TY - JOUR
T1 - Wettability and transient liquid phase bonding of hafnium diboride composite with Ni-Nb alloys
AU - Saito, Noritaka
AU - Ikeda, Hiroyuki
AU - Yamaoka, Yoshinori
AU - Glaeser, Andreas M.
AU - Nakashima, Kunihiko
PY - 2012/12/1
Y1 - 2012/12/1
N2 - An effective joining strategy suitable for ultrahigh temperature ceramics will have to be developed for their wider application. In the present study, the wetting behavior of molten Ni-Nb alloys that will form during the transient liquid phase (TLP) bonding when a Ni/Nb/Ni interlayer is used to bond a HfB 2 composite processed with MoSi 2 addition was systematically investigated. In addition, a trial TLP bond of HfB 2 composite with a Ni/Nb/Ni interlayer was also performed at 1,500 °C. Pure Ni was found to melt at a temperature well below its normal melting point during the heating period, which is mainly attributed to the interfacial reaction between HfB 2, MoSi2, and the droplet. The contact angles of all Ni-Nb alloys rapidly decreased with time and showed good wetting against HfB 2 composite. Among them, the pure Ni droplet totally disappeared around 1,400 °C during heating. SEM-WDS microstructural analysis on the cross section of the wetting sample revealed that the reaction layer contained multiple intermetallic compounds involving Si, suggesting the reaction with the sintering aid MoSi 2. With the 40 at.% Nb addition, less interfacial reaction at the Ni- Nb alloy/HfB 2 composite interface was observed. Consequently, it was revealed that a well-bonded interface was achieved when HfB 2 composite was bonded using the Ni/Nb/Ni interlayer.
AB - An effective joining strategy suitable for ultrahigh temperature ceramics will have to be developed for their wider application. In the present study, the wetting behavior of molten Ni-Nb alloys that will form during the transient liquid phase (TLP) bonding when a Ni/Nb/Ni interlayer is used to bond a HfB 2 composite processed with MoSi 2 addition was systematically investigated. In addition, a trial TLP bond of HfB 2 composite with a Ni/Nb/Ni interlayer was also performed at 1,500 °C. Pure Ni was found to melt at a temperature well below its normal melting point during the heating period, which is mainly attributed to the interfacial reaction between HfB 2, MoSi2, and the droplet. The contact angles of all Ni-Nb alloys rapidly decreased with time and showed good wetting against HfB 2 composite. Among them, the pure Ni droplet totally disappeared around 1,400 °C during heating. SEM-WDS microstructural analysis on the cross section of the wetting sample revealed that the reaction layer contained multiple intermetallic compounds involving Si, suggesting the reaction with the sintering aid MoSi 2. With the 40 at.% Nb addition, less interfacial reaction at the Ni- Nb alloy/HfB 2 composite interface was observed. Consequently, it was revealed that a well-bonded interface was achieved when HfB 2 composite was bonded using the Ni/Nb/Ni interlayer.
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U2 - 10.1007/s10853-012-6778-3
DO - 10.1007/s10853-012-6778-3
M3 - Article
AN - SCOPUS:84868303911
VL - 47
SP - 8454
EP - 8463
JO - Journal of Materials Science
JF - Journal of Materials Science
SN - 0022-2461
IS - 24
ER -