Mechanical Properties and Thermal Stability of the High-Thermoelectric-Performance Cu2Se Compound

• DOI: 10.1021/acsami.1c12533
• Publication Date: 2021-09-14T14:13:00Z
• Authors: Jian Zhang; Cheng Zhang; Ting Zhu; Yonggao Yan; Xianli Su; Xinfeng Tang
• Keywords: Thermal Stability; Vickers hardness test

The Cu2Se compound possesses extraordinary thermoelectric performance at high temperatures and shows great potential for the application of waste heat recycling. However, a device usually undergoes mechanical vibration, and/or thermal cycling, shock in service. Therefore, properties are equal importance as performance. stability during long-term service have rarely been reported. In this study, we systematically investigated compounds synthesized by three varied methods (melting (M), self-propagating high-temperature synthesis (SHS), combination SHS ultrasonic treatment (UT)) SHS-UT under different annealing temperatures. process effectively refines grain size from 19 μm melting sample to 5 sample. density boundaries dissipates energy crack propagation; thus, greatly improved. compressive strength, bending Vickers hardness 147 MPa, 52.6 0.46 GPa, respectively, which 21.5, 16.6, 35.3% higher than those sample, respectively. Moreover, excellent is achieved prepared ultrasonication temperature below 873 K. After up K 7 days, well maintained with ZT value exceeding 1.80 further increasing 973 K, volatilization Se precipitation Cu result instability significantly deteriorated material. This work provides an avenue boosting commercial Cu2Se.