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Verdichtung und mechanische Eigenschaften von flüssigphasengesintertem Tantalum
Author(s) -
Filgueira M.,
Pinatti D. G.,
de Holanda J. N. F.,
Gomes U. U.
Publication year - 2009
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.200900510
Subject(s) - sintering , tantalum , materials science , metallurgy , liquid phase , nickel , shrinkage , copper , powder metallurgy , activator (genetics) , composite material , chemistry , biochemistry , physics , gene , thermodynamics
This paper has as main objective to investigate the influence of nickel (Ni), iron (Fe) and copper (Cu) addition on the tantalum (Ta) powder processing, by promoting a liquid phase sintering (LPS). The role of these metals is to lower the Ta sintering temperature, maintaining good densification and mechanical properties. Ni, Fe and Cu 1wt% additions to Ta powder were performed. Samples were cold pressed at 350 MPa. Sintering was carried out at 1300 to 2000 °C, for 1 hour, under a vacuum of 10 ‐6 Pa. Density, linear shrinkage and activation energy were measured and calculated. Hardness and compression tests were also conducted. Ni was the most promissing Ta LPS activator, once it enabled the best results of densification and mechanical properties.