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Microstructure of Ti(CN)–WC–NbC–Ni Cermets
Author(s) -
Ahn SunYong,
Kim SeongWon,
Kang Shinhoo
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00750.x
Subject(s) - cermet , dissolution , materials science , microstructure , sintering , phase (matter) , metallurgy , solid solution , mineralogy , analytical chemistry (journal) , chemical engineering , ceramic , chemistry , organic chemistry , engineering , chromatography
An investigation of the microstructural evolution and dissolution phenomena in a Ti(C 0.7 N 0.3 )– x WC– y NbC–20Ni system is reported. In Ti(C 0.7 N 0.3 )– y NbC–20Ni systems, a phase separation occurs between the Ti(CN) core and the (Ti,Nb)(CN) rim phases when the system contains >15 wt% NbC. This phase separation results from the increased misfit between the cores and the solid‐solution rim phases with the addition of NbC. Based on data obtained from a previous study and compositional analyses of the rim structure of the Ti(C 0.7 N 0.3 )– y NbC–20Ni system, the average dissolution rates of WC and NbC appear to be approximately the same with respect to that of Ti(CN), under given sintering conditions (1510°C for 1 h). In addition, compositional changes in the rim structure of the Ti(C 0.7 N 0.3 )– x WC– y NbC–20Ni system are compared with those for a Ti(C 0.7 N 0.3 )– x WC–20Ni system to explain the effect of NbC on WC dissolution in the Ti(C 0.7 N 0.3 )–WC–NbC–Ni system. The presence of NbC in the Ti(C 0.7 N 0.3 ) –x WC–20Ni system is found to suppress the dissolution of WC.