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High‐Temperature Cermets: I, Compatibility
Author(s) -
MANNING CHARLES R.,
STOOPS ROBERT F.
Publication year - 1968
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.1151-2916.1968.tb11908.x
Subject(s) - carbide , refractory metals , cermet , materials science , ceramic , nitride , refractory (planetary science) , metallurgy , chemical engineering , composite material , layer (electronics) , engineering
The stability of refractory oxides (Y 2 O 3 ,‐stabilized HfO 2 and ZrO 2 , Tho 2 , CeO 2 ), carbides (HfC, NbC, TaC, and ZrC), borides (NbB 2 and TaB 2 ), and HfN was determined in combination with the Groups VIA and VIIA refractory metals and combinations thereof. Thermodynamic calculations were made to predict stability up to 2500°K between the ceramic oxides and carbides in contact with Mo, Re, and W. Reaction studies were conducted between the ceramics and the Groups VIA and VIIA refractory metals in vacuum and in helium to 2750°C. The Mo‐40 wt% Re, Re, and W were stable in contact with the carbides, nitrides, and oxides to 2450°C with two exceptions. These occurred when CeO 2 reacted with W at 1700°C and Mo‐40 wt% Re reacted with WC. The Mo‐40 wt% Re and Re also reacted with the NbB 2 and TaB a above 2200°C to form very hard single‐phase compounds.