A.V.Babun
Received May 18, 2000
Porous beryllium has been prepared first by sintering of
sprayed beryllium powder with spherically shaped particles. The sintering
mechanism and kinetics have been studied for the pure beryllium spherical
particles as well as for beryllium and magnesium powders mixture.
The sintering process has been stated to met the x5 ~ tau
law in both cases. This law answers to the volume diffusion mechanism.
In an ideal case, the specific feature of that process is the formation
of bridges between particles, while the particle centers are not drawn
closer to one another; this is of importance in preparing porous pieces
having dimensions close to pre-specified ones. The dependences of
beryllium porosity and mechanical properties on the powder particle
size, sintering conditions, and magnesium content. Optimization of
the process parameters allowed to obtain beryllium material having
a porosity about 45 % and compression strength up to 100 MPa.