Preparation of Negative Thermal Expansion ZrW₂O₈ Powders and Its Application in Polyimide/ZrW₂O₈ Composites

Juan Yang,Yongsen Yang,Qinqin Liu,Guifang Xu and Xiaonong Cheng School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China

摘 要：Negative thermal expansion （NTE） ZrW2O8 powders were prepared by step-by-step solid-state reaction with ZrO2 and WO3 powders. The coefficient of thermal expansion （CTE） of the as-prepared ZrW2O8 was around -5.08×10-6 K-1 at 20–700℃. Different amounts of ZrW2O8 powders were added in BTDA-ODA polyamic acid to form polyimide/ZrW2O8 composites （PI/ZrW2O8）. With the increment of ZrW2O8, experimental results show that ZrW2O8 powders can significantly enhance the thermal stability of the composites, and reduce the thermal expansion. A 50 wt pct ZrW2O8 addition can give rise to a 31% reduction of CTE. It is suggested that the PI/ZrW2O8 composites have potential applications in high performance microelectronic devices.

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