Low aluminum levels stabilize the matrix structure of the metal and permit better creep resistance through a nanoscale niobium carbide
based manufacturers, the publication also includes offerings from international manufacturers of finishing products specializing in niobium carbide
, silicon nitride, oligomers, monomers, iron & steel coating paints, wood finishing stains, powder coating, sealants and other chemicals."
In a study by Fuch and Raatz (1997), TiN, titanium aluminum oxide nitride (TiA1ON), and TiC coatings were synthesized on the surface of tungsten carbide (93.5% tungsten carbide [WC], 5% Co, 1.5% tantalum carbide and niobium carbide
[TaC/TaB]) by plasma-assisted chemical vapor deposition for milling laminated particleboard.
The Gibbs free energy of niobium carbide
formation is less than that of calcium carbide formation.
Lieber observed sawtooth titanium carbide nanorods and niobium carbide
ones with a helical structure.
The results of the phase analysis have proved the presence of niobium carbide
and alpha iron (ferrite).
Likewise, several peaks were observed that correspond to crystalline phases such as chromium boron carbide [Cr.sub.3][B.sub.0.4][C.sub.1.6] (JCPDS File # 01-089-25-89), boron carbide [B.sub.13.3] CL 7 (JCPDS File # 01-083-0855), niobium carbide
, [Nb.sub.6][C.sub.5] (JCPDS File # 01-077-0566), iron niobium, [Fe.sub.65][Nb.sub.6.5] (JCPDS File # 01-071-8308), tungsten, W (JCPDS File # 00-001-1203), and a Fe-Cr solid solution (JCPDS File # 00-034-0396).
The typical microstructure of as-cast alloys is an austenite matrix with intergranular eutectic-like primary chromium-rich carbides ([M.sub.7][C.sub.3] and/or [M.sub.23][C.sub.6] types) and niobium carbides
On the background of the makings of the solid solution that single precipitates of the main secondary phases: complex niobium carbides
(spectra 3, 4, Fig.
The results indicated that niobium silicides could be formed at the beginning, which blocked further reactions between carbon and niobium to form niobium carbides
. When the deposition temperature was increased, silicon would diffuse outward, which allowed the formation of niobium carbides