J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (7): 665-668.

• Regular Papers • Previous Articles     Next Articles

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

Juan Yang, Yongsen Yang, Qinqin Liu, Guifang Xu, Xiaonong Cheng   

  1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
  • Received:2009-04-21 Revised:2009-12-07 Online:2010-07-31 Published:2010-07-26
  • Contact: Juan Yang
  • Supported by:

    the National Natural Science Foundation of China (No. 50372027) and the Natural Science Foundation of Jiangsu Province (No. BK2003404)

Abstract:

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°C. 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 signi¯cantly 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.

Key words: Negative thermal expansion, ZrW2O8, Polyimide, Composite, Coefficient of thermal expansion