TY - JOUR
T1 - Effects of interfacial segregation on wetting of PbBiSrCaCuO ceramic by Ag and Ag-based alloys
AU - Froumin, N.
AU - Baram, J.
AU - Polak, M.
N1 - Funding Information:
The authors wish to expresst heir gratitude for the financial support granted by the Israeli Ministry of Absorption and the Israeli Ministry of Science.
PY - 1994/1/1
Y1 - 1994/1/1
N2 - Wettability measurements of PbBiSrCaCuO (PbBiSCO) ceramic by liquid silver and AgCu, AgPb and AgBi alloys and AES analysis of relevant surfaces in these systems are reported. Alloying is shown to promote wettability, the lowest contact angle, 18°, has been measured for Ag-4 at% Cu, compared to 78° for pure Ag. Data analysis has been done in terms of a model that includes effects of elemental segregation on the interfacial energies of the alloy/ceramic and alloy/gas interfaces. The different role of Cu, as compared to Bi or Pb, has been deduced, and confirmed by AES. In particular, dissolution of the ceramic elemental constituents occurs in the drops, and both Bi and Pb segregate at the drop surfaces. Cu, on the other hand, was found to accumulate at a distinct narrow zone surrounding the drops, and presumably segregates also at the liquid/solid interface.
AB - Wettability measurements of PbBiSrCaCuO (PbBiSCO) ceramic by liquid silver and AgCu, AgPb and AgBi alloys and AES analysis of relevant surfaces in these systems are reported. Alloying is shown to promote wettability, the lowest contact angle, 18°, has been measured for Ag-4 at% Cu, compared to 78° for pure Ag. Data analysis has been done in terms of a model that includes effects of elemental segregation on the interfacial energies of the alloy/ceramic and alloy/gas interfaces. The different role of Cu, as compared to Bi or Pb, has been deduced, and confirmed by AES. In particular, dissolution of the ceramic elemental constituents occurs in the drops, and both Bi and Pb segregate at the drop surfaces. Cu, on the other hand, was found to accumulate at a distinct narrow zone surrounding the drops, and presumably segregates also at the liquid/solid interface.
UR - http://www.scopus.com/inward/record.url?scp=0028256910&partnerID=8YFLogxK
U2 - 10.1016/0167-577X(94)90226-7
DO - 10.1016/0167-577X(94)90226-7
M3 - Article
AN - SCOPUS:0028256910
SN - 0167-577X
VL - 18
SP - 176
EP - 180
JO - Materials Letters
JF - Materials Letters
IS - 4
ER -