Thermal conductivity of Ni-Al powder compacts for reaction synthesis

Thermal conductivity of 3Ni-1Al elemental powder compacts was measured usin g a laser-flash method as a function of temperature, compact density and he at treatment. Temperature dependence of thermal conductivity of the compact s is similar to that of pure Ni and Al metals. Heat treatment has a signifi cant effect on the thermal conductivity of the compacts as particles are jo ined together to form Ni solid solution and intermetallic phases on powder surfaces. Fast diffusion on powder surfaces during heat treatment results i n the formation of intermetallic phase zones in the interior of the former Ni particles. (C) 2000 Elsevier Science Ltd. All rights reserved.