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

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• 作者：Xin Li^a ; ^b ; Leiming Fang^b ; ^{flmyaya2008@163.com" class="auth_mail" title="E-mail the corresponding author} ; Bo Chen^b ; ^{chenbo_58@163.com" class="auth_mail" title="E-mail the corresponding author} ; Duanwei He^a ; ^{duanweihe@scu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Zriconium tungstate ; Negative thermal expansion ; Phase transition ; High-pressure ; Metal matrix composites (MMCs) ; Thermal properties
• 刊名：Physica B: Physics of Condensed Matter
• 出版年：2016
• 出版时间：15 April 2016
• 年：2016
• 卷：487
• 期：Complete
• 页码：37-41
• 全文大小：1613 K

文摘

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 °C, the thermal conductivity and CTE of the ZrW₂O₈/Cu composites have been determined directly to 165 W/(m k) and 6.8×10⁻⁶ 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.