Abstract
The wetting of oxides (Al2O3, ZrO2), nitrides (Si3N4, Sialon, BN, AlN) and carbides (SiC, ZrC, TiC, B4C) and carbon by Ni-Mo alloy (0-40wt%) were determined in N2 atmosphere at 1500°C by sessile drop method. The following results were obtained.
1) In Al2O3/ZrO2-Ni-Mo system, the metal did not wet these oxide plaques. There were no reaction and no bonding were observed.
2) In nitrides-Ni-Mo system, the metal did not wet nitride plaques. Reaction between nitride plaques and metal slightly occurred, but there was no bonding between them.
3) Contact angle of Ni-30 Mo on Si3N4 or sialon plaques in vacuum was≈0°.
4) Contact angle of Ni-Mo containing above 10wt% Mo on TiC and ZrC was≈0°.
Contact angle of Ni-Mo containing above 40wt% Mo on SiC was≈0°.
5) In ZrC-Ni/Ni-Mo system, the following reactions were observed.
ZrC+Ni→NiZr alloy+graphite
ZrC+Mo→MoZr2+Mo2C
ZrC+Mo2C→(Zr, Mo) C
6) In SiC-Ni/Ni-Mo system, the observed reaction were
SiC+Ni→Ni silicide+graphite
SiC+Mo→MoSi2+Mo2C
