A novel processing approach to fabricate aluminum nitride based composites-l

摘要

Typical requirements [1] of materials operating in a high heat flux environment are high thermal conductivity and coefficient of thermal expansion (CTE) which can be tailored to fit the host environment, high operating temperature capability, high mechanical strength, relatively inexpensive and non-toxic materials, low dielectric constant which can be tailored to the application, and low vapour pressure to survive space operating environments. A12O3, SiC, Cu-SiC, Cu-Cr-Hf [2], Cu-Cr-Ag, Cu-A12O3 and Cu-Z [3] systems (where Z=Mo, Nb, W, C) have been proposed for the dissipation of heat on high flux applications. However, current processing techniques such as liquid infiltration and conventional press and sinter powder metallurgy have not been able to successfully meet the density and microstructural requirements and resultant application-relevant properties.