CELLULAR MATERIALS OBTAINED BY COMPACTION-SINTERING-DISSOLUTION, USED IN THE CONSTRUCTION OF SLIDING BEARINGS

摘要

Materials with cellular structure have impact on modern applications because of their interesting combinations of physical, chemical and mechanical properties such as high rigidity with very low specific mass and increased permeability associated with high thermal conductivity. In the construction of sliding bearings, the metal matrix structure assumes strength functions over the cell body,while the pore 3D interconnection system enables possibility of fluid flow through the cell body. A mixture of bronze powder and powder of NaCl, in predefined ratio, is compacted under adequate pressure. The raw compact material thus obtained, sintered at a temperature close to its melting point in order to obtain a strong bond between the bronze particles and particles of salt dissolved in warm water, acquires the cellular structure. The evolution of density, cell size and macrostructure of the material are analyzed in order to design a process of optimum compaction-sintering-dissolution.