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Carbon Additions to Molybdenum Disilicide: Improved High‐Temperature Mechanical Properties
Author(s) -
Maloy Stuart,
Heuer Arthur H.,
Lewandowski John,
Petrovic John
Publication year - 1991
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.1151-2916.1991.tb06829.x
Subject(s) - materials science , molybdenum disilicide , alloy , fracture toughness , molybdenum , grain boundary , metallurgy , carbon fibers , phase (matter) , microstructure , toughness , grain size , composite material , chemistry , composite number , organic chemistry
C addition (2 wt%) to MoSi 2 acted as a deoxidant, removing the otherwise ubiquitous siliceous grain boundary phase in hot‐pressed samples, and causing formation of SiC and Mo 5 Si 3 C 1 (a variable‐composition Nowotny phase). Both hardness and fracture toughness of the C‐containing alloy were higher than those of the C‐free (and oxygen‐rich) material; more significantly, the fracture toughness of the MoSi 2 + 2% C alloy increased from 5.5 MPa·m 1/2 at 800°C to ∼11.5 MPa·m 1/2 at 1400°C.