High-pressure and high-temperature synthesis and study of the thermal properties of ZrW2O8/Cu composites

作者：Li, Xin; Fang, Leiming^*; Chen, Bo^*; He, Duanwei^*

来源：Physica B: Condensed Matter , 2016, 487: 37-41.

DOI：10.1016/j.physb.2016.01.024

• Zriconium tungstate
• Negative thermal expansion
• Phase transition
• High-pressure
• Metal matrix composites (MMCs)
• Thermal properties

ZrW2O8/Cu composites with high thermal conductivity and low coefficients of thermal expansion (CTE) are desired to be utilized in thermal management applications. The ZrW2O8/Cu composites were synthesized under high-pressure and high-temperature (HPHT) conditions and annealing method. We found that the thermal conductivity and CTE of the ZrW2O8/Cu composites could be controlled through suitable HPHT sintering. In addition, cyclic heating-cooling is crucial to recrystallize the composite and reduce the thermal mismatch stress to produce a composite with high thermal conductivity and a low CTE. Under HPHT (3 GPa, 500 C) conditions and annealing at 700 degrees C, the thermal conductivity and CTE of the ZrW2O8/Cu composites have been determined directly to 165 W/(m k) and 6.8 x 10(-6) K-1. Our results help to understand the structural origins of the high thermal conductivity and low CTE, and aid in designing ZrW2O8/Cu composites with improved performance.

• 出版日期2016-4-15
• 单位中国工程物理研究院核物理与化学研究所; 中国工程物理研究院; 四川大学