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Characterization of porosity of isostatically pressed and sintered nickel‐base powdered metal *
Author(s) -
FUYS R. A.,
CRAIG R. G.,
ASGAR K.
Publication year - 1976
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.1976.tb00947.x
Subject(s) - materials science , sintering , porosity , compaction , porosimetry , ultimate tensile strength , nickel , composite material , particle size , metallurgy , porous medium , chemical engineering , engineering
Summary Characterization of the pore structure of compacted and sintered parts made from a nickel‐base powder was accomplished using the mercury porosimetry method. The theoretical density values for the sintered specimens varied from 56.3 to 96.7% which corresponds to a porosity of 43.7 to 3.3%. A maximum interconnecting median pore diameter of 21 μm resulted from a −80/+ 200 mesh powder compacted at 138 MN/ m 2 and sintered for 2 h at 1250°C. Photomicrographs of the same sample showed that it had a maximum pore diameter of 200 μm. The interconnected pore volume decreased with decreasing particle size of the powder, increasing compaction pressure, and increasing sintering temperature. Mechanical properties of tensile strength, yield strength, elastic modulus and percentage elongation were correlated with the pore structure. Proper selection of particle size, compaction pressure, sintering times and sintering temperatures should permit parts with controlled porosity characteristics to be produced that possess adequate mechanical properties for application as implants.