: G3486004241, G5625935348, G8143939831
OpenAlex ID: W2913625575