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Hot Pressing of Tantalum Carbide With and Without Sintering Additives
Author(s) -
Zhang Xiaohong,
Hilmas Gregory E.,
Fahrenholtz William G.,
Deason Douglas M.
Publication year - 2007
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.1551-2916.2006.01416.x
Subject(s) - tantalum carbide , sintering , relative density , materials science , hot pressing , tantalum , carbide , grain growth , metallurgy , grain size , carbon fibers , pressing , composite material , composite number
Densification of tantalum carbide (TaC) was studied by hot pressing at temperatures ranging from 1900° to 2400°C with and without sintering additives. Without sintering additives, the relative density increased from 75% at 1900°C to 96% at 2400°C. A microstructural examination showed no observable grain growth up to 2300°C. Densification was enhanced with carbon (C) and/or B 4 C additions. TaC with a 0.78 wt% C addition achieved a relative density of 97% at 2300°C. Additions of 0.36 wt% B 4 C or 0.43 wt% B 4 C and 0.13 wt% C increased the relative density to 98% at 2200°C, accompanied by rapid grain growth at 2100°C and higher temperatures.