Porous beryllium materials made from sprayed powders


National Scientific Center "Kharkiv Institute of Physics and Technology", National Academy of Sciences of Ukraine, 1 Academicheskaya St., 61108 Kharkiv, Ukraine

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.

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